废话不说，直接上代码吧
<!DOCTYPE html><html><head> ???<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> ???<title>火星黑洞</title></head><body> ???<div> ???????<audio autoplay></audio> ???????<input onclick="startRecording()" type="button" value="录音" /> ???????<input onclick="stopRecording()" type="button" value="停止" /> ???????<input onclick="playRecording()" type="button" value="播放" /> ???????<input onclick="uploadAudio()" type="button" value="提交" /> ???</div> ???<script type="text/javascript" src="HZRecorder.js"></script> ???<script> ???????var recorder; ???????var audio = document.querySelector(‘audio‘); ???????function startRecording() { ???????????HZRecorder.get(function (rec) { ???????????????recorder = rec; ???????????????recorder.start(); ???????????}); ???????} ???????function stopRecording() { ???????????recorder.stop(); ???????} ???????function playRecording() { ???????????recorder.play(audio); ???????} ???????function uploadAudio() { ???????????recorder.upload("Handler1.ashx", function (state, e) { ???????????????switch (state) { ???????????????????case ‘uploading‘: ???????????????????????//var percentComplete = Math.round(e.loaded * 100 / e.total) + ‘%‘; ???????????????????????break; ???????????????????case ‘ok‘: ???????????????????????//alert(e.target.responseText); ???????????????????????alert("上传成功"); ???????????????????????break; ???????????????????case ‘error‘: ???????????????????????alert("上传失败"); ???????????????????????break; ???????????????????case ‘cancel‘: ???????????????????????alert("上传被取消"); ???????????????????????break; ???????????????} ???????????}); ???????} ???</script></body></html>HZRecorder.js
(function (window) { ???//兼容 ???window.URL = window.URL || window.webkitURL; ???navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia; ???var HZRecorder = function (stream, config) { ???????config = config || {}; ???????config.sampleBits = config.sampleBits || 8; ?????//采样数位 8, 16 ???????config.sampleRate = config.sampleRate || (44100 / 6); ??//采样率(1/6 44100) ???????var context = new (window.webkitAudioContext || window.AudioContext)(); ???????var audioInput = context.createMediaStreamSource(stream); ???????var createScript = context.createScriptProcessor || context.createJavaScriptNode; ???????var recorder = createScript.apply(context, [4096, 1, 1]); ???????var audioData = { ???????????size: 0 ?????????//录音文件长度 ???????????, buffer: [] ????//录音缓存 ???????????, inputSampleRate: context.sampleRate ???//输入采样率 ???????????, inputSampleBits: 16 ??????//输入采样数位 8, 16 ???????????, outputSampleRate: config.sampleRate ???//输出采样率 ???????????, oututSampleBits: config.sampleBits ??????//输出采样数位 8, 16 ???????????, input: function (data) { ???????????????this.buffer.push(new Float32Array(data)); ???????????????this.size += data.length; ???????????} ???????????, compress: function () { //合并压缩 ???????????????//合并 ???????????????var data = new Float32Array(this.size); ???????????????var offset = 0; ???????????????for (var i = 0; i < this.buffer.length; i++) { ???????????????????data.set(this.buffer[i], offset); ???????????????????offset += this.buffer[i].length; ???????????????} ???????????????//压缩 ???????????????var compression = parseInt(this.inputSampleRate / this.outputSampleRate); ???????????????var length = data.length / compression; ???????????????var result = new Float32Array(length); ???????????????var index = 0, j = 0; ???????????????while (index < length) { ???????????????????result[index] = data[j]; ???????????????????j += compression; ???????????????????index++; ???????????????} ???????????????return result; ???????????} ???????????, encodeWAV: function () { ???????????????var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate); ???????????????var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits); ???????????????var bytes = this.compress(); ???????????????var dataLength = bytes.length * (sampleBits / 8); ???????????????var buffer = new ArrayBuffer(44 + dataLength); ???????????????var data = new DataView(buffer); ???????????????var channelCount = 1;//单声道 ???????????????var offset = 0; ???????????????var writeString = function (str) { ???????????????????for (var i = 0; i < str.length; i++) { ???????????????????????data.setUint8(offset + i, str.charCodeAt(i)); ???????????????????} ???????????????} ???????????????// 资源交换文件标识符 ????????????????writeString(‘RIFF‘); offset += 4; ???????????????// 下个地址开始到文件尾总字节数,即文件大小-8 ????????????????data.setUint32(offset, 36 + dataLength, true); offset += 4; ???????????????// WAV文件标志 ???????????????writeString(‘WAVE‘); offset += 4; ???????????????// 波形格式标志 ????????????????writeString(‘fmt ‘); offset += 4; ???????????????// 过滤字节,一般为 0x10 = 16 ????????????????data.setUint32(offset, 16, true); offset += 4; ???????????????// 格式类别 (PCM形式采样数据) ????????????????data.setUint16(offset, 1, true); offset += 2; ???????????????// 通道数 ????????????????data.setUint16(offset, channelCount, true); offset += 2; ???????????????// 采样率,每秒样本数,表示每个通道的播放速度 ????????????????data.setUint32(offset, sampleRate, true); offset += 4; ???????????????// 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8 ????????????????data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4; ???????????????// 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8 ????????????????data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2; ???????????????// 每样本数据位数 ????????????????data.setUint16(offset, sampleBits, true); offset += 2; ???????????????// 数据标识符 ????????????????writeString(‘data‘); offset += 4; ???????????????// 采样数据总数,即数据总大小-44 ????????????????data.setUint32(offset, dataLength, true); offset += 4; ???????????????// 写入采样数据 ????????????????if (sampleBits === 8) { ???????????????????for (var i = 0; i < bytes.length; i++, offset++) { ???????????????????????var s = Math.max(-1, Math.min(1, bytes[i])); ???????????????????????var val = s < 0 ? s * 0x8000 : s * 0x7FFF; ???????????????????????val = parseInt(255 / (65535 / (val + 32768))); ???????????????????????data.setInt8(offset, val, true); ???????????????????} ???????????????} else { ???????????????????for (var i = 0; i < bytes.length; i++, offset += 2) { ???????????????????????var s = Math.max(-1, Math.min(1, bytes[i])); ???????????????????????data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true); ???????????????????} ???????????????} ???????????????return new Blob([data], { type: ‘audio/wav‘ }); ???????????} ???????}; ???????//开始录音 ???????this.start = function () { ???????????audioInput.connect(recorder); ???????????recorder.connect(context.destination); ???????} ???????//停止 ???????this.stop = function () { ???????????recorder.disconnect(); ???????} ???????//获取音频文件 ???????this.getBlob = function () { ???????????this.stop(); ???????????return audioData.encodeWAV(); ???????} ???????//回放 ???????this.play = function (audio) { ???????????audio.src = window.URL.createObjectURL(this.getBlob()); ???????} ???????//上传 ???????this.upload = function (url, callback) { ???????????var fd = new FormData(); ???????????fd.append("audioData", this.getBlob()); ???????????var xhr = new XMLHttpRequest(); ???????????if (callback) { ???????????????xhr.upload.addEventListener("progress", function (e) { ???????????????????callback(‘uploading‘, e); ???????????????}, false); ???????????????xhr.addEventListener("load", function (e) { ???????????????????callback(‘ok‘, e); ???????????????}, false); ???????????????xhr.addEventListener("error", function (e) { ???????????????????callback(‘error‘, e); ???????????????}, false); ???????????????xhr.addEventListener("abort", function (e) { ???????????????????callback(‘cancel‘, e); ???????????????}, false); ???????????} ???????????xhr.open("POST", url); ???????????xhr.send(fd); ???????} ???????//音频采集 ???????recorder.onaudioprocess = function (e) { ???????????audioData.input(e.inputBuffer.getChannelData(0)); ???????????//record(e.inputBuffer.getChannelData(0)); ???????} ???}; ???//抛出异常 ???HZRecorder.throwError = function (message) { ???????alert(message); ???????throw new function () { this.toString = function () { return message; } } ???} ???//是否支持录音 ???HZRecorder.canRecording = (navigator.getUserMedia != null); ???//获取录音机 ???HZRecorder.get = function (callback, config) { ???????if (callback) { ???????????if (navigator.getUserMedia) { ???????????????navigator.getUserMedia( ???????????????????{ audio: true } //只启用音频 ???????????????????, function (stream) { ???????????????????????var rec = new HZRecorder(stream, config); ???????????????????????callback(rec); ???????????????????} ???????????????????, function (error) { ???????????????????????switch (error.code || error.name) { ???????????????????????????case ‘PERMISSION_DENIED‘: ???????????????????????????case ‘PermissionDeniedError‘: ???????????????????????????????HZRecorder.throwError(‘用户拒绝提供信息。‘); ???????????????????????????????break; ???????????????????????????case ‘NOT_SUPPORTED_ERROR‘: ???????????????????????????case ‘NotSupportedError‘: ???????????????????????????????HZRecorder.throwError(‘浏览器不支持硬件设备。‘); ???????????????????????????????break; ???????????????????????????case ‘MANDATORY_UNSATISFIED_ERROR‘: ???????????????????????????case ‘MandatoryUnsatisfiedError‘: ???????????????????????????????HZRecorder.throwError(‘无法发现指定的硬件设备。‘); ???????????????????????????????break; ???????????????????????????default: ???????????????????????????????HZRecorder.throwError(‘无法打开麦克风。异常信息:‘ + (error.code || error.name)); ???????????????????????????????break; ???????????????????????} ???????????????????}); ???????????} else { ???????????????HZRecorder.throwErr(‘当前浏览器不支持录音功能。‘); return; ???????????} ???????} ???} ???window.HZRecorder = HZRecorder;})(window);H5进行录音，播放，上传
原文地址：https://www.cnblogs.com/ldlx-mars/p/8490410.html