object.keys():取出对象的键，返回字符串属性键的数组
object.values():取出对象的值，返回字符串属性值的数组
Object.entries():取出对象的键值对，返回包含键值对的数组
let a={b:1,c:'AA',d:false} object.keys(a)//return ['b', 'c', 'd'] object.values(a) //return [1, 'AA', false] Object.entries(a) //return [["b",1], ["c", "AA" ], [ "d",false]]
