通过层来实现渐淡淡出

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<div style="200px;height:200px;filter:alpha(opacity=50);border:1px solid #000;background:#efefef" onMouseOver="makevisible(this,0)" onMouseOut="makevisible(this,1)">
ywicc.com
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原文地址:https://www.cnblogs.com/pyt5208/p/446618.html