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position:absolute; bottom:0; top:0;
如果您的元素不是身体，请使用
position:relative
在父级上，以及特定的宽度和高度。
试试这个：http: //jsfiddle.net/bBhUX/
添加
position: fixed; overflow: hidden;
进入父容器
利用
position:absolute; //or fixed if you want it to remain at constant position even when scrolled bottom: 0;