ie8兼容透明度opacity
opacity: 0.4;
filter: alpha(apocity=40%);
filter: alpha(opacity = 40) !important;
-ms-filter:'progid:DXImageTransform.Microsoft.Alpha(opacity=40)' !important;
opacity: 0.4;
filter: alpha(apocity=40%);
filter: alpha(opacity = 40) !important;
-ms-filter:'progid:DXImageTransform.Microsoft.Alpha(opacity=40)' !important;