微信小程序實現tab切換效果

<view class="body">
 <view class="nav bc_white">
 <view class="{{selected?'red':'default'}}" bindtap="selected">系統提醒</view>
 <view class="{{selected1?'red':'default'}}" bindtap="selected1">優惠活動</view>
 </view>
 <view class="{{selected?'show':'hidden'}}">for system</view>
 <view class="{{selected1?'show':'hidden'}}">for activity</view>
</view>

page{background-color:#edf0f3;}
.nav{width:100%;height:100rpx;display:flex;flex-direction:row;}
.default{line-height:100rpx;text-align:center;flex:1;border-right:1px solid gainsboro;color:#000;font-weight:bold;font-size:28rpx;}
.red{line-height:100rpx;text-align:center;color:#fc5558;flex:1;border-right:1px solid gainsboro;font-weight:bold;font-size:28rpx;}
.show{display:block;text-align:center;line-height:200rpx;}
.hidden{display:none;text-align:center;line-height:200px;}

Page({
 data:{
 selected:true,
 selected1:false
 },
 selected:function(e){
 this.setData({
 selected1:false,
 selected:true
 })
 },
 selected1:function(e){
 this.setData({
 selected:false,
 selected1:true
 })
 }
})