关于vue底部加载更多的代码

要实现的效果如下：

<template>
 <p class="newsList">
 <p v-for="(items, index) in newsList">
 <p class="date">{{showDay(index)}}</p>
 <p 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>
 </p>
 </p>
 <p 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>
 </p>
 </p>
</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>