/*! * jquery.scrollLoading.js*/ (function($) { $.fn.scrollLoading = function(options) { var defaults = { attr: "data-original", container: $(window), callback: $.noop }; var params = $.extend({}, defaults, options || {}); params.cache = []; $(this).each(function() { var node = this.nodeName.toLowerCase(), url = $(this).attr(params["attr"]); //重组 var data = { obj: $(this), tag: node, url: url }; params.cache.push(data); }); var callback = function(call) { if ($.isFunction(params.callback)) { params.callback.call(call.get(0)); } }; //动态显示数据 var loading = function() { var contHeight = params.container.height(); if (params.container.get(0) === window) { contop = $(window).scrollTop(); } else { contop = params.container.offset().top; } $.each(params.cache, function(i, data) { var o = data.obj, tag = data.tag, url = data.url, post, posb; if (o) { post = o.offset().top - contop, posb = post + o.height(); if ((post >= 0 && post < contHeight) || (posb > 0 && posb <= contHeight)) { if (url) { //在浏览器窗口内 if (tag === "img") { //图片，改变src callback(o.attr("src", url)); } else { o.load(url, {}, function() { callback(o); }); } } else { // 无地址，直接触发回调 callback(o); } data.obj = null; } } }); }; //事件触发 //加载完毕即执行 loading(); //滚动执行 params.container.bind("scroll", loading); }; })(jQuery);
<!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> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>延时加载</title> <style type="text/css"> body,div,{margin:0;padding:0;} #box{770px;margin:0 auto;padding:10px 0 0 10px;overflow:hidden;zoom:1;} #box img{float:left;375px;height:225px;color:#fff;padding:10px 0;display:inline;text-align:center;margin:0 10px 10px 0;background:#000 url(http://fgm.cc/learn/lesson10/img/lazy/loading.gif) 50% 50% no-repeat;} #box img.loaded{353px;height:225px;vertical-align:middle;} </style> </head> <body> <div id="box"> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/1.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/2.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/3.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/4.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/5.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/6.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/7.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/8.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/9.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/10.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/11.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/12.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/13.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/14.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/15.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/16.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/17.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/18.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/19.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/20.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/21.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/22.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/23.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/24.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/25.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/26.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/27.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/28.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/29.jpg" /> <img src="http://fgm.cc/learn/lesson10/img/lazy/none.gif" data-img="http://fgm.cc/learn/lesson10/img/lazy/30.jpg" /> </div> <script src="http://code.jquery.com/jquery-1.8.2.min.js"></script> <script type="text/javascript"> $(function(){ showimg();//加载第一屏 $(window).scroll(function(){ showimg();//显示当前滚动位置一下两屏且没有被加载的图片 }); }); function showimg(){ var vtop=$(document).scrollTop();//滚动条滚动的距离 var wheight=$(window).height();//窗口高度 $("#box img").each(function(){//遍历img var truesrc=$(this).attr("data-img");//获取真实图片地址 if(truesrc&&$(this).offset().top<=(wheight+vtop)){ //如果truesrc存在且有值的时候加载。 $(this).attr("src",truesrc).removeAttr("data-img");//赋值真实图片地址并移除truesrc属性防止重复加载。 } }); } </script> </body> </html>