css鼠标经过图片，图片变色变暗透明:1、CSS代码 .div1.div2{ width:500px; margin:20px auto} .div1 a:hover img{filter:alpha(Opacity=80);-moz-opacity:0.8;opacity: 0.8} .div2 a:hover img{filter:alpha(Opacity=70);-moz-o