Page({

 data: {
  arr: [1,2,3,4,5,6,7,8],
  index: 1
 },

 onLoad: function (options) {
  this.setData({
   childW: this.data.arr.length * 80
  });
 },

 tabOn: function (e) {
  this.setData({
   index: e.currentTarget.dataset.index + 1
  });
 }

})

<scroll-view scroll-x scroll-with-animation='true'>
 <view style='width: {{ childW }}px'>
  <block wx:for='{{ arr }}'>
   <view class='tab' catchtap='tabOn' data-index='{{ index }}'>{{ item }}</view>
  </block>
 </view>
</scroll-view>

<view class='content' wx:if='{{ index == 1 }}'>内容一</view>
<view class='content' wx:if='{{ index == 2 }}'>内容二</view>
<view class='content' wx:if='{{ index == 3 }}'>内容三</view>
<view class='content' wx:if='{{ index == 4 }}'>内容四</view>
<view class='content' wx:if='{{ index == 5 }}'>内容五</view>
<view class='content' wx:if='{{ index == 6 }}'>内容六</view>
<view class='content' wx:if='{{ index == 7 }}'>内容七</view>
<view class='content' wx:if='{{ index == 8 }}'>内容八</view>

.tab{
 height: 50px;
 width: 80px;
 display: inline-block;
 text-align: center;
 line-height: 50px;
}

.tab:nth-child(odd){
 background-color: #ccc;
}

.content{
 width: 100%;
 height: 200px;
 text-align: center;
 line-height: 200px;
}