javascript 深拷贝实现__clone

原文链接： http://www.cnblogs.com/glory-jzx/archive/2012/11/10/2763557.html

 javascript 中 object类型的元素是浅拷贝的。也就是说副本指向相同地址

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

 实现深层拷贝

<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>

  没啥技术含量就是迭代浅拷贝- -

转载于:https://www.cnblogs.com/glory-jzx/archive/2012/11/10/2763557.html