https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/allSettled

适用于多个事件不相关的场景，不管事件成功还是失败，等待全部完成后再到then，执行后面的语句

Promise.allSettled 里面可以写一堆页面初始化的函数，这样的看起来像并发的执行比顺序执行要快。

const promise1 = Promise.resolve(3);
const promise2 = new Promise((resolve, reject) => setTimeout(reject, 100, 'foo'));
const promises = [promise1, promise2];

Promise.allSettled(promises).
  then((results) => results.forEach((result) => console.log(result.status)));

// expected output:
// "fulfilled"
// "rejected"