Detailed explanation of uni-app (vue) encapsulating a basic audio component based on InnerAudioContext

Related learning recommendations: WeChat Mini Program Development

## The reason

is also because the official mini program does not maintain the

audio component

Requirements and restrictions of audio components

1. Click to play or pause

2. Display the playback progress and total duration
3. Display the current audio status (paused/playing/loading) through icon changes
4. Refresh the component status when the page audio is updated
5. Global There is and only one audio in the playing state
6. Automatically stop playing and destroy the audio instance after leaving the page

Materials/Properties/Methods

Let’s get started

uni-app Vue

Similarly construct
• DOMstructure

<view class="custom-audio">
  <image v-if="audioSrc !== undefined && audioSrc !== null && audioSrc !== &#39;&#39;" @click="playOrStopAudio" :src="audioImg" class="audio-btn" />
  <text v-else @click="tips" class="audio-btn">无音源</text>
  <text>{{ fmtSecond(currentTime) }}/{{ fmtSecond(duration) }}</text></view>复制代码

Define accepted components

• props: {  audioSrc: {    type: String,    default: ''
    },
  },复制代码

Define the operations related to the initialization of the
• CustomAudio component, and add some behaviors to the callback of innerAudioContext (the pitfalls we stepped on in the previous Taro article will be directly coded here) )

import { formatSecondToHHmmss, afterAudioPlay, beforeAudioRecordOrPlay } from '../../lib/Utils'const iconPaused = '../../static/images/icon_paused.png'const iconPlaying = '../../static/images/icon_playing.png'const iconStop = '../../static/images/icon_stop.png'const iconLoading = '../../static/images/icon_loading.gif'// ...data() {  return {    audioCtx: null, // 音频上下文
    duration: 0, // 音频总时长
    currentTime: 0, // 音频当前播放的时长
    audioImg: iconLoading, // 默认状态为加载中
  }
},watch: {  audioSrc: {
    handler(newSrc, oldSrc) {      console.log('watch', newSrc, oldSrc)      this.audioImg = iconLoading      this.currentTime = 0
      this.duration = 0
      if (this.audioCtx === undefined) {        this.audioCtx = uni.createInnerAudioContext()        this.onTimeUpdate = this.audioCtx.onTimeUpdate        this.bindAuidoCallback(this.audioCtx)
      } else {        this.audioCtx.src = newSrc
      }      if (this.audioCtx.play) {        this.audioCtx.stop()
        getApp().globalData.audioPlaying = false
      }
    }
  }
},
mounted() {  this.audioCtx = uni.createInnerAudioContext()  this.audioCtx.src = this.audioSrc  this.audioCtx.startTime = 0
  this.bindAuidoCallback(this.audioCtx)
},methods: {
  bindAuidoCallback(ctx) {
    ctx.onTimeUpdate((e) => {      this.onTimeUpdate(e)
    })
    ctx.onCanplay((e) => {      this.onCanplay(e)
    })
    ctx.onWaiting((e) => {      this.onWaiting(e)
    })
    ctx.onPlay((e) => {      this.onPlay(e)
    })
    ctx.onPause((e) => {      this.onPause(e)
    })
    ctx.onEnded((e) => {      this.onEnded(e)
    })
    ctx.onError((e) => {      this.onError(e)
    })
  },
  tips(){
    uni.showToast({      title: '无效音源,请先录音',      icon: 'none'
    })
  },
  playOrStopAudio() {    if (this.audioCtx === null) {      this.audioCtx = uni.createInnerAudioContext()      this.audioCtx.src = this.audioSrc      this.bindAuidoCallback(this.audioCtx)
    }    if (this.audioCtx.paused) {      if (beforeAudioRecordOrPlay('play')) {        this.audioCtx.play()        this.audioImg = iconPlaying
      }
    } else {      this.audioCtx.pause()
      afterAudioPlay()      this.audioImg = iconPaused
    }
  },
  onTimeUpdate(e) {    console.log(&#39;onTimeUpdate&#39;, this.audioCtx.duration, this.audioCtx.currentTime)    if (this.audioCtx.currentTime > 0 && this.audioCtx.currentTime <= 1) {      this.currentTime = 1
    } else if (this.currentTime !== Math.floor(this.audioCtx.currentTime)) {      this.currentTime = Math.floor(this.audioCtx.currentTime)
    }    const duration = Math.floor(this.audioCtx.duration)    if (this.duration !== duration) {      this.duration = duration
    }
  },
  onCanplay(e) {    if (this.audioImg === iconLoading) {      this.audioImg = iconPaused
    }    console.log(&#39;onCanplay&#39;, e)
  },
  onWaiting(e) {    if (this.audioImg !== iconLoading) {      this.audioImg = iconLoading
    }
  },
  onPlay(e) {    console.log(&#39;onPlay&#39;, e, this.audioCtx.duration)    this.audioImg = iconPlaying    if (this.audioCtx.duration > 0 && this.audioCtx.duration <= 1) {      this.duration = 1
    } else {      this.duration = Math.floor(this.audioCtx.duration)
    }
  },
  onPause(e) {    console.log(&#39;onPause&#39;, e)    this.audioImg = iconPaused
  },
  onEnded(e) {    console.log(&#39;onEnded&#39;, e)    if (this.audioImg !== iconPaused) {      this.audioImg = iconPaused
    }
    afterAudioPlay()
  },
  onError(e) {
    uni.showToast({      title: &#39;音频加载失败&#39;,      icon: &#39;none&#39;
    })    throw new Error(e.errMsg, e.errCode)
  },
  fmtSecond(sec) {    const { min, second } = formatSecondToHHmmss(sec)    return `${min}:${second}`
  }
},复制代码

Same

scssfile

<style lang="scss" scoped>.custom-audio {  border-radius: 8vw;  border: #CCC 1px solid;  background: #F3F6FC;  color: #333;  display: flex;  flex-flow: row nowrap;  align-items: center;  justify-content: space-between;  padding: 2vw;  font-size: 14px;
  .audio-btn {    width: 10vw;    height: 10vw;    white-space: nowrap;    display: flex;    align-items: center;    justify-content: center;
  }
}
</style>复制代码

Finally

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