<template>
 <div class = 'car_list' reft='scrollobx' @scroll='scrollready($event)'>
 </div>
</template>
<script>
 export default {
  data() {
   return {
    lengthThreshold: 50, //當(dāng)滑動(dòng)到距離低端50px時(shí)，更新數(shù)據(jù)
    timeThreshold: 300,
    promise: null
   }
  },
  methods: {
   // 滾動(dòng)加載列表
   scrollready() {
    if(this.shouldScroll()) {
     if (this.promise) {
      return;
     }
     // 進(jìn)行加載
     this.fn();
     // 防止多次滑動(dòng)，頻繁請(qǐng)求后臺(tái)資源
     let self = this;
     this.promise = setTimeout(() => {
      self.promise = null;
     }, this.timeThreshold);
    }
   },
   // 調(diào)用父組件請(qǐng)求資源服務(wù)
   fn() {
    this.$emit('scrollChange');
   },
   shouldScroll() {
    if(document.scrollTop === 0) {// 滑動(dòng)距離為0，還沒(méi)開(kāi)始滑動(dòng)
     return false;
    }<br data-filtered="filtered">    // 列表高度 - 列表可視高度 - 滑動(dòng)的高度 < 50px , 則加載更多
    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) { // 加載第一頁(yè)數(shù)據(jù)
     this.CarList = res.data || [];
    } else { // 加載更多
     this.CarList = <strong>this.CarList.concat(res.data);</strong>
    }
    this.IsLastPage = res.data.length === 0
   }
   this.Load = false;
  }, () => {
   this.Load = false;
   console.log('接口報(bào)錯(cuò)');
  });
},