SOURCE

let a = [1, 3]
let b = [
    {num: 0, def: '你'},
    {num: 1, def: '我'},
    {num: 2, def: '他'},
    {num: 3, def: '它'}
]
let c = b.filter( v => a.includes(v.num))
console.log(c)
console.log(c.map(v => v.def))

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