A project from JavaScript 30 -23

1. 文字转语音的简化步骤

   const msg = new SpeechSynthesisUtterance();
   msg.text = "hello";
   speechSynthesis.speak(msg);

2. 更改语言

   // 接上
   let voices;
   voices = speechSynthesis.getVoices();
   // 如果直接写let voices=speechSynthesis.getVoices()会得到空数组，为什么？
   msg.text = "您好";
   msg.voice = voices.find((voice) => voice.lang === "zh-CN");
   speechSynthesis.speak(msg);

3. 设置msg.rate, msg.pitch可更改语音的速度和音高
4. array.find()只返回第一个符合条件的元素
5. 向回调函数传递参数可以使用bind, egele.addEventListener('click',toggle.bind(null,false)) is the same as ele.addEventListener('click',()=>toggle(false)) and ele.addEventListener('click',function(){toggle(false)}
6. global variable 既可以直接在 js 中使用，也可以在前面加上window., 如 window.speechSythesis or just speechSythesis

• MDN - SpeechSythesisUtterance