的NodeJS setTimeout函數

Question

我不知道如何使用setTimeout函數中的NodeJS。假設我想要：

1. 函數A（）每10秒調用一次。
2. 如果一個函數的從價值回調返回結果「真」，它會調用一個URL和DONE！
3. 如果函數A keep返回值爲'false'的回調的結果，則保持呼叫，直到它收到'YES'達10分鐘
4. 如果達到10分鐘最大值並且仍然沒有'true'結果，最後返回「假」

你怎麼做，在Node.js的請！

Answer 1

簡單的例子（可能需要調整）

var timed_out = false, 
    timer  = setTimeout(function() { 
     timed_out = true; 
    }, (1000*60*10)); // ten minutes passed 


function A() { 
    call_func(function(result) { // call func with callback 
     if (result) { 
      clearTimeout(timer); 
      DONE(); 
     }else if (! timed_out) { 
      setTimeout(A, 10000); // call again in 10 seconds 
     } 
    }); 
} 

Answer 2

var tenMinutes = false; // my boolean to test the 10 minutes 
setTimeout(function() { tenMinutes = true; }, 600000); // a timeout to set the boolean to true when the ten minutes are gone 

function A() { 
    $.ajax({ 
     url: "myURL", 
     method: "POST", 
     data: {}, 
     success: function(myBool) { 
      if (!myBool && !tenMinutes) { // if false, and not ten minutes yet, try again in ten seconds 
       setTimeout(A, 10000); 
      } 
      else if (!myBool && tenMinutes) { // else, if still false, but already passed ten minutes, calls the fail function (simulates the return false) 
       myFailresponse(); 
      } 
      else { // if the AJAX response is true, calls the success function (simulates the return true) 
       mySuccessResponse(); 
      } 
     } 
    }); 
} 

function mySuccessResponse() { 
    // you've got a "return true" from your AJAX, do stuff 
} 

function myFailResponse() { 
    // you've lots of "return false" from your AJAX for 10 minutes, do stuff 
} 

A(); // call the A function for the first time 

Answer 3

這裏的另一種方法。您可以使用setInterval定期調用該函數。如果你獲得成功，做成功的東西並取消計時器。否則，只需取消限制達到的時間。

function a(){ 
    console.log('a called'); 
    return false; 
} 

var doThing = (function() { 
    var start, 
     timeout, 
     delay = 1000, // 1 second for testing 
     limit = 10000; // 10 seconds for testing 
    return function() { 

     if (!start) { 
     start = new Date().getTime(); 
     timeout = setInterval(doThing, delay); 
     } 

     // Call a and tests return value 
     if (a()) { 

     // Do success stuff 

     // Set start to 0 so timer is cancelled 
     start = 0; 
     } 

     // stop timer if limit exceeded or start set to zero 
     if (new Date().getTime() > start + limit || !start) { 
     timeout && clearTimeout(timeout); 
     timeout = null; 
     start = null; 
     } 
    } 
}()); 

doThing();