判断可拖动div是否重合 重合多少_javascript技巧

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>Table</title> <style type="text/css"> body{margin:0px; padding:0px; font-size:12px} .div{height:160px;width:160px;position:absolute; text-align:center; } .demo1{ border:1px solid #96C2F1;background-color:#EFF7FF;left:150px;top:20px} .demo2{ border:1px solid #9BDF70;background-color:#F0FBEB;left:450px;top:20px} .demo3{ border:1px solid #BBE1F1;background-color:#EEFAFF;left:750px;top:20px} .demo4{ border:1px solid #96C2F1;background-color:#EEFAFF;left:150px;top:220px} .demo5{ border:1px solid #FFCC00;background-color:#FFFFF7;left:450px;top:220px} .demo6{ border:1px solid #E3E197;background-color:#FFFFDD;left:750px;top:220px} .demo7{ border:1px solid #ADCD3C;background-color:#F2FDDB;left:150px;top:420px} .demo8{ border:1px solid #F8B3D0;background-color:#FFF5FA;left:450px;top:420px} .demo9{ border:1px solid #D3D3D3;background-color:#F7F7F7;left:750px;top:420px} .focus{background-color: #990000;} </style> <div id="demo1" class="div demo1">demo1</div> <div id="demo2" class="div demo2">demo2</div> <div id="demo3" class="div demo3">demo3</div> <div id="demo4" class="div demo4">demo4</div> <div id="demo5" class="div demo5">demo5</div> <div id="demo6" class="div demo6">demo6</div> <div id="demo7" class="div demo7">demo7</div> <div id="demo8" class="div demo8">demo8</div> <div id="demo9" class="div demo9">demo9</div> <script language="javascript"> (function(window,undefined){ window.Sys = function (ua){ var b = { ie: /msie/.test(ua) && !/opera/.test(ua), opera: /opera/.test(ua), safari: /webkit/.test(ua) && !/chrome/.test(ua), firefox: /firefox/.test(ua), chrome: /chrome/.test(ua) },vMark = ""; for (var i in b) { if (b[i]) { vMark = "safari" == i ? 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