案例：jQuery案例     状态：可编辑再运行    进入横版
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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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    $("tr:gt(2)").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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<h1>Welcome to My Web Page</h1>
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​
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<table>
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<tr>
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<th>Id</th>
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<th>LastName</th>
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​
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<th>FirstName</th>
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<th>Address</th>

 运行结果　
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