Generator:

创建：

function* g() {} // g: [object Generator]

let g = function*() {};

let obj = {
*g() {}
};

const generatorName = ‘g‘;
let obj = {
*[generatorName]() {}
};

const generatorName = ‘g‘;
class Klazz {
*[generatorName]() {}
}

iterator:

const generatorFunction = function* (){
yield 1;
yield 2;
};

let generator = new generatorFunction();

typeof generator // object

typeof generator[Symbol.iterator]; // function

let a = ‘‘;
function iterateForOf(){
for (let value of generator) {
a += value; // a: ‘12‘
}
}

yield:

function* generatorFunction() {
yield ‘hello‘;
yield ‘world‘;
}

let generator = generatorFunction();

let values = Array.from(generator); // [‘hello‘, ‘world‘]

let thisStep = generator.next();
let [value, done] = [thisStep.value, thisStep.done]; // hello, false

let thatStep = generator.next();
let [value, done] = [thisStep.value, thisStep.done]; // world, false

generator.done // true

function* fibonacci() {
let a = 0, b = 1;
//1, 2
while(true) {
yield a;
a = b;
b = a + b;
}
}

参数：

function* generatorFunction(v) {
yield v;
}

let iterator = generatorFunction(3);
assert.equal(iterator.next().value, 3);
assert.equal(iterator.next(2).value, 2);
});

function* ticketGenerator(){ // 不断递增，知道.next传入true

for(var i=0; true; i++){

var reset = yield i;

if(reset) {i = -1;}

}

}

替代callback：

function run(generatorFunction) { var generatorItr = generatorFunction(resume); function resume(callbackValue) { generatorItr.next(callbackValue); } generatorItr.next()
}

run(function* myDelayedMessages(resume) {

console.log(yield delay(1000, resume));

console.log(yield delay(1200, resume));

})