<html> <title>图片预加载</title> <body> <script> //判断浏览器 var Browser=new Object(); Browser.userAgent=window.navigator.userAgent.toLowerCase(); Browser.ie=/msie/.test(Browser.userAgent); Browser.Moz=/gecko/.test(Browser.userAgent); //判断是否加载完成 function Imagess(url,imgid,callback){ var val=url; var img=new Image(); if(Browser.ie){ img.onreadystatechange =function(){ if(img.readyState=="complete"||img.readyState=="loaded"){ callback(img,imgid); } } }else if(Browser.Moz){ img.onload=function(){ if(img.complete==true){ callback(img,imgid); } } } //如果因为网络或图片的原因发生异常，则显示该图片 img.onerror=function(){img.src='http://www.baidu.com/img/baidu_logo.gif'} img.src=val; } //显示图片 function checkimg(obj,imgid){ document.getElementById(imgid).src=obj.src; } //初始化需要显示的图片，并且指定显示的位置 window.onload=function(){ Imagess("http://hiphotos.baidu.com/lovebyakuya/pic/item/01cf20088f9506f063d98653.jpg","img1",checkimg); Imagess("http://hiphotos.baidu.com/lovebyakuya/pic/item/7b7b19c70d62f4fdd0006050.jpg","img2",checkimg); Imagess("http://hiphotos.baidu.com/joanne728/pic/item/892557641806d20eaa184c71.jpg","img3",checkimg); Imagess("http://www.neocha.com/-/res/Camilla/20071204181216078845_h.jpg","img4",checkimg); Imagess("http://www.neocha.com/-/res/Camilla/20071204181216d078845_h.","img5",checkimg); } </script> <img id="img1" src="loading.gif" width="100" height="100" /> <img id="img2" src="loading.gif" width="100" height="100" /> <img id="img3" src="loading.gif" width="100" height="100" /> <img id="img4" src="loading.gif" width="100" height="100" /> <img id="img5" src="loading.gif" width="100" height="100" /> </body> </html>