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javascript 随意拖动的小方块特效

<div style="width:140px; height:140px; background-color:pink; cursor:pointer;" id="divBlock" onmousedown="divBlock_event_mousedown(arguments[0]);"></div> 
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　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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