JS小问题之——碰撞检测

 1 　　isButt:function(obj1,obj2){
 2         var l1=obj1.offsetLeft;
 3         var t1=obj1.offsetTop;
 4         var r1=l1+obj1.offsetWidth;
 5         var b1=t1+obj1.offsetHeight;
 6 
 7         var l2=obj2.offsetLeft;
 8         var t2=obj2.offsetTop;
 9         var r2=l2+obj2.offsetWidth;
10         var b2=t2+obj2.offsetHeight;
11         return!(r1<l2||b1<t2||r2<l1||b2<t1)
12     }