请问这个数组怎么copy出来，

Question

a=[{title:'鸭',num:'100'},{title:'鸡',num:'200'}]
能用map，copy出[{'鸭':'100'},{'鸡':'200'}]吗
谢谢

Answer 1

a.map(item => ({
    [item.title]: item.num
}))

Answer 2

let result = a.map(item => {
    let obj = {}
    obj[item.title] = item.num
    return obj
})