javascript - es6中yield和yield*有什么区别？-PHP中文网问答

javascript - es6中yield和yield*有什么区别？

阿神 2017-04-11 12:14:08

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一个*号的区别吗？

阿神

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高洛峰2017-04-11 12:16:08 1楼

The yield keyword is used to pause and resume a generator function.
The yield* expression is used to delegate to another generator or iterable object.

function* g1() {
  yield 2
  yield 3
}

function* g2() {
  yield 1
  yield g1()
  yield* g1()
  yield [4, 5]
  yield* [6, 7]
}

const iterator = g2()

console.log(iterator.next()) // { value: 1, done: false }
console.log(iterator.next()) // { value: {}, done: false }
console.log(iterator.next()) // { value: 2, done: false }
console.log(iterator.next()) // { value: 3, done: false }
console.log(iterator.next()) // { value: [4, 5], done: false }
console.log(iterator.next()) // { value: 6, done: false }
console.log(iterator.next()) // { value: 7, done: false }
console.log(iterator.next()) // { value: undefined, done: true }

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