当RxJS观察值需要作为同步数据时，如何正确使用它们

import { from } from 'rxjs';
import { map } from 'rxjs/operators';

const observable = from([1, 2, 3, 4, 5]);

const promise = observable.pipe(
  map(value => value * 2)
).toPromise();

promise.then(result => {
  console.log(result); // 输出：[2, 4, 6, 8, 10]
});

import { from } from 'rxjs';
import { map } from 'rxjs/operators';

async function processData() {
  const observable = from([1, 2, 3, 4, 5]);

  const result = await observable.pipe(
    map(value => value * 2)
  ).toPromise();

  console.log(result); // 输出：[2, 4, 6, 8, 10]
}

processData();