javascript小技巧-js小技巧收集

每一項都是js中的小技巧，但十分的實用！
1.document.write(""); 輸出語句
2.JS中的註釋爲//
3.傳統的HTML文檔順序是:document->html->(head,body)
4.一個瀏覽器窗口中的DOM順序是:window->(navigator,screen,history,location,document)
5.得到表單中元素的名稱和值:document.getElementById("表單中元素的ID號").name(或value)
6.一個小寫轉大寫的JS: document.getElementById("output").value = document.getElementById("i
nput").value.toUpperCase();
7.JS中的值類型:String,Number,Boolean,Null,Object,Function
8.JS中的字符型轉換成數值型:parseInt(),parseFloat()
9.JS中的數字轉換成字符型:(""+變量)
10.JS中的取字符串長度是:(length)
11.JS中的字符與字符相連接使用+號.
12.JS中的比較操作符有:==等於,!=不等於,>,>=,<.<=
13.JS中聲明變量使用:var來進行聲明
14.JS中的判斷語句結構:if(condition){}else{}
15.JS中的循環結構:for([initial e­xpression];[condition];[upadte e­xpression]) {inside loop}
16.循環中止的命令是:break
17.JS中的函數定義:function functionName([parameter],...)
18.當文件中出現多個form表單時.可以用document.forms[0],document.forms[1]來代替.
19.窗口:打開窗口window.open(), 關閉一個窗口:window.close(), 窗口本身:self
20.狀態欄的設置:window.status="字符";
21.彈出提示信息:window.alert("字符");
22.彈出確認框:window.confirm();
23.彈出輸入提示框:window.prompt();
24.指定當前顯示鏈接的位置:window.location.href="URL"
25.取出窗體中的所有表單的數量:document.forms.length
26.關閉文檔的輸出流:document.close();
27.字符串追加連接符:+=
28.創建一個文檔元素:document.createElement(),document.createTextNode()
29.得到元素的方法:document.getElementById()
30.設置表單中所有文本型的成員的值爲空:
var form = window.document.forms[0]
for (var i = 0; i if (form.elements.type == "text"){
form.elements.value = "";
}
}
31.複選按鈕在JS中判斷是否選中:document.forms[0].checkThis.checked (checked屬性代表爲是否選中
返回TRUE或FALSE)
32.單選按鈕組(單選按鈕的名稱必須相同):取單選按鈕組的長度document.forms[0].groupName.length
33.單選按鈕組判斷是否被選中也是用checked.
34.下拉列表框的值:document.forms[0].selectName.options[n].value (n有時用下拉列表框名稱加上.sel
ectedIndex來確定被選中的值)
35.字符串的定義:var myString = new String("This is lightsword");
36.字符串轉成大寫:string.toUpperCase(); 字符串轉成小寫:string.toLowerCase();
37.返回字符串2在字符串1中出現的位置:String1.indexOf("String2")!=-1則說明沒找到.
38.取字符串中指定位置的一個字符:StringA.charAt(9);
39.取出字符串中指定起點和終點的子字符串:stringA.substring(2,6);
40.數學函數:Math.PI(返回圓周率),Math.SQRT2(返回開方),Math.max(value1,value2)返回兩個數中的最
在值,Math.pow(value1,10)返回value1的十次方,Math.round(value1)四捨五入函數,Math.floor(Math.ra
ndom()*(n+1))返回隨機數
41.定義日期型變量:var today = new Date();
42.日期函數列表:dateObj.getTime()得到時間,dateObj.getYear()得到年份,dateObj.getFullYear()得到
四位的年份,dateObj.getMonth()得到月份,dateObj.getDate()得到日,dateObj.getDay()得到日期幾,dat
eObj.getHours()得到小時,dateObj.getMinutes()得到分,dateObj.getSeconds()得到秒,dateObj.setTi
me(value)設置時間,dateObj.setYear(val)設置年,dateObj.setMonth(val)設置月,dateObj.setDate(va
l)設置日,dateObj.setDay(val)設置星期幾,dateObj.setHours設置小時,dateObj.setMinutes(val)設置分,
dateObj.setSeconds(val)設置秒 [注意:此日期時間從0開始計]
43.FRAME的表示方式: [window.]frames[n].ObjFuncVarName,frames["frameName"].ObjFuncVarN
ame,frameName.ObjFuncVarName
44.parent代表父親對象,top代表最頂端對象
45.打開子窗口的父窗口爲:opener
46.表示當前所屬的位置:this
47.當在超鏈接中調用JS函數時用:(javascript :)來開頭後面加函數名
48.在老的瀏覽器中不執行此JS:
49.引用一個文件式的JS:
50.指定在不支持腳本的瀏覽器顯示的HTML:
51.當超鏈和onCLICK事件都有時,則老版本的瀏覽器轉向a.html,否則轉向b.html.例:dfsadf
52.JS的內建對象有:Array,Boolean,Date,Error,EvalError,Function,Math,Number,Object,RangeError,
ReferenceError,RegExp,String,SyntaxError,TypeError,URIError
53.JS中的換行:/n
54.窗口全屏大小:
55.JS中的all代表其下層的全部元素
56.JS中的焦點順序:document.getElementByid("表單元素").tabIndex = 1
57.innerHTML的值是表單元素的值:如
"how are you"

,則innerHTML的值就是:how are you
58.innerTEXT的值和上面的一樣,只不過不會把這種標記顯示出來.
59.contentEditable可設置元素是否可被修改,isContentEditable返回是否可修改的狀態.
60.isDisabled判斷是否爲禁止狀態.disabled設置禁止狀態
61.length取得長度,返回整型數值
62.addBehavior()是一種JS調用的外部函數文件其擴展名爲.htc
63.window.focus()使當前的窗口在所有窗口之前.
64.blur()指失去焦點.與FOCUS()相反.
65.select()指元素爲選中狀態.
66.防止用戶對文本框中輸入文本:onfocus="this.blur()"
67.取出該元素在頁面中出現的數量:document.all.tags("div(或其它HTML標記符)").length
68.JS中分爲兩種窗體輸出:模態和非模態.window.showModaldialog(),window.showModeless()
69.狀態欄文字的設置:window.status='文字',默認的狀態欄文字設置:window.defaultStatus = '文字.';
70.添加到收藏夾:external.AddFavorite("http://www.dannyg.com/"t;,"jaskdlf");
71.JS中遇到腳本錯誤時不做任何操作:window.onerror = doNothing; 指定錯誤句柄的語法爲:window.on
error = handleError;
72.JS中指定當前打開窗口的父窗口:window.opener,支持opener.opener...的多重繼續.
73.JS中的self指的是當前的窗口
74.JS中狀態欄顯示內容:window.status="內容"
75.JS中的top指的是框架集中最頂層的框架
76.JS中關閉當前的窗口:window.close();
77.JS中提出是否確認的框:if(confirm("Are you sure?"))else{alert("Not Ok");}
78.JS中的窗口重定向:window.navigate("http://www.sina.com.cn/"t;);
79.JS中的打印:window.print()
80.JS中的提示輸入框:window.prompt("message","defaultReply");
81.JS中的窗口滾動條:window.scroll(x,y)
82.JS中的窗口滾動到位置:window.scrollby
83.JS中設置時間間隔:setInterval("expr",msecDelay)或setInterval(funcRef,msecDelay)或setTimeou
t
84.JS中的模態顯示在IE4+行,在NN中不行:showModalDialog("URL"[,arguments][,features]);
85.JS中的退出之前使用的句柄:function verifyClose(){event.returnValue="we really like you and ho
pe you will stay longer.";}} window.onbeforeunload=verifyClose;
86.當窗體第一次調用時使用的文件句柄:onload()
87.當窗體關閉時調用的文件句柄:onunload()
88.window.location的屬性: protocol(http:),hostname(example.com),port(80),host(e
xample.com:80),pathname("/a/a.html"),hash("#giantGizmo",指跳轉到相應的錨記),href(全部的信
息)
89.window.location.reload()刷新當前頁面.
90.window.history.back()返回上一頁,window.history.forward()返回下一頁,window.history.go(返回
第幾頁,也可以使用訪問過的URL)
91.document.write()不換行的輸出,document.writeln()換行輸出
92.document.body.noWrap=true;防止鏈接文字折行.
93.變量名.charAt(第幾位),取該變量的第幾位的字符.
94."abc".charCodeAt(第幾個),返回第幾個字符的ASCii碼值.
95.字符串連接:string.concat(string2),或用+=進行連接
96.變量.indexOf("字符",起始位置),返回第一個出現的位置(從0開始計算)
97.string.lastIndexOf(searchString[,startIndex])最後一次出現的位置.
98.string.match(regExpression),判斷字符是否匹配.
99.string.replace(regExpression,replaceString)替換現有字符串.
100.string.split(分隔符)返回一個數組存儲值.
101.string.substr(start[,length])取從第幾位到指定長度的字符串.
102.string.toLowerCase()使字符串全部變爲小寫.
103.string.toUpperCase()使全部字符變爲大寫.
104.parseInt(string[,radix(代表進制)])強制轉換成整型.
105.parseFloat(string[,radix])強制轉換成浮點型.
106.isNaN(變量):測試是否爲數值型.
107.定義常量的關鍵字:const,定義變量的關鍵字:var
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javascript38種小技巧，推薦新手查看。
事件源對象
event.srcElement.tagName
event.srcElement.type
捕獲釋放
event.srcElement.setCapture();
event.srcElement.releaseCapture();
事件按鍵
event.keyCode
event.shiftKey
event.altKey
event.ctrlKey
事件返回值
event.returnValue
鼠標位置
event.x
event.y
窗體活動元素
document.activeElement
綁定事件
document.captureEvents(Event.KEYDOWN);
訪問窗體元素
document.all("txt").focus();
document.all("txt").select();
窗體命令
document.execCommand
窗體COOKIE
document.cookie
菜單事件
document.oncontextmenu
創建元素
document.createElement("SPAN");
根據鼠標獲得元素：
document.elementFromPoint(event.x,event.y).tagName=="TD
document.elementFromPoint(event.x,event.y).appendChild(ms)
窗體圖片
document.images[索引]
窗體事件綁定
document.onmousedown=scrollwindow;
元素
document.窗體.elements[索引]
對象綁定事件
document.all.xxx.detachEvent('onclick',a);
插件數目
navigator.plugins
取變量類型
typeof($js_libpath) == "undefined"
下拉框
下拉框.options[索引]
下拉框.options.length
查找對象
document.getElementsByName("r1");
document.getElementById(id);
定時
timer=setInterval('scrollwindow()',delay);
clearInterval(timer);
UNCODE編碼
escape() ,unescape
父對象
obj.parentElement(dhtml)
obj.parentNode(dom)
交換表的行
TableID.moveRow(2,1) document.all.csss.href = "a.css";
替換CSS

並排顯示
display:inline
隱藏焦點
hidefocus=true
根據寬度換行
style="word-break:break-all"
自動刷新
<meta HTTP-EQUIV="refresh" CONTENT="8;URL=http://c98.yeah.net">
簡單郵件
<a href="mailto:[email protected]?subject=ccc&body=xxxyyy">
快速轉到位置
obj.scrollIntoView(true)
錨
<a name="first">
<a href="#first">anchors</a>
網頁傳遞參數
location.search();
可編輯
obj.contenteditable=true
執行菜單命令
obj.execCommand
雙字節字符
/[^/x00-/xff]/
漢字
/[/u4e00-/u9fa5]/
讓英文字符串超出表格寬度自動換行
word-wrap: break-word; word-break: break-all;
透明背景
<IFRAME src="1.htm" width=300 height=180 allowtransparency></iframe>
獲得style內容
obj.style.cssText
HTML標籤
document.documentElement.innerHTML
第一個style標籤
document.styleSheets[0]
style標籤裏的第一個樣式
document.styleSheets[0].rules[0]
防止點擊空鏈接時，頁面往往重置到頁首端。
<a href="javascript:function()">word</a>
上一網頁源
asp:
request.servervariables("HTTP_REFERER")
javascript:
document.referrer
釋放內存
CollectGarbage();
禁止右鍵
document.oncontextmenu = function() { return false;}
禁止保存
<noscript><iframe src="*.htm"></iframe></noscript>
禁止選取<body oncontextmenu="return false" ondragstart="return false" onselectstart ="return false" onselect="document.selection.empty()" oncopy="document.selection.empty()" onbeforecopy="return false"onmouseup="document.selection.empty()>
禁止粘貼
<input type=text onpaste="return false">
地址欄圖標
<link rel="Shortcut Icon" href="favicon.ico">
favicon.ico 名字最好不變16*16的16色,放虛擬目錄根目錄下
收藏欄圖標
<link rel="Bookmark" href="favicon.ico">
查看源碼
<input type=button value=查看網頁源代碼 onclick="window.location = 'view-source:'+ 'http://www.csdn.net/'">
關閉輸入法
<input style="ime-mode:disabled">
自動全選
<input type=text name=text1 value="123" onfocus="this.select()">
ENTER鍵可以讓光標移到下一個輸入框
<input onkeydown="if(event.keyCode==13)event.keyCode=9">
文本框的默認值
<input type=text value="123" onfocus="alert(this.defaultValue)">
title換行
obj.title = "123 sdfs "
獲得時間所代表的微秒
var n1 = new Date("2004-10-10".replace(/-/g, "//")).getTime()
窗口是否關閉
win.closed
checkbox扁平
<input type=checkbox style="position: absolute; clip:rect(5px 15px 15px 5px)"><br>
獲取選中內容
document.selection.createRange().duplicate().text
自動完成功能
<input type=text autocomplete=on>打開該功能
<input type=text autocomplete=off>關閉該功能
窗口最大化
<body onload="window.resizeTo(window.screen.width - 4,window.screen.height-50);window.moveTo(-4,-4)">
無關閉按鈕IE
window.open("aa.htm", "meizz", "fullscreen=7");
統一編碼/解碼
alert(decodeURIComponent(encodeURIComponent("http://你好.com?as= hehe")))
encodeURIComponent對":"、"/"、";" 和 "?"也編碼
表格行指示
<tr onmouseover="this.bgColor='#f0f0f0'" onmouseout="this.bgColor='#ffffff'">
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核心(Core) Javascript 學習手記

核心(Core) Javascript 學習手記

linenum

CreateD BY STABX, AT 2006-9-5.

Javascript Notes By shawl.qiu

---/-------------------------------------------------------------

-3.1 函數比其他代碼優先執行
-3. 優先級
-2.4 同時初始化多個變量並賦相同值
-2.3 在函數中使用 var 定義一個變量, 該變量將影響整個函數, 不分先後.
-2.2 全局變量與局部變量
-2.1.2 普通定義變量 2
-2.1.1 普通定義變量 1
-2.1 普通定義變量
-2. var 定義變量
-1.5 in 操作符
-1.4.2 true 等價 1, false 等價 0.
-1.4 == 與 ===
-1.4.1 NaN
-1.3 0/0=?
-1.2 類型轉換
-1.1 -- 與 ++
-1.1.1
-1. 運算符

0. 語法
0.1 Switch

1. 按鈕
1.1 前進後退按鈕
1.2 確認按鈕
1.3 最原始也最實用的 UBB 代碼輸入方法——SCRIPT & FORM
1.4 Prompt
1.5.1 鼠標經過時選中，並隱藏原框的文字， 移開再顯示文字 ——文本框
1.5 鼠標經過時選中 ——複選框 Focus()
1.6 鼠標經過自動提交表單

2. 接收鍵盤事件
2.1 按任何鍵關閉窗口
2.2 實時顯示更改的圖片鏈接

3. 數組/Array
3.1 Javascript 結合 Asp 使用數組

4. 控制圖片大小

5. 雙擊拷貝文本

6. IE 全屏顯示

7. 文本框回車鏈接

8. 顯示頁面所有元素

9. 正則表達式

10. 接收鼠標事件
10.1 單擊鼠標右擊關閉窗口 (我用左手)
10.2 鼠標移過選擇表單項

11. 字符串
11.1 檢測字符串中是否出現某字符

12. 隨機數
12.1.1 生成 GUID 2
12.1 生成 GUID

13. 時間操作
13.1 以毫秒爲單位的倒計時跳轉, 來源 CSDN

14. switch
14.1 簡單 switch
15 if 判斷
15.1.2 簡單 if 判斷 3
15.1.1 簡單 if 判斷 2
15.1 簡單 if 判斷
15.2 if 判斷的 三個 寫法
15.3 判斷執行文件使用網絡還是使用本地協議
15.4 if...else 寫法

16. 簡單 while

16. while

17. do while
17.1.2 簡單 do while
17.1 簡單 do while

18. for
18.1 簡單 for
18.2 簡單 for 1
18.3 循環列出從 a - z 的字母
18.3 n階乘
18.4 Fibonacci Numbers

19. for in
19.1.1 簡單 for in 1
19.1 簡單 for in
19.2.1 for in 賦值 [數組] 1
19.2 for in 賦值 [數組]

20. try, catch, finally
20.1.1 簡單 try, catch 1
20.1 簡單 try, catch

21. with
21.1 簡單with (另一寫法)
21.1 簡單 with

22. break, continue
22.1 continue
22.2.1 break 標籤
22.2 break

23. call, apply
23.1.1 找出數組中最大的數
23.1 apply

24. object
24.1.1 創建簡單對象 一
24.1.2 創建簡單對象 二
24.1 創建簡單對象
24.2.1 創建嵌套對象 1
24.2 創建嵌套對象
24.3 刪除對象中的屬性
24.4.1 遍歷對象中的屬性名 1
24.4 遍歷對象中的屬性名
24.5 obj.propertyIsEnumerable('ele')
24.6 obj.hasOwnProperty('ele')

25. toString
25.1 使用 toString 列出數組中的元素

26. Array()
26.0.1 簡單創建數組, 並賦值 2
26.0 簡單創建數組, 並賦值
26.0.3 創建數組中的數組
26.0.4 創建數組中的對象
26.0.2 簡單創建數組
26.1 [array].push(), [array].pop()
26.2 數組排序
26.3 創建數組指定維數, 從 1 開始.

27. RegExp
27.1 普通操作 1
27.2 test 語句
27.3 exec 語句

28. new 語法

29. isNaN

30. Date()
30.1 輸出年月日, 時分秒 的日期格式

31. function 函數
31.1.1.1 三種定義函數的方法 1.1
31.10 在數組中存儲函數, 並引用
31.1.1 三種定義函數的方法 1
31.1.2 三種定義函數的方法 2
31.1 三種定義函數的方法
31.2 在標籤中寫函數
31.3 創建嵌套函數
31.4.1 創建遞歸函數 1
31.4 創建遞歸函數
31.5 創建 函數對象
31.6 在函數內部定義的函數只能在該函數內部調用
31.7 定義函數變量, 並賦值
31.8 變量引用函數
31.9 在對象中存儲函數, 並引用
31.11 function.call()
31.12 在函數內定義的變量可以被下級內嵌函數調用

32. typeof 查看數據類型
32.1

33. obj.valueOf() 返回原始值

34. Math 對象
34.1.1 生成 1 至 4 的隨機數
34.1 Math.random();
34.2 求 x 的 n 次方

35. delete

36. confirm() 確認框
36.1 帶條件確認框

37. window.open

37. window
37.1 打開沒有焦點的窗口

38. return 返回值
38.1 return true
38.2 return undefined

39. throw
39.1 簡單產生錯誤

40. arguments
40.1 判斷 arguments.length
40.2 列出所有 argument 的值
40.3 arguments.callee / 調用函數本身

41. .to******
41.1 toString

42. parseInt() / parseFolat()

--------------------------------

42. parseInt() / parseFolat()
<script type="text/javascript">
//<![CDATA[
var str='1.1322 this test ';
document.write(('str like this: ').bold()+str.fontcolor('red')+'<br/>');
document.write(('parseInt(str): ').bold()+parseInt(str)+'<br/>');
document.write(('parseFloat(str): ').bold()+parseFloat(str)+'<br/>');

document.write(('parseInt(1111,2): ').bold()+parseInt(1111,2)+'<br/>');
document.write(('parseInt(1111,8): ').bold()+parseInt(1111,8)+'<br/>');
document.write(('parseInt(1111): ').bold()+parseInt(1111)+'<br/>');
document.write(('parseInt(1111,16): ').bold()+parseInt(1111,16)+'<br/>');
//]]>
</script>

41. .to******
<script type="text/javascript">
//<![CDATA[
var num=12345.6789

document.write(('parseInt(num): ').bold()+parseInt(num)+'<br/>');

document.write(('num.toFixed(0): ').bold()+num.toFixed(0)+'<br/>');
document.write(('num.toFixed(2): ').bold()+num.toFixed(2)+'<br/>');

document.write(('num.toExponential(2): ').bold()+num.toExponential(2)+'<br/>');
document.write(('num.toExponential(1): ').bold()+num.toExponential(1)+'<br/>');

document.write(('num.toPrecision(1): ').bold()+num.toPrecision(1)+'<br/>');
document.write(('num.toPrecision(2): ').bold()+num.toPrecision(2)+'<br/>');

//]]>
</script>

41.1 toString
<script type="text/javascript">
//<![CDATA[
var num=123456789

document.write(('num.toString(): ').bold()+num.toString()+'<br/>');
document.write(('num.toString(2): ').bold()+num.toString(2)+'<br/>');
document.write(("'0'+num.toString(8): ").bold()+'0'+num.toString(8)+'<br/>');
document.write(("'0x'+num.toString(16): ").bold()+'0x'+num.toString(16)+'<br/>');

//]]>
</script>



40. arguments

40.1 判斷 arguments.length
<script type="text/javascript">
//<![CDATA[
function t(a, b, c, d){
if(arguments.length!=4)document.write(('error! argument must be 4 element.').fontcolor('red')+' current arguments length: '+arguments.length+'<br/>');
else document.write(('this right: '+arguments.length).bold()+' arguments<br/>');
}
t();
t('a', 'b', 'c', 'd');
t('a', 'b', 'c', 'd', 'e');
//]]>
</script>

40.2 列出所有 argument 的值
<script type="text/javascript">
//<![CDATA[
function t(){
for(var i=0; i<arguments.length; i++){
document.write(('arguments['+i+']').bold()+' = '+arguments[i].fontcolor('red')+'<br/>');
}
}
var temp='test';
t('aaa', 'bbb', 'ccc', 'ddd', 'eee', temp);
//]]>
</script>

40.3 arguments.callee / 調用函數本身
<script type="text/javascript">
//<![CDATA[
var t=function(x){
document.write(x+'<br/>');
if(x>1){
arguments.callee(x-1);
}
}
t(10);
//]]>
</script>

39. throw

39.1 簡單產生錯誤
<script type="text/javascript">
//<![CDATA[
t(10);
t();

function t(x){
if(typeof x==='undefined')throw new Error('x must be own a value');
document.write(x);
}
//]]>
</script>

38. return 返回值

38.1 return true
<script type="text/javascript">
//<![CDATA[
function t(ipt){
window.status=ipt;
return true;
}
t('test this');
//]]>
</script>

38.2 return undefined
<script type="text/javascript">
//<![CDATA[
function t(t){
if(t==null)return;
}
document.write(t()); // undefined
//]]>
</script>

37. window

37. window.open

37.1 打開沒有焦點的窗口
<script type="text/javascript">
//<![CDATA[
var w=window.open('/')
w.blur();
window.focus();
//]]>
</script>

36. confirm() 確認框

36.1 帶條件確認框
<script type="text/javascript">
//<![CDATA[
var x=confirm('what doing with you')
if(x){alert('ok')}else alert('good choice');
//]]>
</script>

35. delete
<script type="text/javascript">
//<![CDATA[
var t={i:'ok', j:'ok too'}
document.write(delete t.i); // true
document.write('<br/>');
document.write(delete t); // false 不能刪除 使用 var 定義的變量或對象
document.write('<br/>');
document.write(delete n); // true 刪除不存在的元素.
document.write('<br/>');
document.write(delete j); // true
document.write('<br/>');
//]]>
</script>

34. Math 對象

34.1 Math.random();

34.1.1 生成 1 至 4 的隨機數
<script type="text/javascript">
//<![CDATA[
document.write(parseInt(Math.random()*4+1)+'<br/>');
//]]>
</script>

34.2 求 x 的 n 次方
<script type="text/javascript">
//<![CDATA[
document.write(Math.pow(2,10));
//]]>
</script>

33. obj.valueOf() 返回原始值
<script type="text/javascript">
//<![CDATA[
var a=1, b='test', c=false, d=new Object();
document.write(a.valueOf()+'<br/>'); // 1
document.write(b.valueOf()+'<br/>'); // test
document.write(c.valueOf()+'<br/>'); // false
document.write(d.valueOf()+'<br/>'); // [object Object]
//]]>
</script>

32. typeof 查看數據類型
<script type="text/javascript">
//<![CDATA[
var a=['a', 'b', 'c']
document.write(typeof a); // object
document.write(a.valueOf()); // a, b, c
document.write(typeof null); // object
//]]>
</script>

32.1
<script type="text/javascript">
//<![CDATA[
var a=['a', 'b', 'c']
document.write(typeof a); // object
document.write(a.valueOf()); // a, b, c
//]]>
</script>

31. function 函數

31.1 三種定義函數的方法
<script type="text/javascript">
//<![CDATA[
function f(){ alert('function f');};
var f1=function(){ alert('function f1');};
var f2=new Function('', "alert('function f2')");
f(); f1(); f2();
//]]>
</script>

31.1.1 三種定義函數的方法 1
<script type="text/javascript">
//<![CDATA[
var t=new Function('a', 'b', 'return a+b;')
document.write(t('ok ', 'test this'));
//]]>
</script>

31.1.1.1 三種定義函數的方法 1.1
<script type="text/javascript">
//<![CDATA[
var t=new Function("return 'test this'")
document.write(t());
//]]>
</script>

31.1.2 三種定義函數的方法 2
<script type="text/javascript">
//<![CDATA[
var t=function(str){return 'this test'+str};

document.write(t(', right.'));
//]]>
</script>

31.2 在標籤中寫函數
<div onclick="javascript:var go=function(){alert(111)};go();">div 可用</div>
<div onclick="go()">div1 不可用</div>
<div onclick="javascript:( function(){alert(111);} )()">div2 可用</div>
<div onclick="javascript:function go(){alert(111);}go();">div3 可用</div>

31.3 創建嵌套函數
<script type="text/javascript">
//<![CDATA[
function level1(){
var lNm='level 1'
document.write(lNm+'<br/>');
function level2(){
var lNm='level 2'
document.write(lNm+'<br/>');
}
level2();
}
level1();
//]]>
</script>

31.4 創建遞歸函數
<%
var i=0;
function t(){
i++;
if(i<100){
Response.Write(i+'<br/>');
return t();
}
Response.Write(i+'<br/>');
}
t();
%>

31.4.1 創建遞歸函數 1
<script type="text/javascript">
//<![CDATA[
function fctr(n){
if(n<=1)return 1;
return n*fctr(n-1);
}
document.write(fctr(4));
//]]>
</script>

31.5 創建 函數對象
<script type="text/javascript">
//<![CDATA[
function fT(){
this.title='o test';
this.subtitle=fTt();
function fTt(){
return 'o subtitle';
}
}
var t=new fT();
document.write(t.title+'<br/>');
document.write(t.subtitle+'<br/>');
t=null;
//]]>
</script>

31.6 在函數內部定義的函數只能在該函數內部調用
<script type="text/javascript">
//<![CDATA[
function lev1(){
document.write('lev 1<br/>');
function lev2(){
document.write('lev 2<br/>');
}
lev2();
}
lev1();
lev2(); // 出錯, 在函數內部定義的函數只能在該函數內部調用

//]]>
</script>

31.7 定義函數變量, 並賦值
<script type="text/javascript">
//<![CDATA[
var t=(function(str){return str+str+'<br/>';})('test this ')
document.write(t);
//]]>
</script>

31.8 變量引用函數
<script type="text/javascript">
//<![CDATA[
function t(x){
x+='';
return x+x;
}
document.write(t('how fun ')+'<br>'); // how fun how fun
var u=t // u 引用 函數 t
document.write(u('how fun too ')+'<br>'); // how fun too how fun too
//]]>
</script>

31.9 在對象中存儲函數, 並引用
<script type="text/javascript">
//<![CDATA[
var o=new Object();
o.t=function(x){x+=''; return x+x;}
var t=o.t('test this ');
document.write(t);
//]]>
</script>

31.10 在數組中存儲函數, 並引用
<script type="text/javascript">
//<![CDATA[
var a=new Array(3);
a[0]=function(x){x+='';return x+x};
a[1]='test this ';
a[2]=a[0](a[1]);
document.write(a[2]);
//]]>
</script>

31.11 function.call()
<script type="text/javascript">
//<![CDATA[
var o=new Object();
function f(a, b){
return a+b
}
document.write(f.call(o, 1, 2));
//]]>
</script>

31.12 在函數內定義的變量可以被下級內嵌函數調用
<script type="text/javascript">
//<![CDATA[
function t(){
var x=" this's test ";
function u(){
document.write(x.bold());
}
u();
}
t();
//]]>
</script>

30. Date()

30.1 輸出年月日, 時分秒 的日期格式
<script type="text/javascript">
//<![CDATA[
var $dt=new Date();
document.write('yyyy-nn-dd: '+$dt.toLocaleDateString()+'<br/>');
document.write('hh-mm-ss: '+$dt.toLocaleTimeString());
//]]>
</script>

29. isNaN
<script type="text/javascript">
//<![CDATA[
var $str='this is string';
var $num=12.3;
//alert(isNaN($str));
alert(isNaN($num));
//]]>
</script>

28. new 語法
new Boolean(false)
new Number(0)
new String("")
new Array()
new Object()
new Date();
new Error();

27. RegExp

27.1 普通操作 1
<script type="text/javascript">
//<![CDATA[
var $str='this is a test'
with(document){
write('test str is: '+$str+'<br/>');
write('$str.search(/is a/i): '+$str.search(/is a/i)+'<p/>');

write('$str.replace(/ {1,1}/ig,"--"): '+$str.replace(/ {1,1}/ig,"--")+'<p/>');

write('$str.match(/t[/S]{1,3}/ig): '+$str.match(/t[/S]{1,3}/ig)+'<p/>');

var $temp=$str.match(/(t[/S]{1,3})/ig)
for ($i=0; $i<$temp.length; $i++){
write($temp[$i]+'<br/>');
}
}
//]]>
</script>

27.2 test 語句
<script type="text/javascript">
//<![CDATA[
var $pattern=/this/i;
alert($pattern.test('this is a test'));
//]]>
</script>

27.3 exec 語句
<script type="text/javascript">
//<![CDATA[
var $pattern=/this/ig;
var $str='this is a test, this is repeat';
var $result;
while(($result=$pattern.exec($str))!=null){
alert($result[0]+'>>> index of str: '+$result.index+' $pattern lastIndex: '+$pattern.lastIndex);
}
//]]>
</script>

26. Array()

26.0 簡單創建數組, 並賦值
<script type="text/javascript">
//<![CDATA[
var ar=new Array();
for(var i=0; i<10; i++){
ar[i]='array '+i
document.write(ar[i]+'<br/>');
}
//]]>
</script>

26.0.1 簡單創建數組, 並賦值 2
<script type="text/javascript">
//<![CDATA[
var ar=['v1', 'v2', 'v3', 'v4', 'v5']
for(var i=0; i<ar.length; i++){
document.write(ar[i]+'<br/>');
}
//]]>
</script>

26.0.2 簡單創建數組
<script type="text/javascript">
//<![CDATA[
var ar=new Array(10);
document.write(ar.length);
//]]>
</script>

26.0.3 創建數組中的數組
<script type="text/javascript">
//<![CDATA[
var ar=new Array('v1', 'v2', 'v3', ['v41', 'v42']);
for(var i=0; i<ar.length; i++){
document.write(ar[i].toString()+'<br/>');
}
//]]>
</script>

26.0.4 創建數組中的對象
<script type="text/javascript">
//<![CDATA[
var ar=new Array('v1', 'v2', 'v3', {x:'v41', y:'v42'});
for(var i=0; i<ar.length; i++){
if(typeof(ar[i])=='string')
document.write(ar[i]+'<br/>');
else if(typeof(ar[i])=='object'){
document.write('object<br/>');
for(var j in ar[i]){
document.write('obj: '+j+' obj val '+ar[i][j]+'<br/>');
}
}
}
//]]>
</script>

26.1 [array].push(), [array].pop()
<script type="text/javascript">
//<![CDATA[
var $array=new Array('a', 'b', 'c', 'd', 'e')

with(document){
write('source $array.join: '+$array.join()+'<br/>');
write ($array.length+'<br/>');
$array.push(1,1,1,1,1,1,1,1,1,1);
write ('$array.push(1,1,1,1,1,1,1,1,1,1), $array.length: '+$array.length+'<br/>');
write('join $array: '+$array.join()+'<p/>');

write ($array.length+'<br/>');
$array.push(1, 2, 3, 4, 5);
write ('$array.push(1, 2, 3, 4, 5), $array.length: '+$array.length+'<br/>');
write('join $array: '+$array.join()+'<p/>');

write('$array.pop(): '+$array.pop()+'<br/>');
write('$array.length & $array.join(): '+$array.length+' '+$array.join()+'<p/>');

write('$array.pop(10): '+$array.pop(10)+'<br/>');
write('$array.length & $array.join(): '+$array.length+' '+$array.join()+'<br/>');
}
//]]>
</script>

26.2 數組排序
<script type="text/javascript">
//<![CDATA[
var a=new Array();
for (var i=0, j=1; i<10;a[i]=j, i++, j++);

document.write('<h2>未排序前:</h2>');
document.write(a.join());

document.write('<h2>無條件排序:</h2>');
document.write(a.sort().join());

temp=a.sort(function(a, b){return a-b});
document.write('<h2>a-b 排序:</h2>');
document.write(temp.join());

temp=a.sort(function(a, b){return b-a});
document.write('<h2>b-a 排序:</h2>');
document.write(temp.join());
//]]>
</script>

26.3 創建數組指定維數, 從 1 開始.
<script type="text/javascript">
//<![CDATA[
var a=new Array(3);
document.write((a.length+'').bold()+'<br/>');
for(var i=0; i<a.length; i++){
document.write(i+'<br/>');
}
//]]>
</script>

25. toString

25.1 使用 toString 列出數組中的元素
<script type="text/javascript">
//<![CDATA[
var $array=new Array('a', 'a1', 'a2');
alert($array.toString());
//]]>
</script>

24. object

24.1 創建簡單對象
<script type="text/javascript">
//<![CDATA[
var $obj=new Object();
$obj={$title:"object example", $date:Date()}
alert($obj.$date);
//]]>
</script>

24.1.1 創建簡單對象 一
<script type="text/javascript">
//<![CDATA[
var cnt=new Object();
cnt.title='title this';
cnt.content='content this'
cnt.date='the publishing date of '+Date();

document.write('title: '+cnt.title+'<br/>cnt.content: '+cnt.content+'<br/>cnt.date: '+cnt.date);
//]]>
</script>

24.1.2 創建簡單對象 二
<script type="text/javascript">
//<![CDATA[
var cnt={
title:'title this',
content:'content this',
date:'the publishing date of '+Date()
}
document.write('title: '+cnt.title+'<br/>cnt.content: '+cnt.content+'<br/>cnt.date: '+cnt.date);
//]]>
</script>

24.2 創建嵌套對象
<script type="text/javascript">
//<![CDATA[
var cnt={
title:{
headertitle:'header title',
subtitle:'subtitle this'
},
content:'content this',
date:'the publishing date of '+new Date().toLocaleString()
}
document.write('title: '+cnt.title.headertitle.bold().fontcolor('red')+
'<br/>cnt.title.subtitle: '+cnt.title.subtitle.fontcolor('blue')+
'<br/>cnt.content: '+cnt.content.fontcolor('goldenrod')+
'<br/>cnt.date: '+cnt.date);
//]]>
</script>

24.2.1 創建嵌套對象 1
<script type="text/javascript">
//<![CDATA[
var o=new Object();
o.title=' this title ';
o.content=' this content';
o.lve=new Object();
o.lve.title=' this o.lve title';
o.lve.content=' this o.lve content';

document.write('o.title: '+o.title.bold()+'<br/>');
document.write('o.content: '+o.content.bold()+'<br/>');
document.write('o.lve.title: '+o.lve.title.bold()+'<br/>');
document.write('o.lve.content: '+o.lve.content.bold()+'<br/>');
//]]>
</script>

24.3 刪除對象中的屬性
<script type="text/javascript">
//<![CDATA[
var $obj=new Object();
$obj={$title:"object example", $date:Date()}
//alert($obj.$date);

var $name="";
for(name in $obj)$name+=name+'/n';
alert($name);

delete $obj.$date

var $name="";
for(name in $obj)$name+=name+'/n';
alert($name);
//]]>
</script>

24.4 遍歷對象中的屬性名
<script type="text/javascript">
//<![CDATA[
var $obj=new Object();
$obj={$title:"object example", $date:Date()}
//alert($obj.$date);

var $name="";
for(name in $obj)$name+=name+'/n';
alert($name);
//]]>
</script>

24.4.1 遍歷對象中的屬性名 1
<script type="text/javascript">
//<![CDATA[
var o=new Object();
o.title=' this title ';
o.content=' this content';
o.lve=new Object();
o.lve.title=' this o.lve title';
o.lve.content=' this o.lve content';

for (var i in o){
if(typeof o[i]!=='object'){
document.write('object o, element: '+i.fontcolor('red')+' value: '+o[i].bold()+'<br/>');
} else {
document.write('object '+i+' element<br/>');
for(var j in o[i]){
document.write('subobject element :'+j.fontcolor('red')+
' subobject value: '+o[i][j].bold()+'<br/>');
}
}
}
//]]>
</script>

24.5 obj.propertyIsEnumerable('ele')
<script type="text/javascript">
//<![CDATA[
var d=new Date();
d.x='test';
var s=new String();
var o=new Object();
var f=new Function('thest')

document.write(d.propertyIsEnumerable('x'));
document.write(d.propertyIsEnumerable('y'));
//]]>
</script>

24.6 obj.hasOwnProperty('ele')
<script type="text/javascript">
//<![CDATA[
var d=new Date();
d.x='test';
var s=new String();
var o=new Object();
var f=new Function('thest')

document.write(d.hasOwnProperty('x'));
document.write(d.hasOwnProperty('y'));
//]]>
</script>

23. call, apply

23.1 apply

23.1.1 找出數組中最大的數
<script type="text/javascript">
//<![CDATA[
$array=new Array(2, 9, 12, 33, 2, 4444, 22)
var $temp=Math.max.apply(null, $array)
alert($temp)
//]]
</script>

22. break, continue

22.1 continue
<script type="text/javascript">
//<![CDATA[
for (var $i=0; $i<10; $i++){
if($i==5){continue;}
document.write ($i+'<br/>')
}
//]]>
</script>

22.2 break

22.2.1 break 標籤
<script type="text/javascript">
//<![CDATA[
//document.write('<xmp>');
outerloop:
for (var i=0; i<10; i++){
document.writeln(('outerloop:'+i).bold()+'<br/>')
innerloop:
for(var j=0; j<10; j++){;
if(i==5)break outerloop;
if(j==9)break innerloop;
document.writeln(('innerloop: '+j).fontcolor('blue')+'<br/>');
}
}
//document.write('</xmp>');
//]]>
</script>

21. with

21.1 簡單 with
<script type="text/javascript">
//<![CDATA[
with(document){
write('ok');
}
//]]>
</script>

21.1 簡單with (另一寫法)
var $dw=document
$dw.write('ok this a test');

20. try, catch, finally

20.1 簡單 try, catch
try{
5*kkk
}
catch(e){
alert(e)
}

20.1.1 簡單 try, catch 1
<script type="text/javascript">
//<![CDATA[
document.write('<h2>window object:</h2>');
for(var i in window){
try{
document.write(i.bold()+' '+(window[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
//]]>
</script>

19. for in

19.1 簡單 for in
<script type="text/javascript">
//<![CDATA[
/* document.write('<h2>top object:</h2>');
for(var i in top){
try{
document.write(i.bold()+' '+(top[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}

document.write('<h2>parent object:</h2>');
for(var i in parent){
try{
document.write(i.bold()+' '+(parent[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}

document.write('<h2>screen object:</h2>');
for(var i in screen){
try{
document.write(i.bold()+' '+(screen[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
*/
try{
document.write('<h2>clipboardData object:</h2>');
for(var i in clipboardData){
try{
document.write(i.bold()+' '+(clipboardData[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
} catch(ex) {
document.write((ex+'').fontcolor('red'));
}

document.write('<h2>window object:</h2>');
for(var i in window){
try{
document.write(i.bold()+' '+(window[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
/*
document.write('<h2>Option object:</h2>');
for(var i in Option){
try{
document.write(i.bold()+' '+(Option[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
*/
document.write('<h2>frames object:</h2>');
for(var i in frames){
try{
document.write(i.bold()+' '+(frames[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
/*
document.write('<h2>self object:</h2>');
for(var i in self){
try{
document.write(i.bold()+' '+(self[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
*/
document.write('<h2>document object:</h2>');
for(var i in document){
document.write(i.bold()+' '+(document[i]+'').fontcolor('blue')+'<br/>');
}

document.write('<h2>history object:</h2>');
for(var i in history){
try{
document.write(i.bold()+' '+(history[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
/*
document.write('<h2>Image object:</h2>');
for(var i in Image){
try{
document.write(i.bold()+' '+(Image[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}
*/
document.write('<h2>navigator object:</h2>');
for(var i in navigator){
try{
document.write(i.bold()+' '+(navigator[i]+'').fontcolor('blue')+'<br/>');
} catch (e) {
document.write(i.fontcolor('red').bold()+': ');
document.write(e.description.fontcolor('red')+'<br/>');
}
}

document.write('<h2>location object:</h2>');
for(var i in location){
document.write(i.bold()+' '+(location[i]+'').fontcolor('blue')+'<br/>');
}
//]]>
</script>

19.1.1 簡單 for in 1
for (var $i in window){
document.write($i+'<br/>');
}

19.2 for in 賦值 [數組]
var $array=new Array();
var i=0;
for ($array[i++] in window){
//document.write($i+'<br/>');
}
alert($array[0]);

19.2.1 for in 賦值 [數組] 1
<script type="text/javascript">
//<![CDATA[
var o={a:'aaa', b:'bbb', c:'ccc'};
var a=new Array();
var i=0;
for(a[i++] in o)document.write(a[i-1]);
//for(i in a)document.write(a[i]);
//]]>
</script>

18. for

18.1 簡單 for
for (var $i=0; $i<10; $i++) {
document.write($i)
}

18.2 簡單 for 1
for (var $i=0, $j=10; $i<10; $i++, $j--) {
document.write(($i*$j)+'<br/>')
}

18.3 循環列出從 a - z 的字母
<script type="text/javascript">
//<![CDATA[
for(var $i='a'.charCodeAt(); $i<='z'.charCodeAt(); $i++){
document.write(String.fromCharCode($i)+'<br/>')
}
//]]>
</script>

18.3 n階乘
<script type="text/javascript">
//<![CDATA[
var $fN=10
for (var $i=1, $j=1; $i<=$fN; $i++, $j*=$i){
if($i==$fN){document.write($j);}
}
//]]>
</script>

18.4 Fibonacci Numbers
<script type="text/javascript">
//<![CDATA[
for(var $i=0, $j=1, $k=0, $fbcc=0; $i<50; $i++){
document.write($i+'='+$fbcc+'<br/>');
$fbcc=$j+$k;
$j=$k;
$k=$fbcc;
}
//]]>
</script>

17. do while

17.1 簡單 do while
var $count=0
do{
document.write($count)
} while(++$count<10)

17.1.2 簡單 do while
var $count=1
do{
document.write($count)
} while($count++<10)

16. while

16. 簡單 while
var $count=0
while($count<10){ document.write($count);$count++;}

15 if 判斷

15.1 簡單 if 判斷
function ubbTag(fId, str){
document.getElementById(fId).content.focus();
var strEnd=str.replace(//[/ig,'[/')
if (strEnd.indexOf('=')>-1){ strEnd=strEnd.replace(/(.*?)/=.*?/]/,'$1]') }
if((document.selection)&&(document.selection.type== "Text")){
var oStr=document.selection.createRange();
oStr.text=str+oStr.text+strEnd
} else {
document.getElementById(fId).content.value+=str+strEnd
}
}

15.1.1 簡單 if 判斷 2
<script type="text/javascript">
//<![CDATA[
var i=0, j=1;
i>j?j+=i:i+=j;
document.write(i+' '+j);
//]]>
</script>

15.1.2 簡單 if 判斷 3
<script type="text/javascript">
//<![CDATA[
if(!cdti||cdti=='')var cdti='test this';
document.write(cdti);
//]]>
</script>

15.2 if 判斷的 三個 寫法
<script type="text/javascript">
//<![CDATA[
var a=b=5, c=6
if(a==b)document.write('a equal b <br/>');
(a==b)&&document.write('a equal b <br/>');
a==b?document.write('a equal b <br/>'):'';
//]]>
</script>

15.3 判斷執行文件使用網絡還是使用本地協議
<script type="text/javascript">
//<![CDATA[
if(location.protocol=='file:'){
alert('local')
} else alert('internet');
//]]>
</script>

15.4 if...else 寫法
<script type="text/javascript">
//<![CDATA[
//var i=0
var i=1
if(i==0)document.write('i=0');
else document.write('i!=0');
//]]>
</script>

14. switch

14.1 簡單 switch
/* switch(strEnd){
case '/[//html]' :strEnd=strEnd.replace(///[//,'HTML 和 JS 代碼支持[');break;
case '/[//code]' :strEnd=strEnd.replace(///[//,'代碼[');break;
case '/[//quote]' :strEnd=strEnd.replace(///[//,'引用[');break;
case '/[//cite]' :strEnd=strEnd.replace(///[//,'引用[');break;
case '/[//linenum]' :strEnd=strEnd.replace(///[//,'顯示行號[');break;
case '/[//b]' :strEnd=strEnd.replace(///[//,'粗體[');break;
case '/[//i]' :strEnd=strEnd.replace(///[//,'敘體[');break;
case '/[//u]' :strEnd=strEnd.replace(///[//,'下劃線[');break;
case '/[//flash]' :strEnd=strEnd.replace(///[//,'Flash 動畫[');break;
case '/[//sound]' :strEnd=strEnd.replace(///[//,'背景聲音[');break;
case '/[//mms]' :strEnd=strEnd.replace(///[//,'WM格式流數據[');break;
case '/[//rtsp]' :strEnd=strEnd.replace(///[//,'Real格式流數據[');break;
case '/[//ra]' :strEnd=strEnd.replace(///[//,'在線Real Player播放音頻文件[');break;
case '/[//real]' :strEnd=strEnd.replace(///[//,'Real Player 播放視頻文件[');break;
case '/[//wm]' :strEnd=strEnd.replace(///[//,'在線Windows Media Player播放視頻文件[');break;
case '/[//wma]' :strEnd=strEnd.replace(///[//,'在線Windows Media Player播放音頻文件[');break;
case '/[//iframe]' :strEnd=strEnd.replace(///[//,'插入網頁[');break;
} */

13. 時間操作

13.1 以毫秒爲單位的倒計時跳轉, 來源 CSDN
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript">
//<![CDATA[
var go=20000;
var timer=null;
var endTime = new Date().getTime() + go ;
function interval()
{
var n=(endTime-new Date().getTime())/1000;
if(n<0) return;
document.getElementById("jumpTo").innerHTML = n.toFixed(3);
setTimeout(interval, 10);
}
window.onload=function(){
timer=setTimeout("window.location.href='/'", go);
interval();
}
//]]>
</script>
<span id="jumpTo">20.000</span> 秒後 將自動</span>跳轉到

12. 隨機數

12.1 生成 GUID
<!--start 12.1-->
<html>
<!-- DW6 -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
<script>
function fGuid()
{
var g ="";
for(var i = 0; i < 32; i++)
g += Math.floor(Math.random() * 0xF).toString(0xF) + (i == 8 || i == 12 || i == 16 || i == 20 ? "-" : "");
alert(g.toUpperCase());
}
</script>
</head>
<body onLoad="fGuid();">
</body>
</html>
<!--end 12.1-->

12.1.1 生成 GUID 2
<!--start 12.1.1 -->
<html>
<!-- DW6 -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
<script>
function fGuid() {
var g ="";
for(var i = 0; i < 32; i++)
g += Math.floor(Math.random() * 0xF).toString(0xF) + (i == 8 || i == 12 || i == 16 || i == 20 ? "-" : "");
//alert(g.toUpperCase());
return g.toUpperCase();
}
</script>
</head>
<body>
<form name="form1" method="post" action="">
<input name="textfield" type="text" onMouseMove="this.value=fGuid();" size="50">
</form>
</body>
</html>
<!--end 12.1.1 -->

11.1 檢測字符串中是否出現某字符
<script>
function test(str) {
if(str.indexOf("|")>0) {
alert("have |")
}
}
</script>
<input type="text" value="kklskldflksd|ksdkfksjd" onMouseOver="test(this.value)" />

11. 字符串

10.2 鼠標移過選擇表單項
onMouseOver="focus();select();"

10.1 單擊鼠標右擊關閉窗口 (我用左手)
<html onmousedown='window.close();'>

10. 接收鼠標事件

9. 正則表達式
function rbr() {
re=//<br///>*/ig
document.all.textarea.value=document.all.textarea.value.replace(re,"")
}

8. 顯示頁面所有元素
<script language="JavaScript" type="text/javascript">
//<![CDATA[
for(var i in document) {
document.write(i +"="+ document[i]+"<br/>")
}
//]]>
</script>

7. 文本框回車鏈接
<script>
<!--
function ckKeyPress(jumpto){
if(window.event.keyCode==13) {
window.location.href="?"+jumpto
}
}
//-->shawl.qiu script
</script>
轉到:<input type='text' onmousemove='this.focus();this.select();' onkeypress="ckKeyPress(this.value);" />

6. IE 全屏顯示
<script language="JavaScript">
<!--
self.moveTo(0,0)
self.resizeTo(screen.availWidth,screen.availHeight)
//-->
</script>

5. 雙擊拷貝文本
<script LANGUAGE="JAVASCRIPT">
function ClipBoard(tdObj) { //IE Only
var holdtext = document.all['holdtext'];
holdtext.innerText = tdObj.innerText;
Copied = holdtext.createTextRange();
Copied.execCommand("Copy");
alert("text copied");
}
</script>
<form NAME="form1" METHOD="post" ACTION="">
<textarea id="holdtext" style="display:none" ROWS="10"></textarea>
</form>

4. 控制圖片大小
<img src="images/teach/opera/01.jpg" onload="javascript:if(this.width>500)this.width=500;" >
//如果圖片寬度大於 500px, 則 更改寬度爲 500px

3.1 Javascript 結合 Asp 使用數組
<% '連接數據庫
set rs=server.CreateObject("adodb.recordset") '創建 rs 數據查詢
rs.open "Select a.*, b.* FROM ctglossarysubcat AS a INNER JOIN ctglossarysupercat AS b ON a.gcid = b.gcid order by a.gcid",MM_conn_string,1
%>
<script LANGUAGE="JAVASCRIPT">
var onecount; //定義子類計數
onecount=0; //設置子類計數默認值爲0
subcat = new Array(); //定義顯示子類數組
<% count = 0
do while not rs.eof %>
subcat[<%=count%>] = new Array("<%=rs("gscat")%>","<%=rs("a.gcid")%>","<%=rs("gscid")%>");
<% count = count + 1
rs.movenext
loop
%>
onecount=<%=count%>; //子類條目總數
</script>
<%
rs.close '關閉 rs 連接
set rs=nothing
%>

3. 數組/Array

2.2 實時顯示更改的圖片鏈接
<input type="text" name="" value="<%response.write siteicon %>" onkeyup="javascript:document.all.siteicon.src=(this.value);" /> <img src="<%response.write siteicon %>" alt="<%response.write sitename %>" id="siteicon" />

2.1 按任何鍵關閉窗口
<body onKeyPress="self.close()">

2. 接收鍵盤事件

1.6 鼠標經過自動提交表單
onMouseOut="submit()"

1.5.1 鼠標經過時選中，並隱藏原框的文字， 移開再顯示文字 ——文本框
<input NAME="findtext" TYPE="text" ID="findtext" value="查找" onMouseOver="this.focus();this.value=''" onMouseOut="this.value='查找';this.select()">
<!-- shawl.qiu script -->


1.5 鼠標經過時選中 ——複選框 Focus()
<input type="checkbox" onMouseOver="checked='true'" />
<!-- shawl.qiu script -->

1.4 Prompt
function prompter()
{

urlLink=window.prompt("請輸入鏈接"," http://")
text = window.prompt("鏈接名")

if(text!="")
document.formT.content.value+=""+text+""
}


1.3 最原始也最實用的 UBB 代碼輸入方法——SCRIPT & FORM
<form name="formT" id="formT" method="post" action="">
<input type="button" value="url" onclick="this.form.content.value+=''"/>
<input type="button" value="code" onclick="this.form.content.value+='
CODE:'" />

<input type="button" value="quote" onclick="this.form.content.value+='
QUOTE:

'"/>
<br />
<textarea name="content" cols="60" rows="10"></textarea>
<br />
<input type="submit" name="Submit" value="Submit" />
<input type="reset" name="Reset" value="Reset" />
</form>
<!-- shawl.qiu script -->

1.2 確認按鈕
<script LANGUAGE="JavaScript">
<!--//確認框, 注意表單名; 按鈕屬性, 按鈕名字不能爲 submit
function confirmer()
{
if (confirm("現在提交?")) {
document.formT.submit()
}
else {
document.formT.reset()
}
}gggg
//Script By Shawl.qiu
//-->
</script>
<form name="formT" method="post" action="t1.asp">
<input type="text" name="textfield" value="確認後提交">
<input type="button" name="confbuton" value="提交" onclick="confirmer();">
</form>


1.1 前進後退按鈕
<input TYPE="button" VALUE="後退" ONCLICK="history.back(-1)">
<input TYPE="button" VALUE="前進" ONCLICK="history.back(+1)">

1. 按鈕

0. 語法

0.1 Switch
function kP() {
switch(event.keyCode) {
case 27: //按 ESC 鍵關閉窗口.
window.close()
break;
//case 120: //F9 轉到主頁
//window.location.href="/"
//break;
default:
break;
}
}

-1. 運算符

-1.1 -- 與 ++
<script type="text/javascript">
//<![CDATA[
var x;
x=0;
document.write('x=0, x++: '+(x++)); // 執行 x 後, x 再加 1
x=0;
document.write('<br/>x=0, ++x: '+(++x)); // 執行 x 前, x 先加 1
x=2;
document.write('<br/>x=2, x--: '+(x--)); // 執行 x 後, x 再減 1
x=2;
document.write('<br/>x=2, --x: '+(--x)); // 執行 x 前, x 先減 1
//]]>
</script>

-1.1.1
<script type="text/javascript">
//<![CDATA[
var i=1;
j=++i;
document.write(i); //2
document.write('<br/>');
document.write(j); //2
document.write('<br/>');

var k=1
l=k++
document.write(k); //2
document.write('<br/>');
document.write(l); //1
//]]>
</script>

-1.2 類型轉換
<script type="text/javascript">
//<![CDATA[
document.write('100'+100); //'100100' 字符串與數字相加
document.write('<br/>');
document.write('100'-0); //100 轉字符串爲數值
document.write('<br/>');
document.write(100+''); //'100' 數值轉字符串
document.write('<br/>');
document.write(!!100); //true 轉布爾值
document.write('<br/>');
document.write(!100); //false 轉布爾值
document.write('<br/>');
//]]>
</script>

-1.3 0/0=?
<script type="text/javascript">
//<![CDATA[
document.write(0/0); //NaN
//]]>
</script>

-1.4 == 與 ===

-1.4.1 NaN
<script type="text/javascript">
//<![CDATA[
document.write(NaN==NaN); //false
document.write(NaN===NaN); //false
//]]>
</script>

-1.4.2 true 等價 1, false 等價 0.
<script type="text/javascript">
//<![CDATA[
document.write(1==true); //true
document.write('<br/>');
document.write(0==false); //true
document.write('<br/>');
//]]>
</script>

-1.5 in 操作符
<script type="text/javascript">
//<![CDATA[
var o={e:'ok', f:'ok'}
document.write('e' in o); // true
document.write('<br/>');
document.write('f' in o); // true
document.write('<br/>');
document.write('j' in o); // false
document.write('<br/>');
document.write('toString' in o); // false
document.write('<br/>');
//]]>
</script>

-2. var 定義變量

-2.1 普通定義變量
<script type="text/javascript">
//<![CDATA[
var i
document.write(i+'<br/>');
var j=1, k=2
document.write(j+k+'<br/>');
for(var l=0; l<10; l++)document.write(l+' ');;
//]]>
</script>

-2.1.1 普通定義變量 1
<script type="text/javascript">
//<![CDATA[
var o={a:'aaa', b:'bbb', c:'ccc'}
for(var i in o){
document.write('object element name: '+i.bold()+' object value: '+o[i].fontcolor('blue')+'<br/>');
}
//]]>
</script>

-2.1.2 普通定義變量 2
<script type="text/javascript">
//<![CDATA[
var i=j=k=l='ok';
document.write(i.bold()+'<br/>');
document.write(j.bold()+'<br/>');
document.write(k.bold()+'<br/>');
document.write(l.bold()+'<br/>');
//]]>
</script>

-2.2 全局變量與局部變量
<script type="text/javascript">
//<![CDATA[
var i='global i';//全局
function t(){
var i='local i'; //局部
document.write(i+'<br/>');
j='global j' //全局
document.write(j+'<br/>');
}
document.write(i+'<br/>');
t();
document.write(i+'<br/>');
document.write(j+'<br/>');

var k='global k'
document.write(k+'<br/>');
function t1(){
k='change global k'
document.write(k+'<br/>');
}
t1();
document.write(k+'<br/>');
//]]>
</script>

-2.3 在函數中使用 var 定義一個變量, 該變量將影響整個函數, 不分先後.
var scope = "global";
function f( ) {
alert(scope); // Displays "undefined", not "global"
var scope = "local"; // Variable initialized here, but defined everywhere
alert(scope); // Displays "local"
}
f( );

-2.4 同時初始化多個變量並賦相同值
<script type="text/javascript">
//<![CDATA[
var i=j=k=l=0;
document.write(i+' '+j+' '+k+' '+l+' ');
//]]>
</script>

-3. 優先級

-3.1 函數比其他代碼優先執行
<script type="text/javascript">
//<![CDATA[
document.write((t(10)+'').bold()+'<br/>');
t=10;
document.write((t+'').bold()+'<br/>');
function t(n){
return n*n;
}
//]]>
</script>

---/---------------------------------------------------------

常用參數

3. document

2. location

1. this

---------------------------------

3.3 寫出字符串
document.write("<input type='button' value='url' onclick='addcontent('','');'/>");

3.2 document.from
指定 表單域

3.1 document.all.id
查找指定 HTML 頁面 ID 或 名字

3. document

2.2 轉到特定網頁
onClick="location.href=' http://127.0.0.1/'"

2.1 單獨 location
取頁面地址

2. location

1.4 this.height
取高度屬性

1.3 this.width
取寬度屬性

1.2 this.href
取鏈接地址

1.1 this.src
取圖片地址

1. this

---/---------------------------------------------------------

問題集:

3. return 返回多個值 2006-10-14 14:13:18

2. 理解 setInternal 用法

1. 理解 void 用法

---/---------------------------------------------------------

相關摘要:

24. Keep in mind that the function statement is available in all versions of JavaScript, the Function( ) constructor is available only in JavaScript 1.1 and later, and function literals are available only in JavaScript 1.2 and later. Recall that we said the three functions defined earlier are "more or less" equivalent -- there are some differences between these three techniques for function definition, which we'll consider in Section 11.5.

//JavaScript: The Definitive Guide, 4th Edition -- 7.1.3 Function Literals
2006-10-19 14:35:56

23. The Function( ) constructor expects any number of string arguments. The last argument is the body of the function -- it can contain arbitrary JavaScript statements, separated from each other by semicolons. All other arguments to the constructor are strings that specify the names of the parameters to the function being defined. If you are defining a function that takes no arguments, you simply pass a single string -- the function body -- to the constructor.

//JavaScript: The Definitive Guide, 4th Edition -- 7.1.2 The Function( ) Constructor
2006-10-19 14:16:18

22. Note that ECMAScript v3 does not allow function definitions to appear anywhere; they are still restricted to top-level global code and top-level function code. This means that function definitions may not appear within loops or conditionals, for example.[1] These restrictions on function definitions apply only to function declarations with the function statement. As we'll discuss later in this chapter, function literals (another feature introduced in JavaScript 1.2 and standardized by ECMAScript v3) may appear within any JavaScript e­xpression, which means that they can appear within if and other statements.

//JavaScript: The Definitive Guide, 4th Edition -- 7.1 Defining and Invoking Functions
2006-10-19 14:10:13

21. try and finally can be used together without a catch clause. In this case, the finally block is simply cleanup code that is guaranteed to be executed, regardless of any break, continue, or return statements within the try clause. For example, the following code uses a try/finally statement to ensure that a loop counter variable is incremented at the end of each iteration, even when an iteration terminates abruptly because of a continue statement:

//JavaScript: The Definitive Guide, 4th Edition -- 6.17 try/catch/finally
2006-10-18 19:18:08

20. The continue statement, in both its labeled and unlabeled forms, can be used only within the body of a while, do/while, for, or for/in loop. Using it anywhere else causes a syntax error.

//JavaScript: The Definitive Guide, 4th Edition -- 6.12 continue
2006-10-18 16:03:46

19. The following rules are used to determine whether two values are identical according to the === operator:

If the two values have different types, they are not identical.

If both values are numbers and have the same value, they are identical, unless either or both values are NaN, in which case they are not identical. The NaN value is never identical to any other value, including itself! To check whether a value is NaN, use the global isNaN( ) function.

If both values are strings and contain exactly the same characters in the same positions, they are identical. If the strings differ in length or content, they are not identical. Note that in some cases, the Unicode standard allows more than one way to encode the same string. For efficiency, however, JavaScript string comparison compares strictly on a character-by-character basis, and it assumes that all strings have been converted to a "normalized form" before they are compared. See the "String.localeCompare( )" reference page in the core reference section of this book for another way to compare strings.

If both values are the boolean value true or both are the boolean value false, they are identical.

If both values refer to the same object, array, or function, they are identical. If they refer to different objects (or arrays or functions) they are not identical, even if both objects have identical properties or both arrays have identical elements.

If both values are null or both values are undefined, they are identical.

The following rules are used to determine whether two values are equal according to the == operator:

If the two values have the same type, test them for identity. If the values are identical, they are equal; if they are not identical, they are not equal.

If the two values do not have the same type, they may still be equal. Use the following rules and type conversions to check for equality:

If one value is null and the other is undefined, they are equal.

If one value is a number and the other is a string, convert the string to a number and try the comparison again, using the converted value.

If either value is true, convert it to 1 and try the comparison again. If either value is false, convert it to 0 and try the comparison again.

If one value is an object and the other is a number or string, convert the object to a primitive and try the comparison again. An object is converted to a primitive value by either its toString( ) method or its valueOf( ) method. The built-in classes of core JavaScript attempt valueOf( ) conversion before toString( ) conversion, except for the Date class, which performs toString( ) conversion. Objects that are not part of core JavaScript may convert themselves to primitive values in an implementation-defined way.

Any other combinations of values are not equal.

As an example of testing for equality, consider the comparison:
"1" == true

This e­xpression evaluates to true, indicating that these very different-looking values are in fact equal. The boolean value true is first converted to the number 1, and the comparison is done again. Next, the string "1" is converted to the number 1. Since both numbers are now the same, the comparison returns true.

When the equality operator in JavaScript 1.1 attempted to convert a string to a number and failed, it displayed an error message noting that the string could not be converted, instead of converting the string to NaN and returning false as the result of the comparison. This bug has been fixed in JavaScript 1.2.

//JavaScript: The Definitive Guide, 4th Edition -- 5.4 Equality Operators
2006-10-16 21:56:30

18. In top-level code (i.e., JavaScript code that is not part of a function), you can use the JavaScript keyword this to refer to the global object. Within functions, this has a different use, which is described in Chapter 7.

//JavaScript: The Definitive Guide, 4th Edition -- 4.6 Variables as Properties
2006-10-16 16:08:34

17. Garbage collection is automatic and is invisible to the programmer. You can create all the garbage objects you want, and the system will clean up after you! You need to know only enough about garbage collection to trust that it works; you don't have to wonder about where all the old objects go. For those who aren't satisfied, however, Section 11.3, contains further details on the JavaScript garbage-collection process.

//JavaScript: The Definitive Guide, 4th Edition -- 4.5 Garbage Collection
2006-10-16 16:01:55

16. Primitive Types and Reference Types
var a = [1,2,3]; // Initialize a variable to refer to an array
var b = a; // Copy that reference into a new variable
a[0] = 99; // Modify the array using the original reference
alert(b); // Display the changed array [99,2,3] using the new reference

If this result does not seem surprising to you, you're already well familiar with the distinction between primitive and reference types. If it does seem surprising, take a closer look at the second line. Note that it is the reference to the array value, not the array itself, that is being assigned in this statement. After that second line of code, we still have only one array object; we just happen to have two references to it.

//JavaScript: The Definitive Guide, 4th Edition -- 4.4 Primitive Types and Reference Types

15. 在任何情況下，如果六個月以後您還能毫不費力地閱讀和理解所編寫的代碼，則說明這些代碼寫得不錯。

//Windows 腳本技術 -- JScript -- 什麼是 JScript？
2006-10-16 14:12:55

14. The rule that all variables declared in a function are defined throughout the function can cause surprising results. The following code illustrates this:

var scope = "global";
function f( ) {
alert(scope); // Displays "undefined", not "global"
var scope = "local"; // Variable initialized here, but defined everywhere
alert(scope); // Displays "local"
}
f( );
//JavaScript: The Definitive Guide, 4th Edition -- 4.3 Variable Scope

13. Variable Scope
The scope of a variable is the region of your program in which it is defined. A global variable has global scope -- it is defined everywhere in your JavaScript code. On the other hand, variables declared within a function are defined only within the body of the function. They are local variables and have local scope. Function parameters also count as local variables and are defined only within the body of the function.
Within the body of a function, a local variable takes precedence over a global variable with the same name. If you declare a local variable or function parameter with the same name as a global variable, you effectively hide the global variable. For example, the following code prints the word "local":

var scope = "global"; // Declare a global variable
function checkscope( ) {
var scope = "local"; // Declare a local variable with the same name
document.write(scope); // Use the local variable, not the global one
}
checkscope( ); // Prints "local"

//JavaScript: The Definitive Guide, 4th Edition -- 4.3 Variable Scope
2006-10-16 1:11:59

12. In general, functions do not know what variables are defined in the global scope or what they are being used for. Thus, if a function uses a global variable instead of a local one, it runs the risk of changing a value upon which some other part of the program relies. Fortunately, avoiding this problem is simple: declare all variables with var

//JavaScript: The Definitive Guide, 4th Edition -- 4.3 Variable Scope
2006-10-15 22:23:32

11. If you attempt to read the value of an undeclared variable, JavaScript will generate an error. If you assign a value to a variable that you have not declared with var, JavaScript will implicitly declare that variable for you. Note, however, that implicitly declared variables are always created as global variables, even if they are used within the body of a function. To prevent the creation of a global variable (or the use of an existing global variable) when you meant to create a local variable for use within a single function, you must always use the var statement within function bodies. It's best to use var for all variables, whether global or local. (The distinction between local and global variables is explored in more detail in the next section.)

//JavaScript: The Definitive Guide, 4th Edition -- 4.2.1 Repeated and Omitted Declarations
2006-10-15 22:00:53

10. Error Objects

ECMAScript v3 defines a number of classes that represent errors. The JavaScript interpreter "throws" an object of one of these types when a runtime error occurs. (See the throw and try statements in Chapter 6 for a discussion of throwing and catching errors.) Each error object has a message property that contains an implementation-specific error message. The types of predefined error objects are Error, EvalError, RangeError, ReferenceError, SyntaxError, TypeError, and URIError. You can find out more about these classes in the core reference section of this book.

//JavaScript: The Definitive Guide, 4th Edition -- 3.11 Error Objects
2006-10-15 19:39:08

9. undefined

Another special value used occasionally by JavaScript is the undefined value returned when you use either a variable that has been declared but never had a value assigned to it, or an object property that does not exist. Note that this special undefined value is not the same as null.

Although null and the undefined value are distinct, the == equality operator considers them to be equal to one another. Consider the following:
my.prop == null

//JavaScript: The Definitive Guide, 4th Edition -- 3.8 undefined
2006-10-15 18:02:39

8. The way to really learn a new programming language is to write programs with it.

//JavaScript: The Definitive Guide, 4th Edition -- 1.10 Exploring JavaScript
2006-10-14 2:40:02

7. Both Netscape and Microsoft have made their JavaScript interpreters available to companies and programmers who want to embed them in their applications. Netscape's interpreter was released as open source and is now available through the Mozilla organization (see http://www.mozilla.org/js/). Mozilla actually provides two different versions of the JavaScript 1.5 interpreter. One is written in C and is called "SpiderMonkey." The other is written in Java and, in a flattering reference to this book, is called "Rhino."

//JavaScript: The Definitive Guide, 4th Edition -- 1.4 JavaScript in Other Contexts
2006-10-14 1:13:44

6. 11.1.2 Explicit Type Conversions

Table 11-1 listed the automatic data type conversions that JavaScript performs. It is also possible to explicitly convert values from one type to another. JavaScript does not define a cast operator as C, C++, and Java do, but it does provide similar facilities for converting data values.

As of JavaScript 1.1 (and the ECMA-262 standard), Number( ) , Boolean( ), String( ), and Object( ) may be called as functions as well as being invoked as constructors. When invoked in this way, these functions attempt to convert their arguments to the appropriate type. For example, you could convert any value x to a string with String(x) and convert any value y to an object with Object(y).

There are a few other tricks that can be useful for performing explicit conversions. To convert a value to a string, concatenate it with the empty string:
var x_as_string = x + "";

To force a value to a number, subtract zero from it:
var x_as_number = x - 0;

And to force a value to boolean, use the ! operator twice:
var x_as_boolean = !!x;

Because of JavaScript's tendency to automatically convert data to whatever type is required, explicit conversions are usually unnecessary. They are occasionally helpful, however, and can also be used to make your code clearer and more precise.

//JavaScript: The Definitive Guide, 4th Edition -- 11.1 Data Type Conversion
2006-10-12 12:36:23

5. Each RegExp object has five properties. The source property is a read-only string that contains the text of the regular e­xpression. The global property is a read-only boolean value that specifies whether the regular e­xpression has the g flag. The ignoreCase property is a read-only boolean value that specifies whether the regular e­xpression has the i flag. The multiline property is a read-only boolean value that specifies whether the regular e­xpression has the m flag. The final property is lastIndex, a read-write integer. For patterns with the g flag, this property stores the position in the string at which the next search is to begin. It is used by the exec( ) and test( ) methods, as described in the previous section.

//JavaScript: The Definitive Guide, 4th Edition -- 10.3.2 RegExp Instance Properties
2006-10-9 21:23:26

4. the RegExp constructor. search( ) does not support global searches -- it ignores the g flag of its regular e­xpression argument.

//JavaScript: The Definitive Guide, 4th Edition -- 10.2 String Methods for Pattern Matching
2006-10-9 19:56:40

3. We've seen the . operator used to access the properties of an object. It is also possible to use the [] operator, which is more commonly used with arrays, to access these properties. Thus, the following two JavaScript e­xpressions have the same value:

object.property
object["property"]

//JavaScript: The Definitive Guide, 4th Edition -- 8.6 Objects as Associative Arrays
2006-10-9 14:45:13

2. The typeof Operator

typeof is a unary operator that is placed before its single operand, which can be of any type. Its value is a string indicating the data type of the operand.

The typeof operator evaluates to "number", "string", or "boolean" if its operand is a number, string, or boolean value. It evaluates to "object" for objects, arrays, and (surprisingly) null. It evaluates to "function" for function operands and to "undefined" if the operand is undefined.
//JavaScript: The Definitive Guide, 4th Edition -- 5.10.2 The typeof Operator

1. JavaScript strings (and JavaScript arrays, as we'll see later) are indexed starting with zero.


---/---------------------------------------------------------

小小心得

1. 花括弧定義 對象 元素, 方括弧定義 數組 元素. 2006-10-15 17:55:50

2. Javascript 正則表達式摘要

linenum
Javascript 與正則表達式 By shawl.qiu


語法方法:

5. str.split()
<script type="text/javascript">
//<![CDATA[
var str=' this , is, a, text';
document.write(str.split(//s*,/s*/));
document.write('<br/>');
document.write(str.split(//s*,/s*/).join());
//]]>
</script>

4. str.match()
<script type="text/javascript">
//<![CDATA[
var str=' This is a test. ';
document.write(str.match(//w+/).join());
document.write('<br/>');
document.write(str.match(//w+/g).join());
//]]>
</script>

3. str.replace()
<script type="text/javascript">
//<![CDATA[
var str=' This is a test. ';
document.write(str.replace(/^(/s+)|(/s+)$/,'----------'));
document.write('<br/>');
document.write(str.replace(/^(/s+)|(/s+)$/g,'----------'));
//]]>
</script>

2. str.search()
<script type="text/javascript">
//<![CDATA[
var str=' This is a test. ';
document.write(str.search(/this/i));
//]]>
</script>

1. 子匹配
<script type="text/javascript">
//<![CDATA[
var str=' this is a test '
document.write(str.match(/(is+).*?/1/)[0]);
//]]>
</script>

0. 創建正則表達式模式

0.1 new RegExp()
<script type="text/javascript">
//<![CDATA[
var str=' this is a test '
var re=new RegExp('//w+','g');
document.write(str.match(re));
//]]>
</script>

-1. re.exec(str)
<script type="text/javascript">
//<![CDATA[
var str=' this is a test '
var pt=/this|test/g;

var report
while((report=pt.exec(str))!=null){
document.write(('match: ').bold()+report[0].fontcolor('red')+'<br/>');
document.write(('match index: ').bold()+(report.index+'').fontcolor('red')+'<br/>');
document.write(('match lastIndex: ').bold()+(pt.lastIndex+'').fontcolor('red')+'<p/>');
}
//]]>
</script>

-2. re.test(str)
<script type="text/javascript">
//<![CDATA[
var str=' this is a test ';
var re=//d+/;
document.write(re.test(str));

var re=//w+/;
document.write(re.test(str));
//]]>
</script>

---/----------------------------------------

摘要:

4. The String methods search( ) , replace( ), and match( ) do not use the lastIndex property as exec( ) and test( ) do. In fact, the String methods simply reset lastIndex( ) to 0. If you use exec( ) or test( ) on a pattern that has the g flag set and you are searching multiple strings, you must either find all the matches in each string, so that lastIndex is automatically reset to zero (this happens when the last search fails), or you must explicitly set the lastIndex property to 0 yourself. If you forget to do this, you may start searching a new string at some arbitrary position within the string rather than from the beginning. Finally, remember that this special lastIndex behavior occurs only for regular e­xpressions with the g flag. exec( ) and test( ) ignore the lastIndex property of RegExp objects that do not have the g flag.

//JavaScript: The Definitive Guide, 4th Edition -- 10.3.1 RegExp Methods for Pattern Matching
2006-10-20 18:10:36

3. match method
The match( ) method is the most general of the String regular e­xpression methods. It takes a regular e­xpression as its only argument (or converts its argument to a regular e­xpression by passing it to the RegExp( ) constructor) and returns an array that contains the results of the match. If the regular e­xpression has the g flag set, the method returns an array of all matches that appear in the string. For example:
"1 plus 2 equals 3".match(//d+/g) // returns ["1", "2", "3"]

//JavaScript: The Definitive Guide, 4th Edition -- 10.2 String Methods for Pattern Matching
2006-10-20 17:23:08

2. search method
Strings support four methods that make use of regular e­xpressions. The simplest is search( ). This method takes a regular e­xpression argument and returns either the character position of the start of the first matching substring, or -1 if there is no match. For example, the following call returns 4:
"JavaScript".search(/script/i);

If the argument to search( ) is not a regular e­xpression, it is first converted to one by passing it to the RegExp constructor. search( ) does not support global searches -- it ignores the g flag of its regular e­xpression argument.

//JavaScript: The Definitive Guide, 4th Edition -- 10.2 String Methods for Pattern Matching

1. A number of punctuation characters have special meanings in regular e­xpressions. They are:
^ $ . * + ? = ! : | / / ( ) [ ] { }
//JavaScript: The Definitive Guide, 4th Edition -- 10.1 Defining Regular Expressions