<script>var imgs =["http://images.cnblogs.com/cnblogs_com/xiaobo-Linux/1112236/o_2.jpg", ??????????????"http://images.cnblogs.com/cnblogs_com/xiaobo-Linux/1112236/o_default.png", ?????????????"http://images.cnblogs.com/cnblogs_com/xiaobo-Linux/1112236/o_3.jpg", ?????????????"http://images.cnblogs.com/cnblogs_com/xiaobo-Linux/1112236/o_1.jpg", ?????????????"http://images.cnblogs.com/cnblogs_com/xiaobo-Linux/1112236/o_4.jpg", ?????????????"http://images.cnblogs.com/cnblogs_com/xiaobo-Linux/1112236/o_5.jpg", ?????????????"http://images.cnblogs.com/cnblogs_com/xiaobo-Linux/1112236/o_6.jpg", ?????????????"http://images.cnblogs.com/cnblogs_com/xiaobo-Linux/1112236/o_default-2.jpg", ?????????????]; ???var index=Math.floor(Math.random()*8);var img = imgs[index]; ???????function time(){ ????????????????????????????document.body.style.backgroundImage="url("+img+")"; ?????????????????????} ???document.body.onload = function(){ ?time();}</script>js设置随机切换背景图片
原文地址：http://www.cnblogs.com/xiaobo-Linux/p/7816270.html