在Vue 项目中使用WebSocke与WaveSurferJS 实现一个聊天对话功能

created(){
 if (typeof WebSocket === 'undefined') {
  alert('您的浏览器不支持socket')
 } else {
  // 实例化socket
  this.socket = new WebSocket(this.socketServerPath)
  // 监听socket连接
  this.socket.onopen = this.open
  // 监听socket错误信息
  this.socket.onerror = this.error
  // 监听socket消息
  this.socket.onmessage = this.onMessage
  this.socket.onclose = this.close
 }
}
destroyed(){
 this.socket.close()
}

if (navigator.getUserMedia) {
  navigator.getUserMedia(
  { audio: true }, // 只启用音频
  function(stream) {
   var context = new(window.webkitAudioContext || window.AudioContext)()
   var audioInput = context.createMediaStreamSource(stream)
   var recorder = new Recorder(audioInput)

  },
  function(error) {
   switch (error.code || error.name) {
   case 'PERMISSION_DENIED':
   case 'PermissionDeniedError':
    throwError('用户拒绝提供信息。')
    break
   case 'NOT_SUPPORTED_ERROR':
   case 'NotSupportedError':
    throwError('浏览器不支持硬件设备。')
    break
   case 'MANDATORY_UNSATISFIED_ERROR':
   case 'MandatoryUnsatisfiedError':
    throwError('无法发现指定的硬件设备。')
    break
   default:
    throwError('无法打开麦克风。异常信息:' + (error.code || error.name))
    break
   }
  }
  )
 } else {
  throwError('当前浏览器不支持录音功能。')
 }

<div class="chat-list">
   <div v-for="(item,index) in chatList" :key="index" class="msg-wrapper">
    <chat-record ref="chatRecord" :data="item" @showJson="showJsonDialog"></chat-record>
   </div>
   <div id="msg_end" ></div>
  </div>
</div>

 this.recordTimer = setInterval(() => {
  this.audioDuration = this.audioDuration + 0.1
  }, 100)

 initWaveSurfer() {
  this.$nextTick(() => {
  this.wavesurfer = WaveSurfer.create({
   container: this.$refs.waveform,
   height: 20,
   waveColor: '#3d6fff',
   progressColor: 'blue',
   backend: 'MediaElement',
   mediaControls: false,
   audioRate: '1',
   fillParent: false,
   maxCanvasWidth: 500,
   barWidth: 1,
   barGap: 2,
   barHeight: 5,
   barMinHeight: 3,
   normalize: true,
   cursorColor: '#409EFF'
  })
  this.convertAudioToUrl(this.waveAudio).then((res) => {
   this.wavesurfer.load(res)

   setTimeout(() => {
   this.audioDuration = this.getAudioDuration()
   }, 100)
  })
  })
 },

 // 将音频转化成url地址
 convertAudioToUrl(audio) {
  let blobUrl = ''
  if (this.data.sendBy === 'self') {
  blobUrl = window.URL.createObjectURL(audio)
  return new Promise((resolve) => {
   resolve(blobUrl)
  })
  } else {
  return this.base64ToBlob({
   b64data: audio,
   contentType: 'audio/wav'
  })
  }
 },

 base64ToBlob({ b64data = '', contentType = '', sliceSize = 512 } = {}) {
  return new Promise((resolve, reject) => {
  // 使用 atob() 方法将数据解码
  let byteCharacters = atob(b64data)
  let byteArrays = []
  for (
   let offset = 0;
   offset < byteCharacters.length;
   offset += sliceSize
  ) {
   let slice = byteCharacters.slice(offset, offset + sliceSize)
   let byteNumbers = []
   for (let i = 0; i < slice.length; i++) {
   byteNumbers.push(slice.charCodeAt(i))
   }
   // 8 位无符号整数值的类型化数组。内容将初始化为 0。
   // 如果无法分配请求数目的字节，则将引发异常。
   byteArrays.push(new Uint8Array(byteNumbers))
  }
  let result = new Blob(byteArrays, {
   type: contentType
  })
  result = Object.assign(result, {
   // 这里一定要处理一下 URL.createObjectURL
   preview: URL.createObjectURL(result),
   name: `XXX.wav`
  })
  resolve(window.URL.createObjectURL(result))
  })
 },

<div class="audio-player">
   <svg-icon v-if="!isPlaying" icon-class='play' @click="onClickAudioPlayer" />
   <svg-icon v-else icon-class='pause' @click="onClickAudioPlayer" />
   <audio :src="playAudioUrl" autostart="true" hidden="true" ref="audioPlayer" />
  </div>

 onClickAudioPlayer() {
  if (this.isPlaying) {
  this.$refs.audioPlayer.pause()
  this.isPlaying = false
  } else {
  // 每次点击时，开始播放，并在播放完毕将isPlaying置为false
  this.$refs.audioPlayer.currentTime = 0
  this.$refs.audioPlayer.play()
  this.isPlaying = true

  setTimeout(() => {
   // 将正在播放重置为false
   this.isPlaying = false
  }, Math.ceil(this.$refs.audioPlayer.duration) * 1000)
  }
 },