Do you know the Deferred and the recursion limit? There is a good example below, you can take a look
function runAsyncTTS(text,speecher,audiopath) { var def = jQuery.Deferred(); var args = {"SynthText": text, "VoiceSpeecer": speecher, "WordSpeed": "3", "UseCSSML": "0", "AudioPath": audiopath}; tts.asyncTTS(JSON.stringify(args),function(err,result) { def.resolve(result); }); return def.promise(); } function textToSpeechBat(metaJson, speecher, audioPath) { var def = $.Deferred(); var result = {originalWords:"", resultJsonArr:[]}; var jsons=""; for(var index=0;index < metaJson.words.length;index++) { var audioName = metaJson.words[index]['audio']; audioName = audioName.replace('.mp3',''); var audioFile = audioPath +"/" + audioName + '.wav'; var args = '{"SynthText": "'+metaJson.words[index]['word']+'", "VoiceSpeecer": "'+speecer+'", "WordSpeed": "3", "UseCSSML": "0", "AudioPath": "'+audioFile+'"}'; jsons += args + "|"; } jsons = jsons.substr(0,jsons.length-1); tts.asyncTTSBat(jsons,function(err,ret) { result['resultJsonArr'] = ret.split('|'); def.resolve(result); }); return def.promise(); } function textToSpeechWithTryTimes(metaJson, speecher, audioPath, times) { var def = $.Deferred(); var ttsRet = null; var ttsCallBack = function(index) { if(index < times) { textToSpeechBat(metaJson, speecher, audioPath).done(function (ret) { console.log("textToSpeechWithTryTimes:"+JSON.stringify(ret)); ttsRet = ret; var resultJsonArr = ret.resultJsonArr; var audioFlag = true; for(var i=0;i<resultJsonArr.length;i++) { if(resultJsonArr[i] == "") { audioFlag = false; break; } var retObj = JSON.parse(resultJsonArr[i]); console.log(retObj['audioFlag']); if(retObj['audioFlag'] == 'false' || retObj['result']=="") { audioFlag = false; break; } } console.log(audioFlag); if(audioFlag == false) { console.log("textToSpeechWithTryTimes Fail, try again!"); ttsCallBack(++index); }else { console.log("textToSpeechWithTryTimes successe,return"); def.resolve(ret); } }); } if(index == times) { console.log("textToSpeechWithTryTimes timesover,return"); def.resolve(ttsRet); } }; ttsCallBack(0); return def.promise(); }