js数组对象合并：怎么合并成数组[{'id': 1,}{'id': 2,}{'id': 3,},{'id': 4,}]？

Question

let a = [{
            'id': 1,
        },{
            'id': 2,
        }]

let b = [{
            'id': 3,
        },{
            'id': 4,
        }]
        

怎么合并成数组[{'id': 1,}{'id': 2,}{'id': 3,},{'id': 4,}]

Answer 1

a.concat(b)

Answer 2

[...a, ...b]