单选题

vara={},b='123',c=123a[b]='b'a[c]='...

Question

var a={}, b='123', c=123

a[b]='b'

a[c]='c'

console.log(a[b])

// example 2

var a={}, b=Symbol('123'), c=Symbol('123')

a[b]='b'

a[c]='c'

console.log(a[b])

// example 3

var a={}, b={key:'123'}, c={key:'456'}

a[b]='b'

a[c]='c'

console.log(a[b])

A.

b

b

b

B.

c

b

b

C.

c

c

b

D.

c

b

c