reader/pages/social/replyDetail/replyDetail.wxml

 <view class="commentArea">
        <view class="{{index === 0? class1 : classNormal}}" wx:for="{{comment}}" wx:key="{{index}}" >
            <image class="avatar" src="{{item.avatar}}" />
            <view class="commentCore">
                <text class="nickName">{{item.name}}</text>
                <text class="time">{{item.time}}</text>
                <text class="gut">{{item.text}}</text>
            </view>
            <view class="btnWrapper">
                <image class="commentBtn" src="../../../static/image/comment.png" wx:if="{{index===0}}" />
                <text class="commentText" wx:if="{{index===0}}">评论</text>
                <image class="likeBtn" src="../../../static/image/like.png" />
                <text class="likeText">{{item.likes}}</text>
            </view>
        </view>
    </view>