1 position: absolute;bottom: 0;width: 100%;
2.当隐藏内容显示的时候 js 设置position为relative
$("#buttomPostion").css({"position":"relative","margin-top":"10px"});
3.z-index: -1
或者
<div id="buttomPostion" style="overflow:
hidden; position:
fixed;bottom:
0;width:
100%
;" >
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