a标签在当作遮罩层来使用的时候, 在ie中需要设置透明背景, 才能覆盖底下的其他元素
.grid-wrap .clubs li a { display: block; position: absolute; top: 0px; left: 0px; z-index: 2; width: 90px; height: 110px; background: url("about:blank"); }
.grid-wrap .clubs li a { display: block; position: absolute; top: 0px; left: 0px; z-index: 2; width: 90px; height: 110px; background: url("about:blank"); }