var speech = new SpeechSynthesisUtterance();
// 設置朗讀內容和屬性
speech.text = "你好";//播放文本
speech.volume = 1;//播放音量
speech.rate = 1; //播放語速
speech.pitch = 10;//音調高低
speechSynthesis.speak(speech);
瀏覽器限制
官網:https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis