效果图：
代码如下：
<!DOCTYPE html>
<html>
<head lang="en"><meta charset="UTF-8"><title>优化后的无缝轮播图</title><style>body{-webkit-user-select: none; }ul,li{list-style: none;}#outer{width: 400px;height: 300px;position: relative;margin: 50px auto;overflow: hidden;}#inner{width: 2000px;height: 300px;position: absolute;left:0;}#inner div{width: 400px;height: 300px;float: left;}#ulHead{position: absolute;top: 250px;right: 20px;}
和hashCode())
