介绍:

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

使用:

一、处理对象,返回可枚举的属性数组

 
  1. let person = {name:"张三",age:26,address:"广州",getPhone:function(){}}

  2.  
  3. Object.keys(person) // ["name", "age", "address","getPhone"]

二、处理数组,返回索引值数组

 
  1. let arr = [1,2,3,4,5,6]

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

三、处理字符串,返回索引值数组

 
  1. let str = "wasdr字符串"

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

常用技巧

 
  1. let person = {name:"张三",age:26,address:"广州",getPhone:function(){}}

  2.  
  3. Object.keys(person).map((key)=>{

  4.  
  5.   person[key] // 获取到属性对应的值,做一些处理

  6.  
  7. }) 

PS:

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