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window.speechSynthesis文字转声音如何下载音频文件?

请问window.speechSynthesis文字转声音如何下载音频文件?

比如下面这段在浏览器中文字转语音的代码,如何转变成音频下载到本地呢?

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

</head>
<body>

    <script>
        var utterThis = new window.SpeechSynthesisUtterance('您的余额不足,请及时充值');
        utterThis.pitch=1
        utterThis.rate=0.6
        utterThis.voiceURI='BaiduMandarinMale'
        window.speechSynthesis.speak(utterThis);
    </script>
</body>
</html>



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