在Web浏览器中,直接使用MediaRecorder录制来自window.speechSynthesis(文本转语音)的音频流并不是一件直接的事情,因为MediaRecorder通常用于录制来自麦克风、摄像头或屏幕的媒体流,而window.speechSynthesis并不提供音频流接口。
但是可以通过屏幕录制getDisplayMedia实现,录制的时候选择整个屏幕,勾选同时分享系统音频。

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<title>BFW NEW PAGE</title>
<style>
</style>
</head>
<body>
<button id="start">开始录制</button>
<button id="stop" disabled>停止并下载</button>
<script>
const startBtn = document.getElementById('start');
const stopBtn = document.getElementById('stop');
let mediaRecorder, audioChunks = [];
startBtn.onclick = async () => {
// 请求屏幕+音频捕获权限
const stream = await navigator.mediaDevices.getDisplayMedia({
audio: true
});
// 播放语音
const utterance = new SpeechSynthesisUtterance('正在录制我的声音');
window.speechSynthesis.speak(utterance);
// 开始录制
mediaRecorder = new MediaRecorder(stream);
mediaRecorder.ondataavailable = e => audioChunks.push(e.data);
mediaRecorder.start();
startBtn.disabled = true;
stopBtn.disabled = false;
};
stopBtn.onclick = () => {
mediaRecorder.stop();
startBtn.disabled = true;
stopBtn.disabled = false;
mediaRecorder.onstop = () => {
const blob = new Blob(audioChunks, { type: 'audio/webm' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'captured-speech.webm';
a.click();
audioChunks = [];
};
};
</script>
</body>
</html>
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