js实现碰撞检测特效代码分享

自己做了碰撞检测的封装,先看下实例demo,在看封装

 
 
 
 
  *{
  margin: 0;
  padding: 0;
  }
  #divA,#divB{
  width: 200px;
  height: 200px;
  background-color: purple;
  font-size: 50px;
  line-height: 200px;
  text-align: center;
  position: absolute;
  color: #fff;
  }
  #divA{
  left: 30px;
  top: 30px;
  z-index: 5;
  }
  #divB{
  left: 300px;
  top: 300px;
  }
 
 
 
 A
 B
 
 

函数封装

 function isCrash (obj1,obj2) {
  
  var boolCrash = true;//假设true为碰撞
  
  var left1 = obj1.offsetLeft;
  
  var right1 = obj1.offsetLeft + obj1.offsetWidth;
  
  var top1 = obj1.offsetTop;
  
  var bottom1 = obj1.offsetTop + obj1.offsetHeight;
 
  var left2 = obj2.offsetLeft;
  
  var right2 = obj2.offsetLeft + obj2.offsetWidth;
  
  var top2 = obj2.offsetTop;
  
  var bottom2 = obj2.offsetTop + obj2.offsetHeight;
  
  
  if (right1 > left2 && left1 < right2 && bottom1 > top2 && top1 < bottom2) {
  boolCrash = true;
  } else{
  boolCrash = false;
  }
  return boolCrash;
 }