window.speechSynthesis.speak(new window.SpeechSynthesisUtterance('你好,世界!'))
* 可以复制到控制台试听效果
更多资料请见:
https://www.zhangxinxu.com/wordpress/2017/01/html5-speech-recognition-synthesis-api/
https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance/SpeechSynthesisUtterance