对象属性赋值 #

// example1
let a = {}, b = '123', c = 123
a[b] = 'b'
a[c] = 'c'
console.log(a[b])

// example 2
let a = {}, b = Symbol('123'), c = Symbol('123')
a[b] = 'b'
a[c] = 'c'
console.log(a[b])

// example 3
let a = {}, b = { key:'123' }, c = { key:'456' }
a[b] = 'b'
a[c] = 'c'
console.log(a[b])

const obj = {}
obj[0] = 100
const x = { s: 'abc' }
obj[x] = 200
const y = Symbol()
obj[y] = 300
const z = true
obj[z] = 400

Object.keys(obj) // ['0', '[object Object]', 'true']