js中语音播报

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  var msg = new SpeechSynthesisUtterance('订单货品已到齐');
    //msg.rate = 4 播放语速
    //msg.pitch = 10 音调高低
    //msg.text = "播放文本"
    //msg.volume = 0.5 播放音量
    window.speechSynthesis.speak(msg);