javascript 深拷貝實現__clone

 javascript 中 object類型的元素是淺拷貝的。也就是說副本指向相同地址

<script>var a = b = [];    a.push('aaa');　　console.dir(b);
/*
Array[1]  0: "aaa"  length: 1  __proto__: Array[0]
*/</script>

 實現深層拷貝

<script>function dCopy(o){    if(typeof(o) != 'object') return o;    var _o = o.constructor == Array ? [] :{};    for(var i in o){       _o[i] = dCopy(o[i]);    }    return _o;}var people = {   name:'humen being',   todo:['say','walk']}var programer = dCopy(people);programer.todo.push('code');console.dir(programer);console.dir(people);
/*

Object

1. name: "humen being"
2. todo: Array[3]
1. 0: "say"
2. 1: "walk"
3. 2: "code"
4. length: 3
5. __proto__: Array[0]
3. __proto__: Object 

Object

1. name: "humen being"
2. todo: Array[2]
1. 0: "say"
2. 1: "walk"
3. length: 2
4. __proto__: Array[0]
3. __proto__: Object

*/</script>

 

  沒啥技術含量就是迭代淺拷貝- -