用CSS中的Alpha实现渐变

效果一：
<div ></div>

HTML代码

效果二：
<img src="upimg/mn.jpg" width=400 style="FILTER: progid:DXImageTransform.Microsoft.Alpha( style=1,opacity=85,finishOpacity=0,startX=0,finishX=100,startY=0,finishY=100);">

HTML代码

效果三：
<img src="upimg/mn.jpg" width=400 style="FILTER: Alpha( style=1,opacity=0,finishOpacity=100,startX=0,finishX=100,startY=0,finishY=100);">

HTML代码

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