vue实现滑动到底部加载更多效果

<template>
 <div class="content">
 <div class="logo">
  <div>
  <img v-if="server[0].thUintroduceLogo" :src="setIp + server[0].thUintroduceLogo" alt="">
  <img v-if="!server[0].thUintroduceLogo" src="../../../assets/images/shooping/u538.png" alt="">
  </div>
  <div>
  <span>{{server[0].companyName}}</span>
  </div>
  <div @click="callCustomer()">
  <img src="../../../assets/images/shooping/u37.png" alt=""> 致电客服
  </div>
 </div>
 <div class="info">
  <div class="swipe">
  <mt-swipe ref="swipe" :auto="0" :showIndicators="false" @change="swipeChange">
   <mt-swipe-item v-for="(item,index) in server[0].thUintroduceImg.split(',')" :key="index">
   <div class="jcc">
    <img :src="setIp + item" alt="">
   </div>
   </mt-swipe-item>
  </mt-swipe>
  <span class="index">{{activeIndex}}/{{server[0].thUintroduceImg.split(',').length}}</span>
  </div>
  <div class="info1">
  <p>{{server[0].thUintroduceText}}</p>
  <span @click="hidden()" v-if="show"> <i>......</i> 展开</span>
  </div>
 </div>
 <div class="shopping">
  <h4>
  <img src="../../../assets/images/shooping/u19.png" alt="">
  <span>全部商品</span>
  </h4>
  <img src="../../../assets/images/shooping/split.jpg" alt="">
 </div>
 <div>
  <div ref="my_pull" class="listUl">
  <div v-for="item in server" :key="item.pId" class="itemLIST" @click="pushInfo(item)">
   <div>
   <img :src="setIp + item.pImgeOne" alt="">
   </div>
   <div>
   <h3>{{item.pTitle}}</h3>
   <p>
    <span>已售{{item.pSaleNums}}件</span>
    <span v-if="!isMemberId">价格登录可见</span>
    <span v-if="isMemberId">¥{{item.uPrice}}</span>
   </p>
   </div>
  </div>
  <!-- <div v-for="item in 10" :key="item" style="height:100px">{{item}}</div> -->
  </div>
 </div>
 <div v-if="isbottom == -1" class="isbottom">
  <i class="iconfont icon-jiazai1"></i>
  <span>加载中，请稍后</span>
 </div>
 <div v-if="isbottom == 1" class="isbottom">
  <span>没有更多数据了</span>
 </div>
 </div>
</template>

<script>
 import {
 Swipe,
 SwipeItem,
 Popup
 } from 'mint-ui'
 export default {
 data: () => ({
  server: [],
  page: 1,
  clientHeight: 0,
  el: {},
  isbottom: 0,
  show: true,
  activeIndex: 1
 }),
 created() {
  this.getServer()
 },
 beforeDestroy() {
  let title = document.querySelector("#title")
  title.style.background = "#6a7d8f";
  let arr = document.querySelector(".is-left")
  arr.style.color = "#fff"
 },
 computed: {
  isMemberId() {
  return this.$store.state.isMemberId
  }
 },
 mounted() {
  this.clientHeight = document.documentElement.clientHeight
  this.$nextTick(() => {
  let title = document.querySelector("#title")
  title.style.background = "#fff";
  let arr = document.querySelector(".is-left")
  arr.style.color = "#333"
  this.el = this.$refs.my_pull;
  window.addEventListener('scroll', this.handleScroll)
  })
 },
 methods: {
  callCustomer() {
  let msg = this.server[0].thServicePhone;
  $App.callCustomer(msg);
  },
  swipeChange() {
  this.activeIndex = this.$refs.swipe.index + 1
  },
  hidden() {
  let el = document.querySelector(".info1")
  el.style.height = "auto"
  this.show = false
  },
  pushInfo(item) {
  this.$store.dispatch("newshoppingInfo", item)
  console.log(this.$store.state.shoppingInfo);
  this.$router.push({
   path: "/shooping/shoopingInfo",
  })
  },
  handleScroll() {
  let a = this.el.getBoundingClientRect().bottom;
  a = Math.ceil(a);
  if (a == this.clientHeight) {
   this.isbottom = -1
   this.page++
   this.getServer()
  }
  },
  // 获取后台数据
  getServer() {
  $App.showWebActivity();
  this.$http.post(this.root + 'agriculture/xxxxxxxxx', {
   key: this.zkey,
   code: this.zcode,
   page: this.page,
   rows: 4,
   townsid: sessionStorage.getItem("villageId"),
   pUid: sessionStorage.getItem("shoppingUid")
  }, {
   emulateJSON: true
  }).then((res) => {
   $App.dismissWebActivity()
   if (res.body.code == 100) {
   if (this.page == 1) {
    this.server = res.body.list.rows;
   } else {
    this.server = this.server.concat(res.body.list.rows)
   }
   if (res.body.list.rows.length >= 4) {
    this.isLast = false
   } else {
    this.isLast = true;
    this.isbottom = 1
    window.removeEventListener('scroll', this.handleScroll)
   }
   } else {
   $App.toastWebActivity(res.body.message)
   console.log(res)
   }
  }, (err) => {
   $App.dismissWebActivity()
  })
  },
 },
 }
</script>

<style lang="less" scoped>
 .content {
 .isbottom {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 15px 0;
  color: #999;
  i {
  font-size: 30px;
  animation: rotate 1s infinite;
  }
  span {
  color: #ccc;
  padding-left: 15px;
  }
 }
 .logo {
  background: #fff;
  padding-bottom: 15px;
  div {
  &:nth-child(1) {
   display: flex;
   justify-content: center;
   img {
   width: 60px;
   height: 60px;
   }
  }
  &:nth-child(2) {
   text-align: center;
   padding: 15px 15px;
   color: #609bf0;
  }
  &:nth-child(3) {
   display: flex;
   justify-content: center;
   align-items: center;
   color: #1296db;
   border: #1296db 1PX solid;
   width: 50%;
   margin: 0 auto;
   padding: 5px 0;
   font-size: 15px;
   img {
   width: 20px;
   height: 20px;
   margin-right: 8px;
   }
  }
  }
 }
 .info {
  background: #fff;
  margin-bottom: 10px;
  padding-bottom: 15px;
  .swipe {
  height: 300px;
  background: #eee;
  position: relative;
  .jcc {
   display: flex;
   justify-content: center;
   height: 300px;
  }
  img {
   // width: 100%;
   height: 100%;
  }
  .index {
   position: absolute;
   background: rgba(243, 244, 245, .8);
   padding: 5px 15px;
   bottom: 10px;
   right: 10px;
   border-radius: 50px;
  }
  }
 }
 .info1 {
  background: #fff;
  position: relative;
  padding: 15px 9px 0;
  height: 79px;
  overflow: hidden;
  p {
  line-height: 22px;
  text-indent: 2em;
  letter-spacing: 1.2px;
  }
  span {
  width: 75px;
  text-align: right;
  position: absolute;
  bottom: 0;
  right: 9px;
  color: #39c;
  background: #fff;
  i {
   color: #333;
  }
  }
 }
 .shopping {
  background: #fff;
  padding-top: 15px;
  h4 {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: 10px;
  >img {
   width: 30px;
   height: 30px;
   margin-right: 10px;
  }
  span {
   color: #0f589e;
   font-weight: normal;
  }
  }
  img {
  display: block;
  width: 100%;
  height: 2px;
  }
 }
 .listUl {
  // display: flex;
  // flex-wrap: wrap;
  padding: 0 15px;
  top: 60px;
  height: calc(100% - 100px) !important;
  background: #fff;
  overflow: hidden;
  .itemLIST {
  // float: left;
  width: 50%;
  display: inline-block;
  padding-top: 15px;
  padding-bottom: 15px;
  &:nth-child(2n) {
   padding-right: 5px;
  }
  &:nth-child(2n -1) {
   padding-left: 5px;
  }
  img {
   // width: 100%;
   height: 100%;
   /* prettier-ignore */
   // border: 1PX solid #eee;
  }
  div {
   &:first-child {
   overflow: hidden;
   height: 160px;
   display: flex;
   align-items: center;
   justify-content: center;
   }
   &:last-child {
   h3 {
    font-weight: normal;
    font-size: 16px;
    margin-top: 5px;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
   }
   p {
    font-size: 14px;
    margin-top: 5px;
    display: flex;
    align-items: center;
    justify-content: space-between; // padding: 0 15px;
    padding-right: 10px;
    span {
    display: block;
    &:first-child {
     color: #888;
    }
    &:last-child {
     color: red;
     font-size: 16px;
    }
    }
   }
   }
  }
  }
 }
 }
</style>