深拷贝与浅拷贝

1、基本数据类型的拷贝就是值得拷贝

2、引用数据类型的拷贝分为浅拷贝跟深拷贝

浅拷贝:目标对象跟源对象共用一个实体,只是变量名不同

深拷贝:目标对象跟源对象都是独立的个体

3、浅拷贝的方法:Object.assign()

4、深拷贝的方法:

  4-1:将对象转换成字符串(JSON.stringfy)->再将字符串转换成对象(JSON.parse)

    注意:无法拷贝原始对象的函数,因为函数无法转换成字符串

  4-2:递归循环

function deepCopy(origin,target){
  var target = null;
  if(typeof origin === 'object' && origin !== null){
    target = origin instanceof Array ? [] : {}
    for(var key in origin){
      target[key] = deepCopy(origin[key],target[key]);
    }
  }else{
    target = origin;
  }
  return target
}

//例子
var obj = {
  "request_id": "9cf24cde471257bdff47-0000", 
  "code": 0, 
  "data": [
      {
          "id": "1", 
          "parent_id": "0", 
          "name": "佛山分公司", 
          "children": [
              {
                  "id": "2", 
                  "parent_id": "1", 
                  "name": "总经办", 
                  "children": [ ]
              }, 
              {
                  "id": "5", 
                  "parent_id": "1", 
                  "name": "综合管理部", 
                  "children": [
                      {
                          "id": "8", 
                          "parent_id": "5", 
                          "name": "行政部", 
                          "children": [ ]
                      }, 
                      {
                          "id": "9", 
                          "parent_id": "5", 
                          "name": "人事部", 
                          "children": [ ]
                      }
                  ]
              }
          ]
      }
  ], 
}
var target = null;
target = deepCopy(obj,target)
console.log('111',target);

  

posted @ 2021-05-31 09:27  我爱小明  阅读(47)  评论(0编辑  收藏  举报