.ToTop{
    position: fixed;//类似于absolute,不过其包含块是视窗本身
    bottom: 0;
    background: black;
    width: 90px;
    height: 90px;
    line-height: 23px;
    z-index: 9999;
    opacity: 0.6;//Chrome
/*以下针对IE*/ filter: alpha(opacity
=60); _bottom: auto; _width: 100%; _position: absolute; _top: expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-(parseInt(this.currentStyle.marginTop,10)||0)-(parseInt(this.currentStyle.marginBottom,10)||0))); }

 

 

 

 

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