微信小程序scroll-view仿拼多多横向滑动滚动条

<scroll-view scroll-x="true" class="scroll-view-x" style="padding-top:10rpx" scroll-with-animation="true" wx:if="{{tlist[currentTab].secondList}}" scroll-left='0' bindscroll="getleft">
  <!--内容区域-->
  <view>
   <view class="navigator_second" wx:for="{{tlist[currentTab].secondList}}" wx:for-item="childItem" bindtap="getProductList" data-id="{{childItem.id}}">
   <image class="navigator_icon" src="{{childItem.icon}}"></image>
   <text class="navigator_text">{{childItem.name}}</text>
   </view>
  </view>
  <view wx:if="{{tlist[currentTab].thirdList}}">
   <view class="navigator_second" wx:for="{{tlist[currentTab].thirdList}}" wx:for-item="childItem" data-id="{{childItem.id}}" bindtap="getProductList">
   <image class="navigator_icon" src="{{childItem.icon}}" ></image>
   <text class="navigator_text">{{childItem.name}}</text>
   </view>
  </view>
  </scroll-view >
  <!--滚动条部分-->
  <view wx:if="{{slideShow}}" class="slide">
  <view class='slide-bar' >
   <view class="slide-show" style="width:{{slideWidth}}rpx; margin-left:{{slideLeft<=1 ? 0 : slideLeft+'rpx'}};"></view>
  </view>
  </view>

//获取应用实例
var app = getApp();
Page({
 data: {
 navigate_type:'',//分类类型，是否包含二级分类
 slideWidth:'',//滑块宽
 slideLeft:0 ,//滑块位置
 totalLength:'',//当前滚动列表总长
 slideShow:false,
 slideRatio:''
 },
 onLoad: function () {
 var self = this ;
 var systemInfo = wx.getSystemInfoSync() ;
 self.setData({
  list: _list,
  windowHeight: app.globalData.navigate_type == 1 ? systemInfo.windowHeight : systemInfo.windowHeight - 35,
  windowWidth: systemInfo.windowWidth,
  navigate_type: app.globalData.navigate_type
 })
 //计算比例
 self.getRatio();
 },
 //根据分类获取比例
 getRatio(){
 var self = this ;
 if (!self.data.tlist[self.data.currentTab].secondList || self.data.tlist[self.data.currentTab].secondList.length<=5){
  this.setData({
  slideShow:false
  })
 }else{
  var _totalLength = self.data.tlist[self.data.currentTab].secondList.length * 150; //分类列表总长度
  var _ratio = 230 / _totalLength * (750 / this.data.windowWidth); //滚动列表长度与滑条长度比例
  var _showLength = 750 / _totalLength * 230; //当前显示红色滑条的长度(保留两位小数)
  this.setData({
  slideWidth: _showLength,
  totalLength: _totalLength,
  slideShow: true,
  slideRatio:_ratio
  })
 }
 } ,
 //slideLeft动态变化
 getleft(e){
 this.setData({
  slideLeft: e.detail.scrollLeft * this.data.slideRatio
 })
 } 
})

.scroll-view-x{
 background-color: #fff;
 white-space: nowrap;
}
.navigator_second{
 width:150rpx;
 text-align:center;
 display:inline-block;
 height:115rpx;
}
.navigator_icon{
 width:60rpx;
 height:60rpx;
}
.navigator_text{
 display:block;
 width:100%;
 font-size:24rpx
}
.slide{
 height:30rpx;
 background:#fff;
 with:100%;
 padding:14rpx 0 5rpx 0
}
.slide .slide-bar{
 width:230rpx;
 margin:0 auto;
 height:1.5px;
 background:#eee;
}
.slide .slide-bar .slide-show{
 height:100%;
 background-color:#ff6969;

}