Function.createCallback在FireFox中没有正确传递上下文

问题描述

我发现了MS AJAX库如何与FireFox交互，似乎是一个错误 - 但也许我只是做错了。我有一个看起来像这样的脚本：

  dowork（{value：some value，currentRetry：0} ）; 
 
 //尝试连接至少10次，在第二次重试之间。
 function dowork（request）{
 if（request.currentRetry< 10） {
 logMessage（'currentRetry ='+ request.currentRetry +'; 1秒后再次尝试。 
 request.currentRetry ++; 
 var callback = Function.createCallback（dowork，{value：request.context，currentRetry：request.currentRetry}）; 
 setTimeout（callback，1000）; 
} 
 else {
 logMessage（'Exceeded retries; currentRetry ='+ request.currentRetry）; 
} 
} 
  

换句话说，我想做某事这可能会定期失败，所以我想重试，说，10次，与之间的第二个。我可以弄清楚如何做到这一点的唯一方法是使用像AJAX库中的Function.createCallback位。

IE 8和Chrome 2，即它产生以下输出：

currentRetry = 0;

currentRetry = 1;

currentRetry = 2;

currentRetry = 3;在1秒后再次尝试。

currentRetry = 4;在1秒后再次尝试。

currentRetry = 5;

currentRetry = 6;

currentRetry = 7;

currentRetry = 8;

currentRetry = 9;

超过重试次数。然而，在FireFox（3.5预览，没有在其他口味测试），输出如下：

currentRetry = 0;在1秒内再次尝试。
超过重试次数; currentRetry = undefined

在解决方法或我做错了什么想法？

解决方案

好吧，我不知道与Function.createCallback有什么问题，但我能够通过使用匿名方法来修复它：

  var callback = function（）{dowork（request）}; 
 setTimeout（callback，1000）; 
  

足够接近政府工作。

I've discovered what seems to be a bug in how the MS AJAX library interacts with FireFox -- but maybe I'm just doing it wrong. I've got a script that looks something like this:

    dowork({ value: "some value", currentRetry: 0 });

    // Try to connect at least 10 times, with a second in-between retries..
    function dowork(request) {
        if (request.currentRetry < 10) {
            logMessage('currentRetry = ' + request.currentRetry + '; trying again in 1 second.');
            request.currentRetry++;
            var callback = Function.createCallback(dowork, { value: request.context, currentRetry: request.currentRetry });
            setTimeout(callback, 1000);
        }
        else {
            logMessage('Exceeded retries; currentRetry = ' + request.currentRetry);
        }
    }

In other words, I'm trying to do something that's likely to fail periodically, so I want to retry, say, 10 times, with a second in-between. The only way I can figure out how to do this is by using something like the Function.createCallback bit from the MS Ajax library.

And this works correctly in, say, IE 8 and Chrome 2, i.e., it produces the following output:

currentRetry = 0; trying again in 1 second.
currentRetry = 1; trying again in 1 second.
currentRetry = 2; trying again in 1 second.
currentRetry = 3; trying again in 1 second.
currentRetry = 4; trying again in 1 second.
currentRetry = 5; trying again in 1 second.
currentRetry = 6; trying again in 1 second.
currentRetry = 7; trying again in 1 second.
currentRetry = 8; trying again in 1 second.
currentRetry = 9; trying again in 1 second.
Exceeded retries; currentRetry = 10

However, in FireFox (3.5 Preview, haven't tested it in other flavors), the output looks like this:

currentRetry = 0; trying again in 1 second.Exceeded retries; currentRetry = undefined

Any thoughts either on a workaround, or on what I'm doing wrong?

解决方案

Well, I don't know what the problem is with Function.createCallback, but I was able to fix it by using an anonymous method instead:

var callback = function () { dowork(request) }; 
setTimeout(callback, 1000);

Close enough for government work.

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