Object. Usage of keys()

Object.keys(obj)

• Parameters ： To return an object that enumerates its own properties
• Return value ： An array of strings representing all enumerable properties of a given object

1. Deal with people , Returns an enumerable array of properties

let person = {
    name:" Zhang San ",age:25,address:" Shenzhen ",getName:function(){
    }};
console.log(Object.keys(person));

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

2. Handling arrays , Returns an array of index values

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

3. Processing strings , Returns an array of index values

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

4. Common skills

let person = {
    name:" Zhang San ",age:25,address:" Shenzhen ",getName:function(){
    }};
Object.keys(person).map((key)=>{
    
    console.log(person[key]);  //  Get the corresponding value of the attribute , Do something about it 
})

Project use

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;
              });
            }
}