Object.keys()的用法

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

1.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(){
    }};
console.log(Object.keys(person));

Object.keys(item.alarmAttribute || {
    }).length)

2.处理数组，返回索引值数组

let arr = [1,2,3,4,5,6];
console.log(Object.keys(arr));  //["0", "1", "2", "3", "4", "5"]

3.处理字符串，返回索引值数组

let str = "ikun你好";
console.log(Object.keys(str));  // ["0", "1", "2", "3", "4", "5"]

4.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]);  // 获取到属性对应的值，做一些处理
})

项目中使用

Object.keys(dvehicleInfo).forEach(key => {
    
          if (key === "containervolume" && dvehicleInfo[key] === "") {
    
            this.Volume_Static = 1;
            if (dvehicleInfo.container) {
    
              dvehicleInfo.container.split(",").map((item, index) => {
    
                this.containerOptions[index].len = item;
              });
            }
}