let a = Symbol();
let obj = {
    [a]: 'wanjunshijie'
}
console.log(obj[a])
obj[a] = 'web'
console.log(obj[a])

let a = Symbol();
let obj = {
    [a]: 'test',
    name: 'wanjunshijie',
    skill: 'web'
}
for (let item in obj) {
    console.log(obj[item])
}
console.log(obj[a])