清华大佬ES

Object.assign 本质上是把source 覆盖到target 上

const source1 = {
    aaa: 'source-a',
    bbb: 'source-b'
}

const target = {
    aaa: 'target-a',
    ccc: 'target-c'
}

const result = Object.assign(target, source1);

console.log('result :>> ', result); // result :>> { aaa: 'source-a', ccc: 'target-c', bbb: 'source-b' }
console.log(target === result); // true