vue底部加载更多的实例代码

<template> <div class="newsList">  <div v-for="(items, index) in newsList">   <div class="date">{{showDay(index)}}</div>   <div class="list" >    <ul>     <li class="list-item" v-for="item in items">      <span class="text">{{item.title}}</span>      <img :src="attachImageUrl(item.images[0])" class="image"/>     </li>    </ul>   </div>  </div>  <div class="infinite-scroll" v-show="loading">   <svg class="loader-circular" viewBox="25 25 50 50">    <circle class="loader-path" cx="50" cy="50" r="20" fill="none" stroke="rgb(53, 157, 218)" stroke-width="5"></circle>   </svg>   <span class="infinite-scroll-text">{{tips}}</span>  </div> </div></template><script> import axios from 'axios'; export default {  data () {   return {    newsList: [],    date: [],    todayDate: '',    REQUIRE: true,    loading: false,    tips: '努力加载中...'   }  },  created () {   // 获取今日新闻   axios.get('http://zhihuapi.herokuapp.com/api/4/news/latest')    .then( (res) => {    this.newsList.push(res.data['stories'])    this.date.push(res.data['date']);    this.todayDate = res.data['date']   })  },  mounted () {   // 添加滚动事件，检测滚动到页面底部   window.addEventListener('scroll', this.scrollBottom)  },  methods: {   scrollBottom() {    // 滚动到页面底部时，请求前一天的文章内容    if (((window.screen.height + document.body.scrollTop) > (document.body.clientHeight)) && this.REQUIRE) {     // 请求的数据未加载完成时，滚动到底部不再请求前一天的数据     this.REQUIRE = false;     this.loading = true;     this.tips = '努力加载中...';     axios.get('http://zhihuapi.herokuapp.com/api/4/news/before/' + this.todayDate).then((res) => {      this.newsList.push(res.data['stories']);     this.date.push(res.data['date']);     this.todayDate = res.data['date'];     // 请求的数据加载完成后，再次滚动到底部时，允许请求前一天数据     this.$nextTick(() => {      this.REQUIRE = true;      this.loading = false;     });    }).catch(() => {      this.tips = '连接失败，请稍后重试';     // 请求失败时，将 REQUIRE 置为 true，滚动到底部时，再次请求     this.REQUIRE = true;    });    }   },   showDay (index) {    if (index === 0) {     return '今日新闻'    } else {     return this.getToday(index)    }   },   getToday (index) {    let year = this.date[index].slice(0, 4);    let month = this.date[index].slice(4, 6);    let day = this.date[index].slice(6);    let today = new Date(year + '/' + month + '/' + day);    let week = ['日', '一', '二', '三', '四', '五', '六'];    return month + '月' + day + '日' + ' 星期' + week[today.getDay()];   },   attachImageUrl (srcUrl) {    if (srcUrl !== undefined) {     return 'http://read.html5.qq.com/image?src=forum&q=5&r=0&imgflag=7&imageUrl=' + srcUrl.slice(0, 4) + srcUrl.slice(5);    }   }  } }</script>