JavaScript执行超时 [英] JavaScript execution exceeded timeout

问题描述

在Safari中的iPad iOS 5上，一切正常，直到我添加了这段代码：

  var watchID = navigator.geolocation.watchPosition（updatePos，locationError，{maximumAge：10000，frequency：60000，enableHighAccuracy：true ，timeout：1000}）; 
 
 function updatePos（position）{
 if（position.coords.accuracy< accuracyThreshold）{
 $ .post（websiteRoot +'/ ReportDeviceLocation？rand ='+（Math .random（）* Math.random（））+'& longitude ='+ position.coords.longitude +'&; latitude ='+ position.coords.latitude）; 
 $ b} else {
 console.debug（位置数据不够准确，位置未更新。）; 
 
 
  

然后，网页工作了大约4分钟，我得到这个错误：

JavaScript执行超时超时。 p>然后不加载JavaScript。我插入到my.js文件中的调试消息都不会打印。只有上面的错误。即使在我离开产生这个错误的页面，并在同一个域下打开其他网页之后，该错误仍然存​​在。

我使用了try和catch，我使用了setTimeout函数，但是既没有给我提供错误的根源，也没有解决问题。

>

我不知道问题出在哪里。它一直在燃烧我整整一天，并将在周末燃烧我。

解决方案

令人惊讶的是，当我使用 geolocation.getCurrentPosition ，错误消息停止显示。
要用getCurrentPosition替换watchPosition，我使用函数 setInterval ：

  function getLocation（）{
 navigator.geolocation.getCurrentPosition（updatePos，locationError，{enableHighAccuracy：true，timeout：10000}）; 
} 
 
 var intervalID = window.setInterval（getLocation，10000）; 
  

这比watchPosition更好，因为watchPosition有时不遵循规则（在3中更新位置8次如果超时仍然发生，则需要调用clearInterval：

  var geolocationID; 
（function getLocation（）{
 var count = 0; 
 geolocationID = window.setInterval（
 function（）{
 count ++; 
 if（count > 3）{//计数达到数字时，重置间隔
 window.clearInterval（geolocationID）; 
 getLocation（）; 
} else {
 navigator.geolocation.getCurrentPosition （updatePos，locationError，{enableHighAccuracy：true，timeout：10000}）; 
} 
}，
 600000）; // end setInterval; 
}）（）; 
  

1. I am not doing a large chunk of computation in JS.

2. Everything works fine on iPad iOS 5 in Safari until I added this code:

   var watchID = navigator.geolocation.watchPosition(updatePos,locationError,{maximumAge: 10000, frequency: 60000, enableHighAccuracy: true, timeout: 1000});
   
   function updatePos(position) {       
       if (position.coords.accuracy < accuracyThreshold) {                 
           $.post(websiteRoot + '/ReportDeviceLocation?rand=' + (Math.random() * Math.random()) + '&longitude=' + position.coords.longitude + '&latitude=' +position.coords.latitude);
   
       } else {
           console.debug("Location data is not accurate enough. Location not updated.");
       }
   }
   

3. Then the web page worked for about 4 minutes and I get this error:

   JavaScript execution exceeded timeout.

4. Then no JavaScript would load. None of the debug messages I inserted into my.js file would print. Only the above error.

5. The error persists even after I left the page that generated this error, and opened other web pages under the same domain.

6. I used try and catch, I used setTimeout function, but neither gave me the source of the error nor solved the problem.

I don't know what the problem is. It has been burning me for the entire day and will be burning me for the weekend.

解决方案

Surprisingly, when I used geolocation.getCurrentPosition, the error message stopped showing up. To replace watchPosition with getCurrentPosition, I use the function setInterval:

        function getLocation() {
            navigator.geolocation.getCurrentPosition(updatePos, locationError, { enableHighAccuracy: true, timeout: 10000 });
        }

        var intervalID = window.setInterval(getLocation, 10000);

This has worked out better than watchPosition because watchPosition sometimes does not follow rules(update location 8 times in 3 minutes despite the frequency is set to 10 minutes).

If the timeout still occurs, one would need to call clearInterval:

var geolocationID;
(function getLocation() {
     var count = 0;
     geolocationID = window.setInterval(
       function () {
            count++;
            if (count > 3) {  //when count reaches a number, reset interval
                window.clearInterval(geolocationID);
                getLocation();
            } else {
                navigator.geolocation.getCurrentPosition(updatePos, locationError, { enableHighAccuracy: true, timeout: 10000 });
            }
        },
        600000); //end setInterval;
})();

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