js如何设置随机切换背景图片

<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>

以上内容就是js设置随机切换背景图片的简单实例，希望能帮助到大家。