js实现一个深度克隆

//var arr = [1,2,[11,22]];
var arr = {
	name:"xiao",
	age:{
		first:"diyi",
		two:"第二"
	}
};
function deepCopy(parm){
	let res;
	if(Object.prototype.toString.call(parm) == "[object Array]"){   //数组
		res = [];
		for(var i = 0;i < parm.length;i++){
			res[i] = deepCopy(parm[i]);
		}
	}else if(Object.prototype.toString.call(parm) == "[object Object]"){  //对象
		res = {};
		for(var i in parm){
			res[i] = deepCopy(parm[i]);
		}
	}else{
		return parm;
	}
	return res;
}
var newarr = deepCopy(arr);
//arr[1] = "xx";
arr.name = "gejin";
console.log(newarr);