5.2 使用数组解构
eslint: prefer-destructuring jscs: requireArrayDestructuring
const arr=[1,2,3,4]
// bad
const first=arr[0]
const second=arr[1]
// good
const [first,second]=arr
eslint: prefer-destructuring jscs: requireArrayDestructuring
const arr=[1,2,3,4]
// bad
const first=arr[0]
const second=arr[1]
// good
const [first,second]=arr