案例：jquery案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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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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.ancestors *
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{
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display: block;
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border: 2px solid lightgrey;
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color: lightgrey;
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padding: 5px;
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margin: 15px;
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}
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</style>
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<script src="/js/jquery-1.11.1.min.js">
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</script>
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<script>
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$(document).ready(function(){
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  $("span").parent().css({"color":"red","border":"2px solid red"});
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});
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</script>
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</head>
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<body>
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​
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<div class="ancestors">
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  <div style="width:500px;">div (曾祖父)
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    <ul>ul (祖父)
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      <li>li (直接父)
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        <span>span</span>
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      </li>
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    </ul>
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  </div>
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​
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  <div style="width:500px;">div (祖父)
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    <p>p (直接父)
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        <span>span</span>
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      </p>
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  </div>
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</div>
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​
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</body>
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</html>
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​