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基于jQuery判断两个元素是否有重叠部分的代码

发布时间：2013-05-18 编辑：jiaochengji.com

原理很简单，就是判断一个元素的四个点是否在另一个元素内部，需要的朋友可以参考下

原理很简单，就是判断一个元素的四个点是否在另一个元素内部，需要的朋友可以参考下核心代码：

复制代码代码如下:

 
$("#result").text(isOverlap("one","two")+","+isOverlap("one","three")+","+isOverlap("two","three")); 
function isOverlap(idOne,idTwo){ 
var objOne=$("#"+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; 
} 

原理很简单，就是判断一个元素的四个点是否在另一个元素内部。
完整演示代码：

复制代码代码如下:

JSCode
LoginResult JavaScript HTML CSS ALL Edit Share
$("#result").text(isOverlap("one","two")+","+isOverlap("one","three")+","+isOverlap("two","three"));
function isOverlap(idOne,idTwo){
var objOne=$("#"+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;
}
<div id="one">One</div>
<div id="two">Two</div>
<div id="three">Three</div>
<h1 id="result"></h1>
div{
width:200px;
height:200px;
background:#EEE;
}
#two{
position:absolute;
left:100px;
top:50px;
background:#F60;
}
DownLoad
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>JSCode demo</title>
<style type="text/css">
div{
width:200px;
height:200px;
background:#EEE;
}
#two{
position:absolute;
left:100px;
top:50px;
background:#F60;
}
</style>
<script src="/js_lib/jquery-1.7.2.js" type="text/javascript"></script>
</head>
<body>
<div id="one">One</div>
<div id="two">Two</div>
<div id="three">Three</div>
<h1 id="result"></h1>
<script type="text/javascript">
$("#result").text(isOverlap("one","two")+","+isOverlap("one","three")+","+isOverlap("two","three"));
function isOverlap(idOne,idTwo){
var objOne=$("#"+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;
}
</script>
</body>
</html>
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