从外在承诺到内在承诺的传播拒绝

如果达到超时,如何停止参数中传递的承诺的操作?

don't have cancellation of async functions yet .

承诺是一种价值,而不是一种行动 ,一旦您得到了给定的承诺,我们在JavaScript中就不会有可取消的承诺,因此不可能取消操作。

你唯一能做的就是 the cancellation proposal 写下你的 longRunningFunction 使用令牌:

function longRunningFunction() {
   const signal = { requested: false };
   async function internal() {
     // your regular code here
     // whenever you can stop execution:
     if(signal.requested) {
       return; // and cancel internal operations
     }
   }
   let res = internal();
   res.signal = signal;
   return res;
}

然后写下你的种族:

export const promiseTimeout = (
  promise,
  timeoutMs = 10000, //10 secs
  message = 'Timeout reached, please try again',
) =>
  Promise.race([
    promise,
    new Promise((resolve, reject) =>
      setTimeout(() => {
        reject(message);
        if (promise.signal) promise.signal.requested = true;
      }, timeoutMs),
    ),
  ]);