功能：用一個http請求訪問一個遠程頁面
返回：XMLHttpRequest
參數；
(String)url請求地址，
(String)type請求類型("GET","POST")
(String)dataType:從服務器端返回的數據類型("xml","html","script","json")
(Boolean)ifModified:根據Last-Modified header判斷返回內容是否改變
(Number)timeout：請求超時
(Boolean)global:對此次請求是否引起全局的ajax事件出來，默認true
(Function)error:錯誤處理函數
(Function)complete:請求完成後的處理函數
(Object|String)data:發送到服務器端的數據
(String) contentType ：默認"application/x-www-form-urlencoded"
(Boolean) processData ：傳輸到服務器端的數據默認被轉換到query string中以適合默認"application/x-www-form-urlencoded"
方式，如果你想以DOMDocuments方式傳輸數據，就將該選項設爲false
(Boolean)aysnc:是否異步傳輸，默認爲true
(Function)beforeSend:請求前響應函數
例子：
Load and execute a JavaScript file.
[CODE=javascript]$.ajax({
type: "GET",
url: "test.js",
dataType: "script"
});[/CODE]
Save some data to the server and notify the user once its complete.
[CODE=javascript]$.ajax({
type: "POST",
url: "some.php",
data: "name=John&location=Boston",
success: function(msg){
alert( "Data Saved: " + msg );
}
});[/CODE]
jQuery Code
[CODE=javascript]var html = $.ajax({
url: "some.php",
async: false
}).responseText;[/CODE]
jQuery Code
[CODE=javascript]var xmlDocument = [create xml document];
$.ajax({
url: "page.php",
processData: false,
data: xmlDocument,
success: handleResponse
});[/CODE]
函數：$.ajaxSetup(settings),$.ajaxTimeout(time)
功能：設定請求的一些參數
返回:undefined
例子：
[CODE=javascript]$.ajaxSetup( {
url: "/xmlhttp/",
global: false,
type: "POST"
});
$.ajaxTimeout( 5000 );
[/CODE]
函數：$.get(url, params, callback),$.getIfModified(url, params, callback),
$.getJSON(url, params, callback),$.getScript(url, callback)
功能：get方式提交數據
例子：
[CODE=javascript]$.get("test.cgi",
{ name: "John", time: "2pm" },
function(data){
alert("Data Loaded: " + data);
}
);[/CODE]
函數：$.post(url, params, callback)
功能：post方式提交數據
例子：
[CODE=javascript]$.post("test.cgi",
{ name: "John", time: "2pm" },
function(data){
alert("Data Loaded: " + data);
}
);[/CODE]
函數：ajaxComplete(callback),ajaxComplete(callback),ajaxSend(callback)
ajaxStart(callback),ajaxStop(callback),ajaxSuccess(callback)
功能：XMLHttpRequest狀態改變過程中各個響應處理函數
例子：
[CODE=javascript]$("#msg").ajaxComplete(function(request, settings){
$(this).append(" Request Complete.");
});
$("#msg").ajaxSuccess(function(request, settings){
$(this).append(" Successful Request!");
});
$("#loading").ajaxStop(function(){
$(this).hide();
});
$("#msg").ajaxSend(function(request, settings){
$(this).append(" Starting request at " + settings.url + "");
});[/CODE]
函數：load(url, params, callback),loadIfModified(url, params, callback)
功能：加載html內容
返回：jQuery對象
參數：同get和post方式提交
例子：
$("#feeds").load("feeds.html");
Before
Result:
45 feeds found.
[CODE=javascript]$("#feeds").load("feeds.html",
{limit: 25},
function() { alert("The last 25 entries in the feed have been loaded"); }
);[/CODE]
函數：serialize()
功能：將表單元素和值序列化成string
返回：String
例子：
$("input[@type=text]").serialize();
Before
Result
name=John&location=Boston