<video id="myVideo" src="http://vfx.mtime.cn/Video/2019/03/21/mp4/190321153853126488.mp4" poster="https://res.wx.qq.com/wxdoc/dist/assets/img/0.4cb08bb4.jpg" initial-time='5' controls></video>

浏览器上可以正常播放，小程序上不行