<!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>图片延时加载原生JS特效广告代码</title> <style type="text/css"> body,div,ul,li{margin:0;padding:0;} #box{width:770px;margin:0 auto;padding:10px 0 0 10px;background:#f00;overflow:hidden;zoom:1;} #box li{float:left;width:375px;height:225px;color:#fff;padding:10px 0;display:inline;text-align:center;margin:0 10px 10px 0;background:#000 url(http://js.alixixi.com/demo/yc/img/loading.gif) 50% 50% no-repeat;} #box li img.loaded{width:353px;height:225px;vertical-align:middle;} </style> </head> <script type="text/javascript"> var fgm = { on: function(element, type, handler) { return element.addEventListener ? element.addEventListener(type, handler, false) : element.attachEvent("on" + type, handler) }, bind: function(object, handler) { return function() { return handler.apply(object, arguments) } }, pageX: function(element) { return element.offsetLeft + (element.offsetParent ? arguments.callee(element.offsetParent) : 0) }, pageY: function(element) { return element.offsetTop + (element.offsetParent ? arguments.callee(element.offsetParent) : 0) }, hasClass: function(element, className) { return new RegExp("(^|\\s)" + className + "(\\s|$)").test(element.className) }, attr: function(element, attr, value) { if(arguments.length == 2) { return element.attributes[attr] ? element.attributes[attr].nodeValue : undefined } else if(arguments.length == 3) { element.setAttribute(attr, value) } } }; //延时加载 function LazyLoad(obj) { this.lazy = typeof obj === "string" ? document.getElementById(obj) : obj; this.aImg = this.lazy.getElementsByTagName("img"); this.fnLoad = fgm.bind(this, this.load); this.load(); fgm.on(window, "scroll", this.fnLoad); fgm.on(window, "resize", this.fnLoad); } LazyLoad.prototype = { load: function() { var iScrollTop = document.documentElement.scrollTop || document.body.scrollTop; var iClientHeight = document.documentElement.clientHeight + iScrollTop; var i = 0; var aParent = []; var oParent = null; var iTop = 0; var iBottom = 0; var aNotLoaded = this.loaded(0); if(this.loaded(1).length != this.aImg.length) { for(i = 0; i < aNotLoaded.length; i++) { oParent = aNotLoaded[i].parentElement || aNotLoaded[i].parentNode; iTop = fgm.pageY(oParent); iBottom = iTop + oParent.offsetHeight; if((iTop > iScrollTop && iTop < iClientHeight) || (iBottom > iScrollTop && iBottom < iClientHeight)) { aNotLoaded[i].src = fgm.attr(aNotLoaded[i], "data-img") || aNotLoaded[i].src; aNotLoaded[i].className = "loaded"; } } } }, loaded: function(status) { var array = []; var i = 0; for(i = 0; i < this.aImg.length; i++) eval("fgm.hasClass(this.aImg[i], \"loaded\")" + (!!status ? "&&" : "||") + "array.push(this.aImg[i])"); return array } }; //应用 fgm.on(window, "load", function () {new LazyLoad("box")}); </script> <body> <ul id="box"> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/mobileapp_website/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/HoverSlideEffect/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/FullPageImageGallery/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/CompactNewsPreviewer/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/slideshow/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/ParallaxSlider/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/AnimatedPortfolioGallery/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/CollapsingSiteNavigation/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/ElegantAccordion/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/ImageBoxes/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/zdn/demo.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/730/730.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/729/729.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/728/728.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/727/727.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/726/726.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/725/725.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/724/724.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/723/723.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/722/722.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/721/721.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/720/720.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/719/719.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/718/718.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/717/717.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/716/716.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/715/715.jpg" /></li> <li><img src="http://js.alixixi.com/demo/yc/img/none.gif" data-img="http://js.alixixi.com/demo/714/714.jpg" /></li> </ul> </body> </html>
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