jQuery实现鼠标滚动图片延迟加载效果附源码下载

琳尼克斯

2016-06-28

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这里延迟加载的意思是，拖动滚动条时，在图片出现在浏览器显示区域后才加载显示。在这之前全部图片都由一张图片代替。节省流量，减轻服务器负担。

请用鼠标或者键盘方向键使页面向下滚动，注意图片的变化。本特效没有使用专门的图片延迟加载插件，只需要一小段jQuery代码就实现了图片延迟加载，使用非常方便。在本文后面附有源码下载。

效果展示源码下载

用到的加载中的图片：

代码如下：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>jQuery鼠标滚动页面图片延迟加载_何问起</title><base target="_blank" />
<meta name="description" content="何问起">
<meta name="keywords" content="何问起">
<link href="" rel="stylesheet">
<style type="text/css">
* {
margin: 0;
padding: 0;
border: 0;
}
.hovertreebox {
padding-top: 800px;
}
.img_hovertreebox {
float: left;
width: 33%;
text-align: center;
margin-bottom: 100px;
}
.hovertreeinfo{text-align:center;}
.hovertreeinfo a{color:blue;}
</style>
<script type="text/javascript" src="http://down.hovertree.com/jquery/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(function(){
$(window).scroll(function(event) {
var ah=$(window).scrollTop();
var ch=$(window).height()
$('.img_hovertreebox').each(function(){
var bh=$(this).offset().top;
if(ch+ah-200>bh){
var a=$(this).find('img').attr("load_src");
$(this).find('img').attr("src",a);
}
})
});
})
</script>
</head>
<body>
<div class="hovertreeinfo"><h1>jQuery鼠标滚动页面图片延迟加载</h1>
请向下滚动页面。注意图片的变化。
<a href="http://hovertree.com">何问起</a>
<a href="http://hovertree.com/menu/texiao/">网页特效</a>
<a href="http://hovertree.com/h/bjaf/yanchijaizai.htm">代码说明</a>
</div>
<div class="hovertreebox">
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img1.png">
</div>
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img2.png">
</div>
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img3.png">
</div>
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img4.png">
</div>
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img5.png">
</div>
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img6.png">
</div>
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img7.png">
</div>
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img8.png">
</div>
<div class="img_hovertreebox">
<img src="http://hovertree.com/texiao/jqimg/7/img/load.gif" load_src="http://hovertree.com/texiao/jqimg/7/img/img9.png">
</div>
</div>
</body>
</html>

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