wx.createVideoContext(videoId)

建设并返回 video 上下文videoContext工具

videoContext

videoContext通过 videoId 跟一个 video 组件绑定，，，，通过它可以操作一个 video 组件
。。

videoContext工具的要领列表：

示例代码：

<view class="section tc">  <video id="myVideo" src="http://wxsnsdy.tc.qq.com/105/20210/snsdyvideodownload?filekey=30280201010421301f0201690402534804102ca905ce620b1241b726bc41dcff44e00204012882540400&bizid=1023&hy=SH&fileparam=302c020101042530230204136ffd93020457e3c4ff02024ef202031e8d7f02030f42400204045a320a0201000400"   enable-danmu danmu-btn controls></video>
  <view class="btn-area">
    <input bindblur="bindInputBlur"/>
    <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)
    color = color.length == 1 ? '0' + color : color
    rgb.push(color)
  }
  return '#' + rgb.join('')
}

Page({
  onReady: function (res) {
    this.videoContext = wx.createVideoContext('myVideo')
  },
  inputValue: '',
  bindInputBlur: function(e) {
    this.inputValue = e.detail.value
  },
  bindSendDanmu: function () {
    this.videoContext.sendDanmu({
      text: this.inputValue,
      color: getRandomColor()
    })
  }
})