微信小程序中顶部导航栏的实现代码

<view class="swiper-tab">  
  <view class="swiper-tab-list {{currenttab==0 ? 'on' : ''}}" data-current="0" bindtap="swichnav">11</view>  
  <view class="swiper-tab-list {{currenttab==1 ? 'on' : ''}}" data-current="1" bindtap="swichnav">22</view>  
  <view class="swiper-tab-list {{currenttab==2 ? 'on' : ''}}" data-current="2" bindtap="swichnav">33</view> 
  <view class="swiper-tab-list {{currenttab==3 ? 'on' : ''}}" data-current="3" bindtap="swichnav">44</view> 
  <view class="swiper-tab-list {{currenttab==4 ? 'on' : ''}}" data-current="4" bindtap="swichnav">55</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-item>  
   <view>我是嘿嘿</view>  
  </swiper-item>  
  <swiper-item>  
   <view>我是嘿嘿</view>  
  </swiper-item>  
</swiper>  

.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: 20%;  
  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;  
}  

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 
   */  
  wx.getsysteminfo( {  
  
   success: function( res ) {  
    that.setdata( {  
     winwidth: res.windowwidth,  
     winheight: res.windowheight  
    });  
   }  
  
  });  
 },  
 /** 
   * 滑动切换tab 
   */  
 bindchange: function( e ) {  
  
  var that = this;  
  that.setdata( { currenttab: e.detail.current });  
  
 },  
 /** 
  * 点击tab切换 
  */  
 swichnav: function( e ) {  
  
  var that = this;  
  
  if( this.data.currenttab === e.target.dataset.current ) {  
   return false;  
  } else {  
   that.setdata( {  
    currenttab: e.target.dataset.current  
   })  
  }   
 }, 
 /** 
 * 点击分享 
 */ 
 onshareappmessage: function () { 
  return { 
   title: '装逼小程序', 
   path: '/page/user?id=123' 
  } 
 } 
})