<view class="menu_box">
 <text class='menu1 {{menuTapCurrent=="0"?"borders":""}}' data-current="0" catchtap="menuTap">menu1</text>
 <text class='menu2 {{menuTapCurrent=="1"?"borders":""}}' data-current="1" catchtap="menuTap">menu2</text>
</view>
<view class="tab1" hidden="{{menuTapCurrent!='0'}}">tab1</view>
<view class="tab2" hidden="{{menuTapCurrent!='1'}}">tab2</view>

.menu_box{
 display: flex;
 height: 80rpx;
}
.menu1,.menu2{
 flex: 1;
 font-size:30rpx;
 line-height: 80rpx;
 text-align: center;
}
.borders{
 border-bottom: 4rpx solid #f00;
 color: #f00;
}
.tab1,.tab2{
 height: 300rpx;
 background: #23bff3;
}
.tab2{
 background: #ccc;
}

 menuTap:function(e){
 var current=e.currentTarget.dataset.current;//获取到绑定的数据
 //改变menuTapCurrent的值为当前选中的menu所绑定的数据
 this.setData({
  menuTapCurrent:current
 });


 },