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