for循环渲染时点击加样式（单个）

 <block wx:for="{{commentContent}}" wx:for-index="comNum" wx:for-item="comItem">

                <view class="commentContent">
                        <image class="commentHead" src="{{comItem.imgHead}}" mode='aspectFit' lazy-load="false" />
                        <text class="commentTel">{{comItem.tel}}</text>
                        <view class="contentText">{{comItem.content}}</view>
                        <image wx:if="{{comItem.images}}" class="commentPhoto" src="{{comItem.images}}" mode='aspectFit'></image>
                        <view class="commentBotten" hover-class="none" hover-stop-propagation="false">
                                <view class="commentDate" hover-class="none" hover-stop-propagation="false">
                                        {{comItem.date}}
                                </view>
                                <block wx:if="{{comindex==comNum}}">
                                        <view bindtap='zanClick' data-index="{{comItem}}" class="commentZan yizan"
                                                hover-class="none" hover-stop-propagation="false">
                                                <image class="" src="../../images/yizan.png" mode="aspectFit" lazy-load="false"
                                                        binderror="" bindload="" />
                                                <text class="">{{comItem.zanNum}}</text>
                                        </view>
                                </block>
                                <block wx:else>
                                        <view bindtap='zanClick' data-index="{{comNum}}" class="commentZan zan"
                                                hover-class="none" hover-stop-propagation="false">
                                                <image class="" src="../../images/zan.png" mode="aspectFit" lazy-load="false"
                                                        binderror="" bindload="" />
                                                <text class="">{{comItem.zanNum}}</text>
                                        </view>
                                </block>




                        </view>
                </view>
        </block>