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object.assign()

admin 12月 03, 2020 0

https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/assign

1. 用来更新对象中的某些属性

Object.assign(targetObj, sourceObj); sourceObj是用来更新targetObj的

let obj = {
    a: 1,
    b: 2,
    c: 5,
    d: 6,
};
let obj3 = Object.assign({}, obj);
const obj2  = {
    a: 100,
    c: 99
}
// 合并
Object.assign(obj3, obj2);
console.log(obj,obj3);

2. 用来深拷贝

Object.assign({},obj) 的方法，第一个参数一定要为空

let obj = {name: '二月', age: {c: 12}}
let age = {c: 88}
let o2 = Object.assign({}, obj, {age});
let o3 = Object.assign({},obj);
o3.name = "四月";
console.log(obj,o2,o3);