[es 6]js文字转语音

<textarea id="textArea" name="" id="" cols="30" rows="10"></textarea>
<div onclick="playVoice()">点击发声</div>

function isIe() {
            if (!!window.ActiveXObject || "ActiveXObject " in window) {
                return true
            } else {
                return false
            }
        }
        function playVoice() {
            console.log('点击成功')
            let msg = document.getElementById('textArea').value;
            console.log(isIe())
            window.speechSynthesis.cancel()
            if (isIe()) {
                let voiceObj = new ActiveXObject("Sapi.SpVoice")
                voiceObj.Rate = -1
                voiceObj.Volume = 60
                voiceObj.Speak(msg, 1)
            } else {
                let speakMsg = new SpeechSynthesisUtterance(msg)
                speakMsg.rate = 1;
                speakMsg.pitch = 1.5;
                window.speechSynthesis.speak(speakMsg)
            }
        }