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"]

【转】Object.keys方法之详解-LMLPHP

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"]

【转】Object.keys方法之详解-LMLPHP

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"]

【转】Object.keys方法之详解-LMLPHP

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

})

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

  转自:https://www.cnblogs.com/llcdxh/p/9476347.html

05-26 21:49