<template>
 <div class = 'car_list' reft='scrollobx' @scroll='scrollready($event)'>
 </div>
</template>
<script>
 export default {
  data() {
   return {
    lengthThreshold: 50, //当滑动到距离低端50px时，更新数据
    timeThreshold: 300,
    promise: null
   }
  },
  methods: {
   // 滚动加载列表
   scrollready() {
    if(this.shouldScroll()) {
     if (this.promise) {
      return;
     }
     // 进行加载
     this.fn();
     // 防止多次滑动，频繁请求后台资源
     let self = this;
     this.promise = setTimeout(() => {
      self.promise = null;
     }, this.timeThreshold);
    }
   },
   // 调用父组件请求资源服务
   fn() {
    this.$emit('scrollChange');
   },
   shouldScroll() {
    if(document.scrollTop === 0) {// 滑动距离为0，还没开始滑动
     return false;
    }<br data-filtered="filtered">    // 列表高度 - 列表可视高度 - 滑动的高度 < 50px , 则加载更多
    return this.$refs.scrollbox.scrollHeight - this.$refs.scrollbox.clientHeight - this.$refs.scrollbox.scrollTop < this.lengthThreshold;
   },
  }
 }
</script> 

queryCarApplyShareList() {
  this.Load = true;
  CarResources.methods.queryCarApplyShareList(this.http, this.pageNo, this.pageSize).then((res) => {
   if (res && res.status === 200) {
    if (this.pageNo === 1) { // 加载第一页数据
     this.CarList = res.data || [];
    } else { // 加载更多
     this.CarList = <strong>this.CarList.concat(res.data);</strong>
    }
    this.IsLastPage = res.data.length === 0
   }
   this.Load = false;
  }, () => {
   this.Load = false;
   console.log('接口报错');
  });
},