jQuery延迟加载，当用到图片时才加载，只加载当前屏幕的图片

发布时间：2018-08-21 00:19:04 所属栏目：Asp教程来源：站长网

导读：jQuery 延迟加载，当用到图片时才加载，只加载当前屏幕的图片。也就是当拖动IE的滚动条时，下面的内容才会被加载，先获取窗口高度、判断图片是否到一半，滚动刷新、遍历、获取当前img URL地址等。拖动网页的滚动条，慢慢看一下图片的变化，当你把滚动条拖

　　jQuery延迟加载，当用到图片时才加载，只加载当前屏幕的图片。也就是当拖动IE的滚动条时，下面的内容才会被加载，先获取窗口高度、判断图片是否到一半，滚动刷新、遍历、获取当前img URL地址等。

　　拖动网页的滚动条，慢慢看一下图片的变化，当你把滚动条拖动到哪里，哪里的图片就开始被载入。

　　为解决一些网页特效运行后不能显示效果（例如：jQuery则需要刷新）问题，烈火特别新增网页版演示。

　　点击查看：网页特效

　　运行演示：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>jQuery延时加载，当用到图片时才加载，只加载当前屏幕的图片</title> <meta http-equiv="content-type" content="text/html;charset=gb2312"> <style type="text/css"> *{border:0;} a{display:inline;float:left;margin:55px;background:#ccc;overflow:hidden;font-size:0;} </style> <script src="/uploads/common/js/jquery-1.4.2.min.js" type="text/javascript" language="javascript"></script> <script type="text/javascript"> $(function(){ var $winH = $(window).height();//获取窗口高度 var $img = $("#show img"); var $imgH = parseInt($img.height()/2);//图片到一半的时候显示 var $srcDef = "a.gif"; runing();//页面刚载入时判断要显示的图片 $(window).scroll(function(){ runing();//滚动刷新 }) function runing(){ $img.each(function(i){//遍历img var $src = $img.eq(i).attr("original");//获取当前img URL地址 var $scroTop = $img.eq(i).offset();//获取图片位置 if($scroTop.top + $imgH >= $(window).scrollTop() && $(window).scrollTop() + $winH >= $scroTop.top + $imgH){//判断窗口至上往下的位置 if($img.eq(i).attr("src") == $srcDef){ $img.eq(i).hide(); } $img.eq(i).attr("src",function(){return $src}).fadeIn(300);//元素属性交换 } }) } }) </script> </head> <body> 预览效果时左下角会提示错误，而且看不到效果，刷新一下就可以看到效果了。<br> <div id="show"> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p4.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p4.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p5.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p1.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p5.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p4.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p5.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p3.jpg"></a> <a href="#"><img src="/uploads/common/images/p1.jpg" width="160" height="160" original="/uploads/common/images/p2.jpg"></a> </div> </body> </html><br /><center>如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.veryhuo.com/' target='_blank'>http://www.veryhuo.com/</a></center>
提示：可修改后代码再运行!

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