ES6 生成器函数双向通信

function* ask() {
   const name = yield "What is your name?";
   const sport = yield "What is your favorite sport?";
   return `${name}'s favorite sport is ${sport}`;
}  
const it = ask();
console.log(it.next());
console.log(it.next('Ethan'));  
console.log(it.next('Cricket'));