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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  $("button").click(function(){
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    $("p").css({
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      "color":"white",
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      "background-color":"#98bf21",
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      "font-family":"Arial",
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      "font-size":"20px",
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      "padding":"5px"
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    });
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  });
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});
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</script>
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</head>
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​
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<body>
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<p>This is a paragraph.</p>
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<p>This is another paragraph.</p>
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<button type="button">改变段落的样式</button>
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</body>
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</html>
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​