1.constructor
<script type="text/javascript">
function Person(){
}
Person.prototype.name = "lisi";
Person.prototype.age = 20;
var person1 = new Person();
alert(person1.constructor);//輸出相應的構造函數
</script>
<script type="text/javascript">
function Person(){
}
Person.prototype = {//這裏是重寫了原型,這樣構造函數指向就出現了問題,需要手動去修正
constructor:Person,
name:"lisi",
age:20
}
var person1 = new Person();
alert(person1.constructor);
</script>
2.jQuery對象轉爲dom對象
<script type="text/javascript">
console.log($("li"));//jQuery.fn.init[3],每個li都有對應的下標
$("li")[1].style.background = "#f00";//$("li")[1]這樣可以把jQuery轉化爲dom對象
</script>
3.merge
<script type="text/javascript">
$(function(){
var arr1 = ['a','b'];
var arr2 = ['c','d'];
var arr3 = {
0:'a',
1:'b',
length:2
};
//$.merge用來合併數組
console.log($.merge(arr1,arr2));//["a", "b", "c", "d"]
//$.merge也可以用來合併json
//merge在jQuery中可以用來合併json
console.log($.merge(arr3,arr2));//Object {0: "a", 1: "b", 2: "c", 3: "d", length: 4}
});
</script>
4.parseHTML
jQuery.parseHTML用來將字符串轉化爲數組,返回一個數組。
<script type="text/javascript">
$(function(){
var str = '<li>1</li><li>2</li><li>3</li>';
var arr = jQuery.parseHTML(str);
console.log(arr);//[li, li, li]
$.each(arr,function(i){
$("ul").append(arr[i]);
});
});
</script>
5.單標籤操作
var li=$('<li>',{title:'hi',html:'abcd'}).appendTo('ul');
//單標籤操作,li的title爲hi,html內容爲abcd,添加到ul中