reduce範例
引用：https://codepen.io/anon/pen/gjraPG?editors=1011
const ary = [{a: 1}, {b: 2}, {c: 3}]
let ans = {keys:[],values:[]}
ans.total = ary.reduce((prev, next) => {
ans.keys.push(Object.keys(next)[0])
ans.values.push(next[Object.keys(next)[0]])
return prev + next[Object.keys(next)[0]]
} ,0)
console.log(ans)
