【es6】Generator 函数

function* helloWorldGenertor() {
    yield ‘hello‘;
    yield ‘world‘;
    return ‘ending‘;
}
var hw = helloWorldGenertor();

调用

hw.next()

hw.next()
// { value: ‘hello‘, done: false }

hw.next()
// { value: ‘world‘, done: false }

hw.next()
// { value: ‘ending‘, done: true }

hw.next()
// { value: undefined, done: true }