又一个小巧的图片预加载类

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我是靠谱客的博主坦率黑米，最近开发中收集的这篇文章主要介绍又一个小巧的图片预加载类，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

复制代码代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<HTML> 
<HEAD> 
<TITLE> New Document </TITLE> 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 
<SCRIPT LANGUAGE="JavaScript"> 
<!-- 
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<self.Length;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<self.Length)    self.DownImg(); 
        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(); 
} 
//--> 
</SCRIPT> 
</HEAD> 
<BODY> 
<div id="counter"></div> 
 <SCRIPT LANGUAGE="JavaScript"> 
 <!-- 
    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<arr.length;i++) 
        { 
            str+="<img src='"+arr[i]+"' /><br>"; 
        } 
        document.body.innerHTML+=str; 
    }); 
 //--> 
 </SCRIPT> 
</BODY> 
</HTML>