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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="http://kejian.jirengu.com/static/js/jquery-1.11.1.min.js"></script>
<style>
html,body,h2,p,ul,li{
margin: 0;
padding: 0;
}
a{
color:#333;
text-decoration: none;
}
.container{
max-width: 600px;
margin:0 auto;
}
.item{
margin-top: 20px;
list-style:none;
}
.item:after{
content: '';
display: block;
clear: both;
}
.item img{
width:50px;
height: 50px;
float:left;
}
.item h2{
margin-left: 60px;
font-size: 14px;
}
.item p{
margin-left: 60px;
font-size: 14px;
}
.load-more{
visibility: hidden;
margin: 3px;
height: 3px;
}
</style>
</head>
<body>
<div class="container">
<ul class="news">
<li class="item">
<a href="#">
<img src="http://inews.gtimg.com/newsapp_ls/0/1850819763_150120/0" alt="">
<h2>乐视网原第二大股东:呼吁成立“困境基金”挺贾跃亭</h2>
<p>鑫根将联合其他股东,成立“困境基金”对乐视...</p>
</a>
</li>
<li class="item">
<a href="#">
<img src="http://inews.gtimg.com/newsapp_ls/0/1850426285_150120/0" alt="">
<h2>独家还原孙杨48小时:累趴在泳池边 6次泡冰桶</h2>
<p>铁一般的“劳模”孙杨,也不禁直呼太累...</p>
</a>
</li>
<li class="item">
<a href="#">
<img src="http://inews.gtimg.com/newsapp_ls/0/1850426285_150120/0" alt="">
<h2>独家还原孙杨48小时:累趴在泳池边 6次泡冰桶</h2>
<p>铁一般的“劳模”孙杨,也不禁直呼太累...</p>
</a>
</li>
<li class="item">
<a href="#">
<img src="http://inews.gtimg.com/newsapp_ls/0/1850426285_150120/0" alt="">
<h2>独家还原孙杨48小时:累趴在泳池边 6次泡冰桶</h2>
<p>铁一般的“劳模”孙杨,也不禁直呼太累...</p>
</a>
</li>
</ul>
<!--在内容的底部埋入一个dom节点p,设置为用户看不到,当滚动至此节点出现,就发送ajax请求,向后台请求数据-->
<p class="load-more"></p>
</div>
<script>
var pageIndex = 0;
var isOver = false;
var isNewsArrive = true;
getNews();
$(window).on('scroll', checkNews)
function checkNews(){
if( isShow($('.load-more')) && !isOver && isNewsArrive ){
getNews()
}
}
function getNews(){
isNewsArrive = false;
$.get('/getNews',{page: pageIndex}).done(function(ret){
isNewsArrive = true;
if(ret.status === 0){
pageIndex++;
appendHtml(ret.data)
checkNews()
}else{
console.log('获取新闻出错')
}
}).fail(function(){
console.log('系统异常')
})
}
// 判断元素是否出现在视野中
function isShow($node){
console.log('show ', $node)
var windowHeight = $(window).height(),
scrollTop = $(window).scrollTop(),
offsetTop = $node.offset().top,
nodeHeight = $node.height();
if(windowHeight + scrollTop > offsetTop && scrollTop < offsetTop + nodeHeight){
return true;
}else{
return false;
}
}
//判读元素是不是加载过
/*function isLoaded($item){
return $item.attr('data-src') === $img.attr('src')
}
//加载图片
function loadImg($img){
$img.attr('src',$img.attr('data-src'))
}
*/
/*
[
{
link: '',
img: '',
title: '',
brif: ''
},
{}
]
{
p:0 //0-4
}
p:1 //5-9
<li class="item">
<a href="#">
<img src="http://inews.gtimg.com/newsapp_ls/0/1850819763_150120/0" alt="">
<h2>乐视网原第二大股东:呼吁成立“困境基金”挺贾跃亭</h2>
<p>鑫根将联合其他股东,成立“困境基金”对乐视...</p>
</a>
</li>
*/
function appendHtml(news){
if(news.length === 0){
isOver = true;
$('.container').append('<p>没有更多数据了~</p>')
return;
}
var htmls = '';
$.each(news, function(){
htmls += '<li class="item">';
htmls += '<a href="'+this.link+'">';
htmls += '<img src="'+this.img+'" alt="">';
htmls += '<h2>'+this.title+'</h2>';
htmls += '<p>'+this.brief+'</p>';
htmls += '</a></li>';
})
$('.news').append(htmls);
}
</script>
</body>
</html>