h5文字转语音

speech(txt){

var synth = null;

var msg = null;

synth = window.speechSynthesis;

msg = new SpeechSynthesisUtterance();

msg.text = txt;

msg.lang = "zh-CN";

synth.speak(msg);

if(window.speechSynthesis.speaking){

  console.log("音效有效");

} else {

console.log("音效失效");

}

}