/******************使用回调函数 操作异步函数中获取的值********************************************************** */
function getName(callback) {
  setTimeout(() => {
    callback("John Doe");
  }, 2000);
getName(name => {
  console.log(name);
/*******************使用 promise 操作异步函数中获取的值********************************************************* */
function getAge() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve(18);
    }, 2000);
getAge()
  .then(age => {
    // 使用 promise 操作异步函数中获取的值
    console.log(age, 1);
    return age; // 传递给下一个 then, promise链
  .then(age => {
    console.log(age, 2);
    return age;
/******************** 一个Promise对象可以做什么? ******************************************************** */
const promise = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve("John Doe");
    reject("Error");
  }, 2000);
promise
  // 捕获 resolve 中的内容
  .then(name => {
    console.log(name);
  // 捕获 reject 中的内容
  .catch(error => {
    console.log(error);
  .finally(() => {
    // 无论 resolve 或 reject 都会执行
                            
Uncaught (in promise) DOMException: The play() request was interrupted by a new load request.异常处理
                            
[Vue warn]: Error in v-on handler (Promise/async): “NavigationDuplicated: Navigating to current loca