解决uniapp视频video组件进入全屏再退出全屏后，cover-view失效的问题

给cover-view一个变量如isCloseBtnShow，通过v-if（不要用v-show）来控制显示隐藏。监听video全屏事件，全屏时，设置变量为false,退出全屏时再设为true，这样每次退出全屏,cover-view会重新加载。被覆盖的问题就解决了。

<video class="videoShowStyle" id="myVideo" :src="videoUrl" @fullscreenchange="playerFullScreen"
			@error="videoErrorCallback" @click="closeVideo" controls>
			<cover-image v-if="isCloseBtnShow" class="videoClose" @click="goback"
				src="/static/icon/popupClose.png"></cover-image>
		</video>

data() {
			return {
				isCloseBtnShow: true,
		}
},

playerFullScreen(e) {
	if (e.detail.fullScreen) { //全屏
		this.isCloseBtnShow = false
	} else { //非全屏			
		this.isCloseBtnShow = true
	}
},