切换<video> 的src和poster时,如果poster为空,video标签依旧显示封面

无法将poster置空

wxml:

<video id="myVideo" class="video-play" src="{{video.url}}" poster="{{video.poster}}"

          binderror="videoErrorCallback" show-play-btn="true" controls show-center-play-btn="true"></video>

js:

tabCourse(e) {

    this.setData({

      video: {

        url: e.currentTarget.dataset.url,

        poster: e.currentTarget.dataset.poster

      }

    })

  }