HarmonyOS 数组耗时操作按顺序执行？

Question

这边有一个图片数组，包含图片123，需要先按顺序把图片传给服务器，等所有图片传递完后，再显示成功视图。想请教下如何保证图片传递顺序，即图1传完后传图2，完后再传图3，最后显示成功视图。

Answer 1

可以使用串行队列，参考：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-taskpool-V5\#execute11

@Concurrent
function additionDelay(delay:number): void {
  let start: number = new Date().getTime();
  while (new Date().getTime() - start < delay) {
    continue;
  }
}
@Concurrent
function waitForRunner(finalString: string): string {
  return finalString;
}
async function seqRunner()
{
  let finalString:string = "";
  let task1:taskpool.Task = new taskpool.Task(additionDelay, 3000);
  let task2:taskpool.Task = new taskpool.Task(additionDelay, 2000);
  let task3:taskpool.Task = new taskpool.Task(additionDelay, 1000);
  let task4:taskpool.Task = new taskpool.Task(waitForRunner, finalString);
  let runner:taskpool.SequenceRunner = new taskpool.SequenceRunner();
  runner.execute(task1).then(() => {
    finalString += 'a';
    console.info("seqrunner: task1 done.");
  });
  runner.execute(task2).then(() => {
    finalString += 'b';
    console.info("seqrunner: task2 done");
  });
  runner.execute(task3).then(() => {
    finalString += 'c';
    console.info("seqrunner: task3 done");
  });
  await runner.execute(task4);
  console.info("seqrunner: task4 done, finalString is " + finalString);
}