Object.keys使用整理

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) = >{

    　　console.log(person[key])

})

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