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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  $(".btn1").click(function(){
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    $("p").wrap("<div></div>");
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  });
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});
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</script>
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<style type="text/css">
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div{background-color:yellow;}
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</style>
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</head>
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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 class="btn1">用 div 包裹每个段落</button>
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</body>
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</html>
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