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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<!DOCTYPE html>
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<html>
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<head>
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  <style>
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  div { width: 80px; height: 80px; background: #abc;
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        border: 2px solid black; margin: 10px; float: left; }
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  div.after { border-color: red; }
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  </style>
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  <script type="text/javascript" src="/js/jquery.js"></script>
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</head>
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​
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<body>
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​
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  <div>first</div>
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  <div>sibling<div>child</div></div>
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  <div>sibling</div>
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  <div>sibling</div>
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​
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<script>
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$("div:first").nextAll().addClass("after");
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</script>
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​
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</body>
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</html>
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​