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:60px; height:60px;
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        margin:5px; float:left;
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        border:2px white solid; }
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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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  <div></div>
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​
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  <div class="middle"></div>
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  <div class="middle"></div>
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  <div class="middle"></div>
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  <div class="middle"></div>
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​
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  <div></div>
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​
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<script>
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  $("div").css("background", "#c8ebcc")
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    .filter(".middle")
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    .css("border-color", "red");
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</script>
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​
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</body>
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</html>
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​