鼠标拖动，位置互换效果，主要用于div，提高用户体验等方面
div.box{ position:relative; padding:5px; background-color:#000; width:300px; height:300px; overflow:hidden; } div.box div.item{ float:left; width:90px; height:90px; background-color:#ccc; margin:5px; position:relative; cursor:pointer; } div.mask{ width:90px; height:90px; background-color:#f00; opacity:0.8; filter:progid:DXImageTransform.Microsoft.Alpha(opacity=80); position:absolute; visibility:hidden; top:20px; left:20px; z-index:10; } [Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]