又一个小巧的图片预加载类_图象特效

 代码如下:






var IE=navigator.appName=="Microsoft Internet Explorer";
var Opera=navigator.appName.toLowerCase()=="opera";
var FF=!IE && !Opera;
function LoadImage(arrSrc,callBack)
{
this.Length=arrSrc.length;
this.LoadedLen=0; //已经被加载的图片个数
var self=this;
if(self.Length<1)
{
callBack(arrSrc);
return;
}

//经测试,OPERA与别的浏览器加载方式不同,所以特别独立开来...
if(Opera)
{
for(var i=0;i {
var tmpImg=new Image();
tmpImg.src=arrSrc[i];
tmpImg.onload=function()
{
self.LoadedLen++;
if(self.LoadedLen==self.Length && callBack) callBack(arrSrc);
}
}
return;
}

this.Load=function()
{
self.LoadedLen++;
document.getElementById("counter").innerHTML=self.LoadedLen;
if(self.LoadedLen else if(callBack) callBack(arrSrc);
}

this.DownImg=function()
{
var tmpImg=new Image();
tmpImg.src=arrSrc[self.LoadedLen];
if(IE)
{
if(tmpImg.readyState=="complete") self.Load();
else tmpImg.onreadystatechange=function()
{
if(this.readyState=="complete") self.Load();
}
}
else tmpImg.onload=self.Load;
}
this.DownImg();
}
//-->





var arr=['http://photo.hjbbs.com/photo/20060531/20060531103027226_756_o.jpg','http://img1.soufun.com/bbs/2007_02/13/1171345302199.jpeg','http://img.c8c8.cn/2006/09/09/15032/pp20060909002749.jpg'];
var t=new LoadImage(arr,function(arr)
{

var str="";
for(var i=0;i {
str+="
";
}
document.body.innerHTML+=str;
});
//-->