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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    $("p:first").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 Homepage</h1>
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<p class="intro">My name is Donald</p>
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<p>I live in Duckburg</p>
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<p>My best friend is Mickey</p>
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<div id="choose">
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Who is your favourite:
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<ul>
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<li>Goofy</li>
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<li>Mickey</li>
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<li>Pluto</li>
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</ul>
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</div>
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</body>
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</html>
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</body>
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</html>
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​
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