所以我最近開始學習如何使用 babel 轉譯器，但我發現了一個與預設的主要區別。當我使用 es2015 預設時。代碼已成功轉譯，并且在我的瀏覽器中運行良好，但是當我使用 env-preset 時，代碼也已轉譯，但根本不起作用。下面是我用ES6寫的原代碼const jokeEl = document.getElementById('joke');const getJoke = document.getElementById('getJoke');getJoke.addEventListener('click', generateJoke);generateJoke();async function generateJoke () {    const jokeRes = await fetch('https://icanhazdadjoke.com/', {        headers: {            'Accept' : 'application/json'        }    });    const joke = await jokeRes.json();    jokeEl.textContent = joke.joke;}這是我使用 es2015 預設時有效的代碼。'use strict';var jokeEl = document.getElementById('joke');var getJoke = document.getElementById('getJoke');getJoke.addEventListener('click', generateJoke);generateJoke();async function generateJoke () {    var jokeRes = await fetch('https://icanhazdadjoke.com/', {        headers: {            'Accept' : 'application/json'        }    });    var joke = await jokeRes.json();    jokeEl.textContent = joke.joke;}然后，這是不起作用的代碼，它是使用 env 預設生成的。"use strict";function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }var jokeEl = document.getElementById('joke');var getJoke = document.getElementById('getJoke');getJoke.addEventListener('click', generateJoke);generateJoke();function generateJoke() {  return _generateJoke.apply(this, arguments);}