对象的深度复制

Clone

Object.prototype.Clone = function(){
  var objClone;
  if (this.constructor == Object){
    objClone = new this.constructor();
  }else{
    objClone = new this.constructor(this.valueOf());
  }
  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];
      }
    }
  }
  objClone.toString = this.toString;
  objClone.valueOf = this.valueOf;
  return objClone;
}