ES6 面试题合并两个对象

方法一 ES6 Object.assign()

const obj1 = {a:1, b: 4}
const obj2 = {c:3, b: 2}

console.log(Object.assign(obj1, obj2)) //{ a: 1, b: 2, c: 3 }

方法二 ES6 扩展运算符

const obj1 = {a:1, b: 4}
const obj2 = {c:3, b: 2}

console.log({...obj1, ...obj2}) //{ a: 1, b: 2, c: 3 }

方法三 自己封装

const obj1 = {a:1, b: 4}
const obj2 = {c:3, b: 2}

function extend(target, source){
    for(var key in source){
        target[key] = source[key]
    }
    return target
}
console.log(extend(obj1, obj2)) //{ a: 1, b: 2, c: 3 }