const a = {}
const b = {key: 'b'}
const c = {key: 'c'}
a[b] = 123
a = 456
console.log(a[b])- A:
123 - B:
456 - C:
undefined - D:
ReferenceError
参考答案
const a = {}
const b = {key: 'b'}
const c = {key: 'c'}
a[b] = 123
a = 456
console.log(a[b])123456undefinedReferenceError参考答案