Javascript-如何等待10秒才能返回承諾？

Question

我試圖通過使用while循環查看每個HTTP請求之間的響應，但這會導致瀏覽器異常運行，並迫使我退出它。 有人可以給我一些指示嗎？ 我正在嘗試發送“喚醒”命令，如果它處於睡眠狀態，我會收到408錯誤，如果它處於喚醒狀態，我會得到200 OK。 我在想，也許我應該在每個http請求之間添加10秒鍾的睡眠功能，但我不認為有像Python中那樣的簡單“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"])})
    });
  }

我將不勝感激任何幫助！ ：-） 謝謝

Answer 1

沒有簡單的“睡眠”，但是您可以輕松地自己寫：

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

然后就這么簡單：

 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
  }
})();