微信小程序（9）--音频及视频弹幕

记录微信小程序音频及视频弹幕播放效果。

1.audio

<!-- audio.wxml -->
<audio poster="{{poster}}" name="{{name}}" author="{{author}}" src="{{src}}" id="myAudio" controls loop></audio>

<button type="primary" bindtap="audioPlay">播放</button>
<button type="primary" bindtap="audioPause">暂停</button>
<button type="primary" bindtap="audio14">设置当前播放时间为14秒</button>
<button type="primary" bindtap="audioStart">回到开头</button>

// audio.js
Page({
  onReady: function (e) {
    // 使用 wx.createAudioContext 获取 audio 上下文 context
    this.audioCtx = wx.createAudioContext('myAudio')
  },
  data: {
    poster: 'http://y.gtimg.cn/music/photo_new/T002R300x300M000003rsKF44GyaSk.jpg?max_age=2592000',
    name: '此时此刻',
    author: '许巍',
    src: 'http://ws.stream.qqmusic.qq.com/M500001VfvsJ21xFqb.mp3?guid=ffffffff82def4af4b12b3cd9337d5e7&uin=346897220&vkey=6292F51E1E384E06DCBDC9AB7C49FD713D632D313AC4858BACB8DDD29067D3C601481D36E62053BF8DFEAF74C0A5CCFADD6471160CAF3E6A&fromtag=46',
  },
//播放
  audioPlay: function () {
    this.audioCtx.play()
  },
//暂停
  audioPause: function () {
    this.audioCtx.pause()
  },
//设置当前播放时间在14秒
  audio14: function () {
    this.audioCtx.seek(14)
  },
//回到开头
  audioStart: function () {
    this.audioCtx.seek(0)
  }
})

2.video

 默认宽度300px、高度225px

<view class="section tc">
  <video id="myVideo" src="http://wxsnsdy.tc.qq.com/105/20210/snsdyvideodownload?filekey=30280201010421301f0201690402534804102ca905ce620b1241b726bc41dcff44e00204012882540400&bizid=1023&hy=SH&fileparam=302c020101042530230204136ffd93020457e3c4ff02024ef202031e8d7f02030f42400204045a320a0201000400" danmu-list="{{danmuList}}" enable-danmu danmu-btn controls></video>
  <view class="btn-area">
    <input bindblur="bindInputBlur" placeholder="输入文字"/>
    <button bindtap="bindSendDanmu">发送弹幕</button>
  </view>
</view>

function getRandomColor () {
  let rgb = []
  for (let i = 0 ; i < 3; ++i){
    let color = Math.floor(Math.random() * 256).toString(16)
// 0.0 ~ 1.0 之间的一个伪随机数。Math.random()。floor() 方法执行的是向下取整计算，它返回的是小于或等于函数参数，并且与之最接近的整数。toString() 方法可把一个逻辑值转换为字符串，并返回结果。
    color = color.length == 1 ? '0' + color : color
    rgb.push(color)
  }
// join() 方法用于把数组中的所有元素放入一个字符串。
  return '#' + rgb.join('')
}

Page({
  onReady: function (res) {
    this.videoContext = wx.createVideoContext('myVideo')
  },
  inputValue: '',
    data: {
        src: '',
    danmuList: [
      {
        text: '第 1s 出现的弹幕',
        color: '#ff0000',
        time: 1
      },
      {
        text: '第 3s 出现的弹幕',
        color: '#ff00ff',
        time: 3
    }]
    },
  bindInputBlur: function(e) {
    this.inputValue = e.detail.value
  },
//发送弹幕文字
  bindSendDanmu: function () {
    this.videoContext.sendDanmu({
      text: this.inputValue,
      color: getRandomColor()
    })
  }
})