自定义组件里怎么操作video组件？

如下不行：

Component.js

Component({

    properties: {},

    data:{},

    methods:{

        play(){

            var videoContext=wx.createVideoContext('video', this);

            videoContext.play()

        }

    }

})

Component.wxml

<video id="video" src="

http://wxsnsdy.tc.qq.com/105/20210/snsdyvideodownload?filekey=30280201010421301f0201690402534804102ca905ce620b1241b726bc41dcff44e00204012882540400&bizid=1023&hy=SH&fileparam=302c020101042530230204136ffd93020457e3c4ff02024ef202031e8d7f02030f42400204045a320a0201000400

"></video>

<button bindtap="play">播放</button>