要实现的效果如下：
<template> <div> <div v-for="(items, index) in newsList"> <div>{{showDay(index)}}</div> <div > <ul> <li v-for="item in items"> <span>{{item.title}}</span> <img :src="attachImageUrl(item.images[0])"/> </li> </ul> </div> </div> <div v-show="loading"> <svg viewBox="25 25 50 50"> <circle cx="50" cy="50" r="20" fill="none" stroke="rgb(53, 157, 218)" stroke-width="5"></circle> </svg> <span>{{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 + 'https://www.jb51.net/' + month + 'https://www.jb51.net/' + 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>
总结
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