Jquery实现遮罩

HTML <div id="mask"></div> CSS #mask {position: absolute; top: 0px; filter: alpha(opacity=60); background-color: #777;z-index:0; left: 0px;opacity:0.0; -moz-opacity:0.5;} 根据实际状况进行设置。z-index为遮罩的层级，小于遮

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