案例：jQuery案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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<html>
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<head>
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<script type="text/javascript" src="/js/jquery.js"></script>
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<script type="text/javascript">
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$(document).ready(function(){
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  $("div").click(function() {
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    $(this).css(
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      "width", function(index, value) {return parseFloat(value) * 1.2;}
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    );
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  });
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});
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</script>
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<style>
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div {width:100px; height:50px; background-color:red;}
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</style>
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</head>
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​
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<body>
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<div>请点击这里</div>
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</body>
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</html>
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​