Question

我试图通过使用while循环查看每个HTTP请求之间的响应，但这导致我的浏览器异常反应，迫使我退出它。有人可以给我一些指示吗？我正在尝试发送“唤醒”命令，如果它处于睡眠状态，我会收到408错误，如果它处于唤醒状态，我会得到200 OK。我在想，也许我应该在每个http请求之间添加10秒钟的睡眠功能，但我认为没有像Python中那样简单的“睡眠”功能。

state = "asleep"
while (state === "asleep") {
     this.wakeUp(user).then(function (response) {
          if (response.status === 200):
              state = "awake";
      });
    }

wakeUpVehicle(user) {
    return new Promise(function(resolve) {
      fetch(url + "/wake_up", {
        method: "post",
        headers: {
          "Content-Type": "application/json",
          "Authorization": "Bearer " + access_token
        }
      })
      .then(res => res.json())
      .then(json => {resolve(json["response"])})
    });
  }

我将不胜感激！ :-)谢谢

Answer 1

没有简单的“睡眠”，但是您可以轻松地自己写：

 const timer = ms => new Promise(res => setTimeout(res, ms));

然后就这么简单：

 let state = "asleep"; // always declare variables!

 (async function polling() { // leave the synchronous track
   while(true) { // async infinite loops are not as bad as they might seem
     const response = await wakeUp(user);
     state = response.status ? "awake" : "asleep"; // not sure if this is what you wanted, edit according to your needs
     await timer(10 * 1000); // wait for 10secs before checking again
  }
})();

Javascript-如何等待10秒才能返回承诺？

1 个答案: