JS Implementation Collision Detection Special effects code sharing _jquery

I did collision detection of the package, first look at the example demo, looking at the package

<! DOCTYPE html>  

function encapsulation

 function Iscrash (obj1,obj2) {
  
  var Boolcrash = true;//assumes that true is collision
  
  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) {
  Boolc Rash = true;
  } else{
  Boolcrash = false;
  }
  return boolcrash;
 }