第一种情况

const deps = {
    '采购部':[1,2,3],
    '人事部':[5,8,12],
    '行政部':[5,14,79],
    '运输部':[3,64,105],
}
let member = [...new Set(Object.values(deps).flat(Infinity))]
console.log(member)

第二种情况

//扁平化加上去重
const arr = [1, [2, 3], [[3, 4, 2], 1], 5, [3]]
const flatten = (arr) => {
    return arr.reduce((pre, next) => {
        return [...new Set(pre.concat(Array.isArray(next) ? flatten(next) : next))] 
    }, [])
}

console.log(flatten(arr))