按需加载的图片

ceoajun · 发表于 2013-1-29 08:42:59

<!DOCTYPE html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>按需加载的图片</title><style type="text/css">img{background:url(loading.gif) no-repeat 50% 50%;}</style></head><body><script type="text/javascript">for(var i=0; i<60; i++){document.write("这里是正文内容 <span style='color:#999;font-size:12px;'>[往下拉动滚动条]</span><br />");}</script><p style="color:red">这是按需加载的图片</p><p><img data_src="http://www.ueder.net/testhtml/picshow/datapic/0e0c883622903fb1a61e12be.jpg" width="400" height="600" src="1.png" alt="" /></p><script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script><script type="text/javascript">var itv;$(window).scroll(function(){ clearTimeout(itv); itv = setTimeout(function(){var winHeight = $(window).height();var scrolltop = $(window).scrollTop();var oTop = $("img").offset().top;if((oTop-scrolltop)>0 && (oTop-scrolltop)<winHeight){var src = $("img").attr("data_src");$("img").attr("src",src)}},500);});</script></body></html>

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