js方法执行完后

// 使用Promise链
doSomething()
  .then(result => doSomethingElse(result))
  .then(newResult => doThirdThing(newResult))
  .catch(error => console.error(error));

// 使用async/await
async function executeTasks() {
  try {
    const result = await doSomething();
    const newResult = await doSomethingElse(result);
    const finalResult = await doThirdThing(newResult);
  } catch (error) {
    console.error(error);
  }
}

// 异步方法示例
function asyncMethod(callback) {
  setTimeout(() => {
    console.log('Async method executed');
    callback();
  }, 1000);
}

// 调用异步方法
asyncMethod(() => {
  console.log('Callback executed');
});

// 使用Promise的异步方法
function promiseMethod() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      console.log('Promise method executed');
      resolve();
    }, 1000);
  });
}

// 调用Promise方法
promiseMethod().then(() => {
  console.log('Promise resolved');
});

// 使用async/await的异步方法
async function asyncAwaitMethod() {
  await promiseMethod();
  console.log('Async/Await method executed');
}

// 调用async/await方法
asyncAwaitMethod();