<scroll-view scroll-x="true" class="nav"  scroll-with-animation="{{true}}">

            <block wx:for="{{content.article}}" wx:for-index="idx" wx:for-item="navItem" wx:key="idx" >

            <view class="nav-item {{currentTab == idx ?'active':''}}"  data-current="{{idx}}" bindtap="switchNav">{{navItem.tag_name}}</view>

            </block>        

    </scroll-view>

点击导航触发switchNav函数，但是点击初始页面的导航栏switchNav始终是第一个，点击隐藏后面的导航switchNav才能获取当前点击的导航