JS传wav文件给后台

<button id="recordButton">开始录制</button>

let recordButton = document.getElementById('recordButton');
            let mediaRecorder;  //媒体实例
            let chunks = [];//语音文件
            let isRecording = false;//是正在录制还是停止录制

            recordButton.addEventListener('click', () => {
                if (!isRecording) {
				    chunks = []; // 清空数组
                    navigator.mediaDevices.getUserMedia({ audio: true })
                        .then(stream => {
                            mediaRecorder = new MediaRecorder(stream);
                            mediaRecorder.start();

                            mediaRecorder.ondataavailable = (e) => {
                                chunks.push(e.data);
                            };

                            mediaRecorder.onstop = (e) => {
                                let blob = new Blob(chunks, { 'type' : 'audio/wav' });

                                // 创建一个 FormData 对象
                                let formData = new FormData();
                                // 添加录音文件
                                formData.append('audio_file', blob, 'audio.wav');

                                // 使用 fetch API 发送录音文件
                                // url 为请求的路径
                                const response = fetch(url, {
                                    method: 'POST',
                                    body: formData
                                })
                                .then(response => response.json())
                                .then(data => console.log(data))
                                .catch(error => console.error('Error:', error));
                            };
                        })
                        .catch(err => console.log('Error: ', err));
                    recordButton.textContent = '结束录制';
                    isRecording = true;
                } else {
                    mediaRecorder.stop();
                    recordButton.textContent = '开始录制';
                    isRecording = false;
                }
            });

同理，上传文件给后台原理相同。