转载【微信小程序】：微信小程序滚动Tab选项卡：左右可滑动切换(仿某宝)

1、本文转载至：http://blog.csdn.net/sophie_u/article/details/71745125

2、效果：

3、最终效果如上。问题： 
1）、tab标题总共8个，所以一屏无法全部显示。 
2）、tab内容区左右滑动切换时，tab标题随即做标记（active）。 
3）、当active的标题不在当前屏显示时，要使其能显示到当前屏中。

4、

一、wxml结构

tab标题因一排八个，所以使用 scroll-view组件，使其可横向滚动。 
tab内容可左右滑动切换，使用swiper组件实现 
为了偷懒，所以数据都通过wx:for遍历重复出来。

说明：

1、设置data-current属性用于：点击当前项时，通过点击事件swichNav中处理e.dataset.current取到点击的目标值。 
2、swiper组件的current组件用于控制当前显示哪一页 
3、swiper组件绑定change事件switchTab，通过e.detail.current拿到当前页

<view >
    <scroll-view scroll-x="true" class="tab-h" scroll-left="{{scrollLeft}}">
        <view class="tab-item {{currentTab==0?'active':''}}"  data-current="0" bindtap="swichNav">健康</view>
        <view class="tab-item {{currentTab==1?'active':''}}" data-current="1" bindtap="swichNav">情感</view>
        <view class="tab-item {{currentTab==2?'active':''}}" data-current="2" bindtap="swichNav">职场</view>
        <view class="tab-item {{currentTab==3?'active':''}}" data-current="3" bindtap="swichNav">育儿</view>
        <view class="tab-item {{currentTab==4?'active':''}}" data-current="4" bindtap="swichNav">纠纷</view>
        <view class="tab-item {{currentTab==5?'active':''}}" data-current="5" bindtap="swichNav">青葱</view>
        <view class="tab-item {{currentTab==6?'active':''}}" data-current="6" bindtap="swichNav">全部</view>
        <view class="tab-item {{currentTab==7?'active':''}}" data-current="7" bindtap="swichNav">其他</view>
    </scroll-view>
    <swiper class="tab-content" current="{{currentTab}}" duration="300" bindchange="switchTab"
     style="height:{{winHeight}}rpx">
        <swiper-item wx:for="{{[0,1,2,3,4,5,6,7]}}">
            <scroll-view scroll-y="true" class="scoll-h" >
                <block wx:for="{{[1,2,3,4,5,6,7,8]}}" wx:key="*this">
                    <view class="item-ans">
                        <view class="avatar">
                            <image class="img" src="http://ookzqad11.bkt.clouddn.com/avatar.png"></image>
                        </view>
                        <view class="expertInfo">
                            <view class="name">欢颜</view>
                            <view class="tag">知名情感博主</view>
                            <view class="answerHistory">134个回答，2234人听过 </view>
                        </view>
                        <navigator url="/pages/askExpert/expertDetail" class="askBtn">问TA</navigator> 
                    </view>
                </block>
            </scroll-view>
        </swiper-item>
    </swiper>
</view>

三、js部分

var app = getApp();
Page({
    data:{
        winHeight:"",//窗口高度
        currentTab:0, //预设当前项的值
        scrollLeft:0, //tab标题的滚动条位置
        expertList:[{ //假数据
            img:"avatar.png",
            name:"欢顔",
            tag:"知名情感博主",
            answer:134,
            listen:2234
        }]
    },
    // 滚动切换标签样式
    switchTab:function(e){
        var that = this;
        that.setData({
            currentTab:e.detail.current
        });
        that.checkCor();
    },
    // 点击标题切换当前页时改变样式
    swichNav:function(e){
　　　　　var that = this;　
        var cur=e.target.dataset.current;
        if(that.data.currentTaB==cur){return false;}
        else{
            that.setData({
                currentTab:cur
            })
        }
    },
    //判断当前滚动超过一屏时，设置tab标题滚动条。
    checkCor:function(){
　　　 var that = this;
      if (that.data.currentTab>4){
        that.setData({
          scrollLeft:300
        })
      }else{
        that.setData({
          scrollLeft:0
        })
      }
    },
    onLoad: function() {  
        var that = this; 
        //  高度自适应
        wx.getSystemInfo( {  
            success: function( res ) {  
                var clientHeight=res.windowHeight,
                    clientWidth=res.windowWidth,
                    rpxR=750/clientWidth;
              var  calc=clientHeight*rpxR-180;
                console.log(calc)
                that.setData( {  
                    winHeight: calc  
                });  
            }  
        });
    },  
    footerTap:app.footerTap
})

三、wxss样式

.tab-h{
    height: 80rpx;width: 100%; box-sizing: border-box;overflow: hidden;line-height: 80rpx;background: #F7F7F7; font-size: 16px; white-space: nowrap;position: fixed;top: 0; left: 0; z-index: 99;}
.tab-item{margin:0 36rpx;display: inline-block;}
.tab-item.active{color: #4675F9;position: relative;}
.tab-item.active:after{ content: "";display: block;height: 8rpx;width: 52rpx;background: #4675F9;position: absolute; bottom: 0;left: 5rpx;border-radius: 16rpx;}
.item-ans{ width: 100%;display: flex; flex-grow: row no-wrap;justify-content: space-between; padding: 30rpx;box-sizing: border-box; height: 180rpx;align-items: center;border-bottom: 1px solid #F2F2F2;}
.avatar{width: 100rpx;height: 100rpx;position: relative;padding-right: 30rpx;}
.avatar .img{width: 100%;height: 100%;}
.avatar .doyen{width: 40rpx;height: 40rpx;position: absolute;bottom: -2px;right: 20rpx;}
.expertInfo{font-size: 12px;flex-grow: 2;color: #B0B0B0;line-height: 1.5em;}
.expertInfo .name{font-size: 16px;color:#000;margin-bottom: 6px;}
.askBtn{ width: 120rpx;height: 60rpx;line-height: 60rpx;text-align: center;font-size: 14px; border-radius: 60rpx;border: 1px solid #4675F9; color:#4675F9;}
.tab-content{margin-top: 80rpx;}
.scoll-h{height: 100%;}