fix: 优化移动端朗读语音加载与语言匹配

speech.js

@@ -1,32 +1,72 @@
-function initSpeech() {
+var speechVoices = [];
+var speechVoicesLoaded = false;
+
+function refreshSpeechVoices() {
   if (!window.speechSynthesis) return;
   var voices = window.speechSynthesis.getVoices();
-  if (voices.length > 0) return;
-  window.speechSynthesis.onvoiceschanged = function() {};
-}
-
-function speakText(text, lang) {
-  if (!text) return;
-  if (!window.speechSynthesis) { return; }
-  if (window.speechSynthesis.getVoices().length === 0) {
-    window.speechSynthesis.onvoiceschanged = function() {
-      doSpeak(text, lang);
-      window.speechSynthesis.onvoiceschanged = null;
-    };
-    window.speechSynthesis.getVoices();
-    return;
+  if (voices && voices.length) {
+    speechVoices = voices;
+    speechVoicesLoaded = true;
   }
-  doSpeak(text, lang);
+  return speechVoices;
 }
 
-function doSpeak(text, lang) {
-  window.speechSynthesis.cancel();
+function pickSpeechVoice(lang) {
+  refreshSpeechVoices();
+  var target = lang.toLowerCase();
+  var exact = speechVoices.find(function(voice) {
+    return String(voice.lang || '').toLowerCase() === target;
+  });
+  if (exact) return exact;
+  var prefix = target.split('-')[0];
+  return speechVoices.find(function(voice) {
+    return String(voice.lang || '').toLowerCase().split('-')[0] === prefix;
+  }) || null;
+}
+
+function buildSpeechUtterance(text, lang) {
   var utterance = new SpeechSynthesisUtterance(text);
   var langMap = { 'es': 'es-ES', 'en': 'en-US', 'zh': 'zh-CN' };
   utterance.lang = langMap[lang] || lang;
+  var voice = pickSpeechVoice(utterance.lang);
+  if (voice) utterance.voice = voice;
   utterance.rate = 0.9;
   utterance.pitch = 1;
-  window.speechSynthesis.speak(utterance);
+  return utterance;
+}
+
+function doSpeak(text, lang) {
+  if (!window.speechSynthesis || !text) return;
+  window.speechSynthesis.cancel();
+  window.speechSynthesis.speak(buildSpeechUtterance(text, lang));
+}
+
+function speakText(text, lang) {
+  if (!text || !window.speechSynthesis) return;
+  refreshSpeechVoices();
+  if (speechVoicesLoaded) {
+    doSpeak(text, lang);
+    return;
+  }
+
+  var attempts = 0;
+  var timer = setInterval(function() {
+    attempts++;
+    refreshSpeechVoices();
+    if (speechVoicesLoaded || attempts >= 8) {
+      clearInterval(timer);
+      doSpeak(text, lang);
+    }
+  }, 80);
+  window.speechSynthesis.getVoices();
+}
+
+function initSpeech() {
+  if (!window.speechSynthesis) return;
+  refreshSpeechVoices();
+  window.speechSynthesis.onvoiceschanged = function() {
+    refreshSpeechVoices();
+  };
 }
 
 if (document.readyState === 'complete') initSpeech();