<view class="section tc">
 <video src="{{src}}"  controls ></video>
 <view class="btn-area">
  <button bindtap="bindButtonTap">獲取視頻</button>
 </view>
</view>

<!-- 
 danmu-list:彈幕列表
 enable-danmu:是否顯示彈幕
 danmu-btn:彈幕按鈕
 controls:是否顯示視頻控件，并沒有什么用
 -->
<view class="section tc">
 <video id="myVideo" src="http://wxsnsdy.tc.qq.com/105/20210/snsdyvideodownload?filekey=30280201010421301f0201690402534804102ca905ce620b1241b726bc41dcff44e00204012882540400&bizid=1023&hy=SH&fileparam=302c020101042530230204136ffd93020457e3c4ff02024ef202031e8d7f02030f42400204045a320a0201000400" binderror="videoErrorCallback" danmu-list="{{danmuList}}" enable-danmu danmu-btn controls></video>
 <view class="btn-area">
  <button bindtap="bindButtonTap">獲取視頻</button>
  <input bindblur="bindInputBlur"/>
  <button bindtap="bindSendDanmu">發(fā)送彈幕</button>
 </view>
</view>

<!-- 現(xiàn)在的video就下面三個屬性 -->
<video src="" binderror="" hidden></video>

.js

function getRandomColor () {
 let rgb = []
 for (let i = 0 ; i < 3; ++i){
  let color = Math.floor(Math.random() * 256).toString(16)
  color = color.length == 1 ? '0' + color : color
  rgb.push(color)
 }
 return '#' + rgb.join('')
}

Page({
 onReady: function (res) {
  this.videoContext = wx.createVideoContext('myVideo')
 },
 inputValue: '',
  data: {
    src: '',
  danmuList: [
   {
    text: '第 1s 出現(xiàn)的彈幕',
    color: '#ff0000',
    time: 1
   },
   {
    text: '第 3s 出現(xiàn)的彈幕',
    color: '#ff00ff',
    time: 3
   }
  ]
  },
 bindInputBlur: function(e) {
  this.inputValue = e.detail.value
 },
  bindButtonTap: function() { //視頻下載
    var that = this
    wx.chooseVideo({
      sourceType: ['album', 'camera'],
      maxDuration: 60,
      camera: ['front','back'],
      success: function(res) {
        that.setData({
          src: res.tempFilePath
        })
      }
    })
  },
 bindSendDanmu: function () {
  this.videoContext.sendDanmu({
   text: this.inputValue,
   color: getRandomColor()
  })
 },
  videoErrorCallback: function(e) {
   console.log('視頻錯誤信息:');
   console.log(e.detail.errMsg);
  }
})

效果