javascript九宫格碰撞检测

 1 function pengzhuang(obj1,obj2){

 2     var l1=obj1.offsetLeft; 
 3     var r1=obj1.offsetLeft+obj1.offsetWidth;
 4     var t1=obj1.offsetTop;
 5     var b1=obj1.offsetTop+obj1.offsetHeight;
 6 
 7     var l2=obj2.offsetLeft;
 8     var r2=obj2.offsetLeft+obj2.offsetWidth;
 9     var t2=obj2.offsetTop;
10     var b2=obj2.offsetTop+obj2.offsetHeight;
11 
//左排除||右排除||上排除||下排除
12     if(r1<l2||l1>r2||b1<t2||t1>b1){
13         return false
14     }else{
15         return true;
16     }
17 }