H5音频<audio/>自定义样式，拖拽、点击改变进度操作，总时长 during 加载

兼容性测试：

<audio/>标签样式修改

修改原因：

不同手机展示的样式不同，特别是IOS 和安卓区别很大，需要统一样式。

修改后样式：

修改理解：

1>“点击播放”和"点击暂停" 调用原生audio.play() 和audio.pause()来对进度条进行操作

2>总时长加载：解析 audio.duration 来获取总时长，会有部分浏览器兼容问题，下面列举部分兼容方式。

3>点击跳转进度：获取当前的 鼠标点击位置【e.pageX】 - 进度条.offsetLeft【相对于它的直接父元素 的 偏移量】，使用 translateX 改变 “蓝色小球”的播放进度位置。

4>拖拽跳转进度：监听 onTouchStart 、onTouchMove 和onTouchEnd

5> 目前缺点：

A.只有点击 进度条 才能跳转进度，建议扩大面积

B.拖拽需要松手的时候才有效果

C.部分 安卓 UC浏览器，不能愉快的加载时间，只能点击播放才能加载【已经做了其他的兼容】

核心代码：

转换音频时长显示

  /**
   * 工具类
   */
  //转换音频时长显示
  transTime(time) {
    let duration = parseInt(time);
    let minute = parseInt(duration / 60);
    let sec = duration % 60 + '';
    let isM0 = ':';
    if (minute == 0) {
      minute = '00';
    } else if (minute < 10) {
      minute = '0' + minute;
    }
    if (sec.length == 1) {
      sec = '0' + sec;
    }
    return minute + isM0 + sec
  }

获取视频总长

  loadVideo() {
    let self = this;
    let audio = this.refs.audioTag;
    let duration = this.transTime(audio.duration);
    let time = duration == "NaN:NaN" ? "00:00" : duration;
    // alert(audio.duration);

    if (time == "00:00" && duration != "NaN:NaN" && !!initAudio) {
      audio.play();
      audio.pause();
      initAudio = false;

      window.setTimeout(() => {
        self.loadVideo();
      },300);
    }

    this.setState({
      voiceDuration: time,});
  }

更新播放进度

  timeUpdate() {
    let audio = this.refs.audioTag;
    // let value = Math.round((Math.floor(audio.currentTime) / Math.floor(audio.duration)) * 100,0);
    // console.log("timeUpdate " + value);

    let timeline = this.refs.timeline;
    let playhead = this.refs.playhead;
    let timelineWidth = timeline.offsetWidth - playhead.offsetWidth;
    let playPercent = timelineWidth * (audio.currentTime / audio.duration);
    playhead.style.webkitTransform = "translateX(" + playPercent + "px)";
    playhead.style.transform = "translateX(" + playPercent + "px)";

    let timeCurrent = this.transTime(audio.currentTime);
    this.setState({
      timeCurrent: timeCurrent,currentTime: audio.currentTime,});
  }

进度条操作，拖拽和点击都需要调用

/**
   * 进度条操作
   * @param  {[type]} e [description]
   * @return {[type]}   [description]
   */
  timelineClick(e) {
    let timeline = this.refs.timeline;
    let playhead = this.refs.playhead;
    let audio = this.refs.audioTag;
    let timelineWidth = timeline.offsetWidth - playhead.offsetWidth;

    // 更新坐标位置
    // e.pageX 鼠标点击位置
    // offsetLeft  元素 相对于它的直接父元素 的 偏移量
    let newLeft = e.pageX - timeline.offsetParent.offsetLeft;
    let currentTime = audio.duration * (e.pageX - timeline.offsetParent.offsetLeft) / timelineWidth;

    if (newLeft >= 0 && newLeft <= timelineWidth) {
      playhead.style.transform = "translateX(" + newLeft + "px)";
    }
    if (newLeft < 0) {
      playhead.style.transform = "translateX(0)";
      currentTime = 0;
    }
    if (newLeft > timelineWidth) {
      playhead.style.transform = "translateX(" + timelineWidth + "px)";
      currentTime = audio.duration;
    }
    // 更新时间
    let timeCurrent = this.transTime(currentTime);
    this.setState({
      timeCurrent: timeCurrent,currentTime: currentTime,});

    // 如果在播放
    if (this.state.isPlay) {
      audio.currentTime = currentTime;
      audio.play();
    } else { // pause music
      audio.pause();
    }

  }

进度条拖拽相关

  // 进度条点击
  touchStart(e) {
    let events = e.touches[0] || e;
    this.timelineClick(events);
  }

  touchMove(e) {
    // if (this.state.touching !== true) {
    //   return;
    // }
    let events = e.touches[0] || e;
    this.timelineClick(events);
  }

  touchEnd(e) {
    this.setState({
      touching: false,})
  }

HTML代码

          <div className="inline-block voice-container">
            <audio  ref="audioTag" src={this.state.voice} onTimeUpdate={()=>this.timeUpdate()} onLoadedMetadata={()=>this.loadVideo()}/>
            <div className="controls">
              <div className="fake-control">
                <div  className="inline-block fake-control-timeline" >
                  <div ref="timeline" className="timeline inline-block" onClick={(e)=> this.timelineClick(e)} > 
                      <div ref="playhead" className="playhead" onTouchStart={(e)=>this.touchStart(e)} onTouchMove={(e)=>this.touchMove(e)} onTouchEnd={(e)=>this.touchEnd(e)}></div>
                  </div>
                  
                  <div className="inline-block play-time">
                    <div className="inline-block played-time">{this.state.timeCurrent}</div>
                    <div className="inline-block">/</div>
                    <div className="inline-block audio-time" id="audioTime">{this.state.voiceDuration}</div>
                  </div> 
                </div>
                <div className="inline-block voice-control">
                  <a className="play-pause" id="playPause" onClick={()=>this.play()}>
                    <div className="play-icon">{ this.state.isPlay ? stop : play }</div>
                  </a>
                </div>
              </div>
            </div>
            
          </div>

CSS代码就不具体粘贴了~可以看下面的demo调试~

踩的坑：

不能愉快的加载音频的时长

采取兼容方式：

1>第一次没有加载出来时间的时候，自动再调用一次。

2>采用 播放、暂停的方式，获取到 总时长

3>部分机型vivo Xplay5A 等，没有办法在UC上的获取到时长

DEMO 演示地址：

https://codepen.io/CandyQiu/pen/VMOPaw?editors=0110