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/**
* 克隆对象
*/
//函数法
function cloneObj(myObj){
  if(typeof(myObj) != 'object') { return myObj; }
  if(myObj == null) { return myObj; }

  if(myObj instanceof Array ){
    var myNewObj = [];
  }else{
    var myNewObj = new Object();
  }
  for(var i in myObj)  {
    myNewObj[i] = cloneObj(myObj[i]);
  }
  return myNewObj;
}
//原型链法
Object.prototype.objectCopy = function()
{
    var objClone;
    if ( this.constructor == Object ) {
      if(this.constructor instanceof Array){
        objClone = [];
      }else{
        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].objectCopy();
             }
            else
             {
                 objClone[key] = this[key];
             }
         }
     }
     objClone.toString = this.toString;
     objClone.valueOf = this.valueOf;
    return objClone;
}