javascript – for..of和迭代器状态

it = iter([1,2,3,4,5])

for x in it:
    print x
    if x == 3:
        break

print '---'

for x in it:
    print x

它打印1 2 3 — 4 5,因为迭代器会记住它在循环中的状态.当我在JS中看似相同的事情时,我得到的只是1 2 3 —.

function* iter(a) {
    yield* a;
}

it = iter([1,5])

for (let x of it) {
    console.log(X)
    if (x === 3)
        break
}

console.log('---')

for (let x of it) {
    console.log(X)
}

我错过了什么？