代碼不等待回調函數完成

我是JavaScript的新手，來自Java並希望編寫一個類似於Java方法的函數。問題是調用的代碼不等待被調用的函數完成，只是繼續發生什麼發生錯誤。我希望你明白我在說什麼。也許你可以幫我代碼不等待回調函數完成

if (Titanium.Facebook.loggedIn) { 
     // User is not logged in with his ACS Account but with its Facebook Account 
     // now we can check if he has an ACS Account with the same eMail Address 
     Titanium.API.info('User seems to be logged in to Facebook'); 

     gFacebookAccount = gFacebookController.getLoggedInFacebookAccount(); 
     Titanium.API.info('Logged In Facebook Account is : '+ gFacebookAccount); }

被調用的getLoggedInFacebookAccount看起來像這樣。我試圖通過超時循環延遲方法什麼不工作。

exports.getLoggedInFacebookAccount = function() 
{ 
Titanium.API.info('Started getLoggedInFacebookAccount'); 
var lCallBackFinished = false; 
var lActualUser = null; 
Titanium.Facebook.requestWithGraphPath('me', {}, 'GET', handleGraphRequestCallback); 

waitForQueryCallback(); 


function waitForQueryCallback() { 
    if (!lCallBackFinished) { 
     Titanium.API.info('Wait for Query Callback Loop'); 
     setTimeout(waitForQueryCallback, 100); 
     // 
    } 
    else 
    { 
     return lActualUser; 
    } 
} 


function handleGraphRequestCallback(pGraphCallback) { 

// damn callbacks - now here the user is logged in 
// and the Graph Request is (sucessfully or not) finished 

Titanium.API.info('Start handleGraphRequest-Callback'); 
if (pGraphCallback.success) { 
    Titanium.API.info('Graph Request Callback Sucessful'); 
    lActualUser = pGraphCallback.result; 

} else { 
    Titanium.API.info('Graph Request Callback Not Sucessful'); 

} 

lCallBackFinished = true; 

} 

}

控制檯輸出是：行的

[INFO][TiAPI ( 301)] User seems to be logged in to Facebook 
[INFO][TiAPI ( 301)] Started getLoggedInFacebookAccount 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][TiAPI ( 301)] Logged In Facebook Account is : undefined 
[INFO][TiAPI ( 301)] Function called 
[ERROR][TiJSError( 301)] (main) [214,2413] ----- Titanium Javascript Runtime Error ----- 
[ERROR][TiJSError( 301)] (main) [0,2413] - In undefined:1,1 

[ERROR][TiJSError( 301)] (main) [0,2413] - Message: Uncaught SyntaxError: Unexpected token u 
[ERROR][TiJSError( 301)] (main) [1,2414] - Source: undefined 
[ERROR][V8Exception( 301)] Exception occurred at undefined:1: Uncaught SyntaxError: Unexpected token u 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][TiRootActivity( 301)] (main) [0,0] checkpoint, on root activity resume. activity = [email protected] 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][ARMAssembler( 60)] generated scanline__00000077:03515104_00000000_00000000 [ 33 ipp] (47 ins) at [0x3666d0:0x36678c] in 4662744 ns 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][ActivityManager( 60)] Displayed activity de.dosofun.knowitall/.Knowitall2Activity: 5509 ms (total 5509 ms) 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][TiAPI ( 301)] Wait for Query Callback Loop 
[INFO][TiAPI ( 301)] Start handleGraphRequest-Callback 
[INFO][TiAPI ( 301)] Graph Request Callback Sucessful

原因：[INFO] [TiAPI（301）]中記錄的Facebook帳戶是：未定義你可以看到，碼犯規等到所謂的方法就完成了。

什麼是必要的，這樣我的代碼工作想，如果我的代碼是非常糟糕的，有什麼更好的方法（這是不是混亂的閱讀）

感謝您的幫助

來源

2012-07-22 dadom85

它是否直接返回'lActualUser'？ – 2012-07-22 08:42:51

wait_var = waitForQueryCallback(); 
YOU ARE NOT HANDLING THE RETURN FROM waitForQueryCallback() here... 

function waitForQueryCallback() { 
if (!lCallBackFinished) { 
    Titanium.API.info('Wait for Query Callback Loop'); 
    setTimeout(waitForQueryCallback, 100); 
    // 
    RETURN SOMETHING HERE? 
} 
else 
{ 
    return lActualUser; 
} 
}

嘗試並處理來自waitForQueryCallback（）的wait_var，並在回調未完成時返回一些內容。

來源

2012-07-22 08:46:07

代碼不等待回調函數完成

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