Javascript对象Clone实例分析

Object.prototype.Clone=function()
{
  var objClone=new this.constructor();
  //这里是创建一个与被Clone对象相同结构的对象
  for(var key in this)
  {
   if(objClone[key]!=this[key])
   {
    if(typeof(this[key])=='object')
    {
     objClone[key]=this[key].Clone();
    }
    else
    {
     objClone[key]=this[key];
    }
   }
  }
  if(!objClone || (''+objClone)=='')
  {
   return (new String(this)+objClone)?this:objClone;
  }
  else
  {
   objClone.toString=this.toString;
   return objClone;
  }
}