引用自
要完成此效果把如下代码加入到<head>中区域中
<script LANGUAGE="JavaScript">
bg = new Array(2);
bg[0] = 'http://www.jojoo.net/logo.gif'
bg[1] = '.gif'
bg[2] = 'http://www.jojoo.net/include/1jpg'
index = Math.floor(Math.random() * bg.length);
document.write("<BODY BACKGROUND=" bg[index] ">");
</script>

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