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jquery before()和insertBefore()函式例項

在jquery中,before()和insertBefore()函式都有著一樣的功能,一樣的目的,也就是新增文字或html內容到匹配元素的前面,其主要的區別在於語法上的區別。

例如:

<divclass="prettyBox">I'm a ipman</div>
<divclass="prettyBox">I'm a ipman 2</div>

1 $(‘selector’).before(‘new content’);

$(‘.prettyBox’).before(“<div class=”newPrettybox”>Ironman</div>”);

2 $(‘new content’).insertBefore(‘selector’);

$("<divclass='newPrettybox'>Iron man</div>").insertBefore('.prettyBox');

結果:

以上的兩個方法都是完成相同的任務,但是在語法上是不一樣的,其結果如下:

<divclass='newPrettybox'>Iron man</div>
<divclass="prettyBox">
   I'm a ipman
</div>
<divclass='newPrettybox'
>Iron man</div>
<divclass="prettyBox">
   I'm a ipman 2

具體的程式碼如下:

<html>
	<head>
		<script type="text/javascript" src="../jquery-1.11.1.min.js"></script>
		<style type="text/css">
			.prettyBox{
				padding:8px;
				background:grey;
				margin-bottom:8px;
				width:300px;
				height:100px;
				
				
				}
				.newPrettybox{
					padding:8px;
					background:red;
					margin-bottom:8px;
					width:200px;
					height:50px;					
					}
			</style>
	</head>
	<body>
		<h1>jquery before() and insertBefore() example</h1>
		<div class="prettyBox">ip man</div>
		<div class="prettyBox">ip man2</div>
		<p>
			<button id="before">before()</button>
			<button id="insertBefore">insertBefore()</button>
			<button id="reset">reset</button>
		</p>
		<script type="text/javascript">
			$("#before").click(function(){
				 $('.prettyBox').before("<div class='newPrettyBox'>iron man</div>");
				
				});
				$("#insertBefore").click(function(){
					$("<div class='newPrettybox'>iron man</div>").insertBefore('.prettyBox');
					
					
					});
					$("#reset").click(function(){
						location.reload();
						});
			
			</script>
	</body>
</html>

效果: