update docs/component/cover-view.md.

修改示例

docs/component/cover-view.md

@@ -90,7 +90,7 @@ app-vue上可覆盖的原生组件：`<video>`、`<map>`
 <!-- 本示例未包含完整css，获取外链css请参考上文，在hello uni-app项目中查看 -->
 <template>
 	<view class="page">
-		<video class="video" id="demoVideo" :controls="false" :enable-progress-gesture="false" :show-center-play-btn="disable" src="https://img.cdn.aliyun.dcloud.net.cn/guide/uniapp/%E7%AC%AC1%E8%AE%B2%EF%BC%88uni-app%E4%BA%A7%E5%93%81%E4%BB%8B%E7%BB%8D%EF%BC%89-%20DCloud%E5%AE%98%E6%96%B9%E8%A7%86%E9%A2%91%E6%95%99%E7%A8%8B@20181126-lite.m4v">
+		<video class="video" id="demoVideo" :controls="false" :enable-progress-gesture="false" :show-center-play-btn="true" src="https://img.cdn.aliyun.dcloud.net.cn/guide/uniapp/%E7%AC%AC1%E8%AE%B2%EF%BC%88uni-app%E4%BA%A7%E5%93%81%E4%BB%8B%E7%BB%8D%EF%BC%89-%20DCloud%E5%AE%98%E6%96%B9%E8%A7%86%E9%A2%91%E6%95%99%E7%A8%8B@20181126-lite.m4v">
 			<cover-view class="controls-title">简单的自定义 controls</cover-view>
 			<cover-image class="controls-play img" @click="play" src="/static/play.png"></cover-image>
 			<cover-image class="controls-pause img" @click="pause" src="/static/pause.png"></cover-image>