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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <span>123123</span>
</body>
</html>

<script>
  const synth = window.speechSynthesis;
  let utterThis = new SpeechSynthesisUtterance();
  utterThis.volume = 1; // 声音的音量 范围是0到1
  utterThis.rate = 0.7; //语速，数值，默认值是1，范围是0.1到10
  function AddVoice(text) {
    let utterance = new SpeechSynthesisUtterance(text);
    synth.speak(utterance);
  }
  AddVoice("您有新的消息,请注意查收")
</script>