案例：jQuery案例     状态：可编辑再运行    进入竖版
 运行结果　
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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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    $(":image").css("background-color","#B2E0FF");
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});
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</script>
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</head>
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<body>
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<html>
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<body>
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<form action="">
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Name: <input type="text" name="user" />
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<br />
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Password: <input type="password" name="password" />
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<br />
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<input type="image" src="/img/eg_submit.jpg" />
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</form>
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</body>
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</html>
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</body>
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</html>
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