WeChat applet development implements tab (TabBar at the top of the window) page switching

<!--index.wxml--> 
<view class="swiper-tab"> 
  <view class="swiper-tab-list {{currentTab==0 ? &#39;on&#39; : &#39;&#39;}}" data-current="0" bindtap="swichNav">哈哈</view> 
  <view class="swiper-tab-list {{currentTab==1 ? &#39;on&#39; : &#39;&#39;}}" data-current="1" bindtap="swichNav">呵呵</view> 
  <view class="swiper-tab-list {{currentTab==2 ? &#39;on&#39; : &#39;&#39;}}" data-current="2" bindtap="swichNav">嘿嘿</view> 
</view> 
 
<swiper current="{{currentTab}}" class="swiper-box" duration="300" style="height:{{winHeight - 31}}px" bindchange="bindChange"> 
  <!-- 我是哈哈 --> 
  <swiper-item> 
   <view>我是哈哈</view> 
  </swiper-item> 
  <!-- 我是呵呵 --> 
  <swiper-item> 
   <view>我是呵呵</view> 
  </swiper-item> 
  <!-- 我是嘿嘿 --> 
  <swiper-item> 
   <view>我是嘿嘿</view> 
  </swiper-item> 
</swiper>

/**indexwxss**/ 
swiper-tab{ 
  width: 100%; 
  border-bottom: 2rpx solid #777777; 
  text-align: center; 
  line-height: 80rpx;} 
swiper-tab-list{ font-size: 30rpx; 
  display: inline-block; 
  width: 33%; 
  color: #777777; 
} 
on{ color: #da7c0c; 
  border-bottom: 5rpx solid #da7c0c;} 
 
swiper-box{ display: block; height: 100%; width: 100%; overflow: hidden; } 
swiper-box view{ 
  text-align: center; 
}

//index.js 
//获取应用实例 
var app = getApp() 
Page( { 
 data: { 
  /** 
    * 页面配置 
    */ 
  winWidth: 0, 
  winHeight: 0, 
  // tab切换 
  currentTab: 0, 
 }, 
 onLoad: function() { 
  var that = this; 
 
  /** 
   * 获取系统信息 
   */ 
  wxgetSystemInfo( { 
 
   success: function( res ) { 
    thatsetData( { 
     winWidth: reswindowWidth, 
     winHeight: reswindowHeight 
    }); 
   } 
 
  }); 
 }, 
 /** 
   * 滑动切换tab 
   */ 
 bindChange: function( e ) { 
 
  var that = this; 
  thatsetData( { currentTab: edetailcurrent }); 
 
 }, 
 /** 
  * 点击tab切换 
  */ 
 swichNav: function( e ) { 
 
  var that = this; 
 
  if( thisdatacurrentTab === etargetdatasetcurrent ) { 
   return false; 
  } else { 
   thatsetData( { 
    currentTab: etargetdatasetcurrent 
   }) 
  } 
 } 
})