一、语法
Object.keys(obj)
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
二、处理对象,返回可枚举的属性数组
let person = {name:"张三",age:25,address:"深圳",getName:function(){}}
Object.keys(person) // ["name", "age", "address","getName"]
三、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"]
四、处理字符串,返回索引值数组
let str = "saasd 字符串"
Object.keys(str) // ["0", "1", "2", "3", "4", "5", "6", "7"]
五、常用技巧
let person = {name:"张三",age:25,address:"深圳",getName:function(){}}
Object.keys(person).map((key)=>{person[key] // 获取到属性对应的值,做一些处理
})