fn1.on('done', fn2);

function fn1() {

  setTimeout(function(){

       fn1.trigger('done');

    },1000)

}

（1）fn2像“信号中心”订阅了done信号

        Jquery.subscribe("done", fn2);

(2) fn1向信号中心发布信号

    function fn1(){

        setTimeout(function(){

             Jquery.publish("done");

        },2000)

    }

fn1().then(fn2);

function fn1(){

  var dfd = $.Deferred();

  setTimeout(function(){

     resolve();

  },2000);

}

var fetch = require('node-fetch');

function * gen(){

     var url = "xxxxx.github";

     var result = yelid fetch(url);

    console.log(result.do);

}

var g = gen();

var result = g.next();

result.value.then(function(data){

   return data.json();

}).then(function(data){

    g,next(data)

})

async function getStockPriceByName(name) {

  var symbol = await getStockSymbol(name);

  var stockPrice = await getStockPrice(symbol);

  return stockPrice;

}

getStockPriceByName('goog').then(function (result) {

  console.log(result);

});