JS浅拷贝和深拷贝原理与实现方法分析

function shallowClone (initalObj) {
   var obj = {};
   for ( var i in initalObj) {
    obj[i] = initalObj[i];
   }
   return obj;
}

let newObj = Object.assign({}, obj);

let newObj = {...obj};

let newObj = JSON.parse(JSON.stringify(obj));

var $ = require('jquery');
var newObj = $.extend(true, {}, obj);

var _ = require('lodash');
var newObj = _.cloneDeep(obj);

deepClone = (obj) => {
    let objClone = Array.isArray(obj)?[]:{};
    if(obj && typeof obj==="object"){
      // for...in 会把继承的属性一起遍历
      for(let key in obj){
        // 判断是不是自有属性，而不是继承属性
        if(obj.hasOwnProperty(key)){
          //判断ojb子元素是否为对象或数组，如果是，递归复制
          if(obj[key]&&typeof obj[key] ==="object"){
            objClone[key] = this.deepClone(obj[key]);
          }else{
            //如果不是，简单复制
            objClone[key] = obj[key];
          }
        }
      }
    }
    return objClone;
}