javascript - Marko 中的多个承诺

Question

在 Marko 中，一个多个 promise 如何<await>并行？

例如，我正在寻找这样的东西：

<await(promise1, promise2)>
  <@then|result1, result2|>
    promise1 and promise2 are resolved in parallel
    ${result1} renders whenever it is ready.
    ${result2} renders whenever it is ready.
  </@then>
</await>

Answer 1

You can use Promise.all to accomplish this.

<await(Promise.all([promise1, promise2]))>
  <@then|[result1, result2]|>
    promise1 and promise2 are resolved in parallel
    ${result1} renders whenever it is ready.
    ${result2} renders whenever it is ready.
  </@then>
</await>

This would run the @then block once all of the promises have finished.

Answer 2

除了@Piercey4 的回复之外，我还要补充一点，如果您有多个标签，它们会并行运行，因此如果您不需要将结果放在一起，您可以将它们分开包装：

promise1 and promise2 are resolved in parallel

<await(promise1)>
  <@then|result1|>
    ${result1} renders whenever it is ready.
  </@then>
</await>

<await(promise2)>
  <@then|result2|>
    ${result2} renders whenever it is ready.
  </@then>
</await>

使用默认（按顺序）刷新，promise2将与 并行评估和呈现promise1，但如果promise1尚未完成，内容将被缓冲以保留 HTML 源顺序。但是，如果内容先完成，这将允许内容promise1更早到达。