<img class="lazy" data-original="/static/images/default/icon10.png" src="/static/images/default/example.jpg" width="40" height="40" />
example.jpg为1px的图片
引用公共jquery库和jquery.lazyload.min.js：
jquery.lazyload.min.js：
/*
* Lazy Load - jQuery plugin for lazy loading images
*
* Copyright (c) 2007-2012 Mika Tuupola
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
*
* Project home:
* http://www.appelsiini.net/projects/lazyload
*
* Version: 1.8.2
*
*/
(function(a,b,c,d){var e=a(b);a.fn.lazyload=function(f){function j(){var b=0;g.each(function(){var c=a(this);if(i.skip_invisible&&!c.is(":visible"))return;if(!a.abovethetop(this,i)&&!a.leftofbegin(this,i))if(!a.belowthefold(this,i)&&!a.rightoffold(this,i))c.trigger("appear"),b=0;else if(++b>i.failure_limit)return!1})}var g=this,h,i={threshold:0,failure_limit:0,event:"scroll",effect:"show",container:b,data_attribute:"original",skip_invisible:!0,appear:null,load:null};return f&&(d!==f.failurelimit&&(f.failure_limit=f.failurelimit,delete f.failurelimit),d!==f.effectspeed&&(f.effect_speed=f.effectspeed,delete f.effectspeed),a.extend(i,f)),h=i.container===d||i.container===b?e:a(i.container),0===i.event.indexOf("scroll")&&h.bind(i.event,function(a){return j()}),this.each(function(){var b=this,c=a(b);b.loaded=!1,c.one("appear",function(){if(!this.loaded){if(i.appear){var d=g.length;i.appear.call(b,d,i)}a("<img />").bind("load",function(){c.hide().attr("src",c.data(i.data_attribute))[i.effect](i.effect_speed),b.loaded=!0;var d=a.grep(g,function(a){return!a.loaded});g=a(d);if(i.load){var e=g.length;i.load.call(b,e,i)}}).attr("src",c.data(i.data_attribute))}}),0!==i.event.indexOf("scroll")&&c.bind(i.event,function(a){b.loaded||c.trigger("appear")})}),e.bind("resize",function(a){j()}),/iphone|ipod|ipad.*os 5/gi.test(navigator.appVersion)&&e.bind("pageshow",function(b){b.originalEvent.persisted&&g.each(function(){a(this).trigger("appear")})}),a(c).ready(function(){j()}),this},a.belowthefold=function(c,f){var g;return f.container===d||f.container===b?g=e.height()+e.scrollTop():g=a(f.container).offset().top+a(f.container).height(),g<=a(c).offset().top-f.threshold},a.rightoffold=function(c,f){var g;return f.container===d||f.container===b?g=e.width()+e.scrollLeft():g=a(f.container).offset().left+a(f.container).width(),g<=a(c).offset().left-f.threshold},a.abovethetop=function(c,f){var g;return f.container===d||f.container===b?g=e.scrollTop():g=a(f.container).offset().top,g>=a(c).offset().top+f.threshold+a(c).height()},a.leftofbegin=function(c,f){var g;return f.container===d||f.container===b?g=e.scrollLeft():g=a(f.container).offset().left,g>=a(c).offset().left+f.threshold+a(c).width()},a.inviewport=function(b,c){return!a.rightoffold(b,c)&&!a.leftofbegin(b,c)&&!a.belowthefold(b,c)&&!a.abovethetop(b,c)},a.extend(a.expr[":"],{"below-the-fold":function(b){return a.belowthefold(b,{threshold:0})},"above-the-top":function(b){return!a.belowthefold(b,{threshold:0})},"right-of-screen":function(b){return a.rightoffold(b,{threshold:0})},"left-of-screen":function(b){return!a.rightoffold(b,{threshold:0})},"in-viewport":function(b){return a.inviewport(b,{threshold:0})},"above-the-fold":function(b){return!a.belowthefold(b,{threshold:0})},"right-of-fold":function(b){return a.rightoffold(b,{threshold:0})},"left-of-fold":function(b){return!a.rightoffold(b,{threshold:0})}})})(jQuery,window,document)
调用方法：
<script language="javascript">
$(function(){
jQuery("img.lazy").lazyload({threshold :200,failure_limit : 30});
})
</script>
