合并对象的几种方法

运算扩展符

let obj1 = {
    a:'111'}
let obj2 = {
    b : '222'}
let newObj = {
   ...obj1,...obj2}
console.log(newObj === obj1)  // false
console.log(newObj === obj2)  // false
//

Object.assign

let obj1 = {
    a:'111'}
let obj2 = {
    b : '222',a:'foo'}
let newObj = Object.assign(obj1,obj2)
console.log(newObj === obj1) // true
console.log(newObj === obj2) // false
// 后面的对象属性,会覆盖前面的对象属性

_.merge(object, [sources]) -----------工具库lodash

https://www.lodashjs.com/docs/lodash.merge#_mergeobject-sources

var object = {
   
  'a': [{
    'b': 2 }, {
    'd': 4 }]
};

var other = {
   
  'a': [{
    'c': 3 }, {
    'e': 5 }]
};

_.merge(object, other);
// => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }