vue better scroll 无法滚动的解决方法

<!-- 订单列表 -->
<div id="order-list" ref="scrollWrap">
 <ul v-if="orderLists.length > 0">
  <li v-for="(orderList,index) in orderLists" :key="index">
   <div class="order-info"> 订单信息 </div>
   </li>
 </ul>
 <div class="no-orders" v-else>
  <p>最近没有订单</p>
 </div>
</div>

// init better scroll
initScroll() {
 let self = this;
 if (!this.scroll) {
  this.scroll = new BScroll(self.$refs.scrollWrap, {
   bounceTime: 200,
   click: true,
   mouseWheel: true,
   scrollbar: { // 滚动条
    fade: true,
   },
  pullUpLoad: { // 上拉加载
   threshold: -40,
  }
  })
 } else {
 this.scroll.refresh();
 }
 this.scroll.on('pullingUp', () => {
 if(this.orderLists.length%10 == 0) { 
  // 判断是否还有订单，但没有考虑用户有10的整倍数条订单的情况
  this.orderSize += 10;
  this.resentOrders();
  return;
 } else {
  Toast("没有更多了")
 }
 })
},

<!-- 订单列表 -->
<div id="order-list" ref="scrollWrap">
 <ul v-show="orderLists.length > 0">
  <li v-for="(orderList,index) in orderLists" :key="index">
   <div class="order-info"> 订单信息 </div>
  </li>
 </ul>
 <div class="no-orders" v-show="orderLists.length === 0" >
  <p>最近没有订单</p>
 </div>
</div>