Object.entries

Object.entries方法返回一个数组，成员是参数对象自身的（不含继承的）所有可遍历（enumerable）属性的键值对数组

参数为对象
const res = Object.entries({ name: 'xiaoming', age: 'seven',sex: 'man', grade: 'four' })
console.log(res); 

[['name', 'xiaoming']
['age', 'seven']
['sex', 'man']
['grade', 'four']]

参数为数组
const obj = [1,2,3,4,5,6]
const res = Object.entries(obj) 
console.log(res); 

[['0', 1]
['1', 2]
['2', 3]
['3', 4]
['4', 5]
['5', 6]]