强制刷新

< meta http-equiv = "X-UA-Compatible" content = "IE=8" />
< meta http-equiv="Pragma" content="no-cache" />
< meta http-equiv="Cache-Control" content="no-cache"/>
< meta http-equiv="Expires" content="0" />

//居中
.box{width:100%;text-align:center;}
.box .contBox{width:970px;height:500px;margin:0 auto;text-align:left;}