真机测试上面，cover-view依旧被video遮挡，层级没有video高，下面贴上代码片段

<view class='content'>

<view class='line'></view>

<view class='mainCon'>

<view class='search'>

<image src='http://qiniu.xnsystem.com/VpaySearch.png' catchtap='doSearch'></image>

<view>

<input placeholder='请输入想要搜索的内容' value='{{search}}'  bindinput='getInput' bindconfirm='doSearch'></input>

</view>

</view>

<view wx:for='{{content}}' wx:key='content' class='card' data-index='{{item.id}}' catchtap='doSelect'>

<view class='cardLeft'>

<checkbox-group data-index='{{item.id}}' bindchange='doSelect'>

<label>

<checkbox checked='{{checked==item.id}}'></checkbox>

<image src='{{item.image}}'></image>

</label>

</checkbox-group>

</view>

<view class='cardRight'>

<view class='cardName'>{{item.nick_name}}</view>

<view class='cardCon'>{{item.text_content}}</view>

<view class='cardImg'>

<image wx:if='{{item.media_type==1}}' wx:for='{{item.media_content}}' wx:key='{{index}}' wx:for-item='img' src='{{img}}' mode='aspectFill'></image>

<video wx:if='{{item.media_type==2}}' src='{{item.media_content}}'></video>

</view>

<view class='cardAddress'>{{item.address}}</view>

<view class='cardBot'>

<view class='cardTime'>{{item.time}}</view>

<view class='cardScan'>

<image src='/assets/images/index/scan.png'></image>

<view>{{item.look_num}}</view>

</view>

</view>

</view>

</view>

</view>

</view>

<cover-view class='button' catchtap='doSubmit'>确定</cover-view>