JS使用Object.keys

语法

Object.keys(obj)返回一个由给定对象自身的可枚举的字符串键属性名组成的数组。

参数：要返回其枚举自身属性的对象
返回值：一个表示给定对象的所有可枚举属性的字符串数组

处理对象，返回可枚举的属性数组

let person = {
	name:"张三",
	age:25,
	sex:"男",
	getName:function(){}
}

Object.keys(person) // ["name", "age", "sex","getName"]

处理数组，返回索引值数组

let arr = [1,2,3,4,5,6]

Object.keys(arr) // ["0", "1", "2", "3", "4", "5"]

处理字符串，返回索引值数组

let str = "javascript"

Object.keys(str) // ["0", "1", "2", "3", "4", "5", "6", "7","8","9"]

常用技巧

let person = {
	name:"张三",
	age:25,
	sex:"男",
	getName:function(){}
}

Object.keys(person).map((key)=>{
　　person[key] // 获取到属性对应的值
}) 

Object.values()和Object.keys()是相反的操作，把一个对象的值转换为数组

let str = "javascript"

Object.values(str) // ["j", "a", "v", "a","s","c","r","i","p","t"]