Symbol

 

Symbol

'use strict';

let name1=Symbol('name');
let name2=Symbol('name');
console.log(name1===name2);//false
console.log(Symbol.keyFor(name1));//underfined


let name3=Symbol.for('name');
let name4=Symbol.for('name');
console.log(name3===name4);//true

console.log(Symbol.keyFor(name3));//‘name’


let name=Symbol('name');
let obj= {
    age:22,
    [name]:'leo'
};

//获取所有Symbol元素
console.log(Object.getOwnPropertySymbols(obj) ) ;