案例：javascript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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<style type="text/css">
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p
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{
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border: thin dotted #FF0000;
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}
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</style>
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<script type="text/javascript">
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function changeBorder()
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{
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document.getElementById("p1").style.borderBottom="thick solid blue";
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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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<input type="button" onclick="changeBorder()" value="Change bottom border" />
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<p id="p1">This is a paragraph with a border</p>
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​
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</body>
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</html>
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​