案例：javascript案例     状态：可编辑再运行    进入横版
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<html>
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<head>
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<style type="text/css">
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body
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{
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background-color="#FFCC80";
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background-image:url(/img/eg_bg_desert.jpg);
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}
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p
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{
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color:white;
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}
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</style>
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<script type="text/javascript">
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function changeAttachment()
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{
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document.body.style.backgroundAttachment="fixed";
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}
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</script>
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​
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</head>
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<body>
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​
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<input type="button" onclick="changeAttachment()" value="Set background-image to be fixed" />

 运行结果　
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