用jQuery判斷兩個元素是否有重疊部分

　　這是博問中的一個問題：http://q.cnblogs.com/q/39172/

　　我的方案如下：

function isOverlap(idOne,idTwo){    var objOne=$("#"+idOne),        objTwo=$("#"+idTwo),        offsetOne = objOne.offset(),        offsetTwo = objTwo.offset(),        topOne=offsetOne.top,        topTwo=offsetTwo.top,        leftOne=offsetOne.left,        leftTwo=offsetTwo.left,        widthOne = objOne.width(),        widthTwo = objTwo.width(),        heightOne = objOne.height(),        heightTwo = objTwo.height();    var leftTop = leftTwo > leftOne && leftTwo < leftOne+widthOne             && topTwo > topOne && topTwo < topOne+heightOne,        rightTop = leftTwo+widthTwo > leftOne && leftTwo+widthTwo < leftOne+widthOne             && topTwo > topOne && topTwo < topOne+heightOne,        leftBottom = leftTwo > leftOne && leftTwo < leftOne+widthOne             && topTwo+heightTwo > topOne && topTwo+heightTwo < topOne+heightOne,        rightBottom = leftTwo+widthTwo > leftOne && leftTwo+widthTwo < leftOne+widthOne             && topTwo+heightTwo > topOne && topTwo+heightTwo < topOne+heightOne;    return leftTop || rightTop || leftBottom || rightBottom;}

　　原理很簡單，就是判斷一個元素的四個點是否在另一個元素內部。

　　Demo:

　　如果有其他方案歡迎提出。