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特点：
1.图片预载入，载入后再显示。意图一次呈现，不会让一块一块下载破坏你的页面，绝佳的用户体验，颠覆传统的浏览器呈现图片的处理方式（需要后续函数支持）。
2.不会因载入图片造成脚本暂停假死，完全另一线程进行。不影响主程序流程。
3.提供及时的反馈，包括两方面的内容：1.正在载入什么图片 2.当前的百分数进度。大大提高留住用户眼球的概率，不会让用户因为苦等而离开。
4.容错支持，即使某个图片没有成功下载，也可以设置超时时间以便处理下一个图片。
5.多变的参数类型，尽最大可能方便使用。
复制代码 代码如下:
// save this as "image_loader.js"
//-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-//
/*
ImageLoader, Version 1.1, JavaScript
(c) 2006 Christian An <anchangsi@gmail.com>
With copyright not modified, you can use this program freely.
*/
//-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-//
function ImageLoader(className,Options){
this._ImageLoadStack = null;
this._currrentLoading = "";
this._FinalRun = false;
this.numLoaded = 0;
this.ClassName = className;
if(typeof(Options)=="undefined") Options = {};
if(isNaN(Options.Timeout) || Options.Timeout < 0 || Options.Timeout >100000){
this.EnableTimeout = false;
}else {
this.EnableTimeout = true;
this.Timeout = Options.Timeout;
}
if(typeof(Options.func)=="undefined"){
this.AfterFunction = null;
}else{
this.AfterFunction = Options.func;
}
if(typeof(Options.display)=="undefined"){
this.disDiv = null;
}else if(typeof(Options.display)=="string"){
this.disDiv = document.getElementById(Options.display);
}else if(typeof(Options.display)=="object"){
this.disDiv = Options.display;
}else{
this.disDiv = null;
}
if(typeof(Options.process)=="undefined"){
this.procDiv = null;
}else if(typeof(Options.process)=="string"){
this.procDiv = document.getElementById(Options.process);
}else if(typeof(Options.process)=="object"){
this.procDiv = Options.process;
}else{
this.procDiv = null;
}
if(typeof(document.imageArray)=="undefined") document.imageArray = new Array();
this.Load = function(){
var args = this.Load.arguments;
if(args.length!=0){
this._ImageLoadStack = new Array();
for(i=0; i<args.length; i++){
if(args[i].indexOf("#")!=0){
this._ImageLoadStack.push(args[i]);
}
}
}else if(this._ImageLoadStack == null){
this._runFinal();
}
this.numTotal = this._ImageLoadStack.length;
this._LoadAImage();
}
this._LoadAImage = function(){
if(this._ImageLoadStack.length!=0){
var sURL = this._ImageLoadStack.shift();
if(this.disDiv!=null) this.disDiv.innerHTML = sURL;
_currrentLoading = sURL;
var j = document.imageArray.length;
document.imageArray[j] = document.createElement("IMG");
document.imageArray[j].Owner = this;
document.imageArray[j].onload = function(){
this.Owner._LoadAImage();
this.onload = null;
}
document.imageArray[j].onerror = function(){
this.Owner._LoadAImage();
this.onload = null;
}
if(this.EnableTimeout){
window.setTimeout("if(_currrentLoading==\""+sURL+"\"){"+this.ClassName+"._LoadAImage()}",this.Timeout);
}
document.imageArray[j++].src = sURL;
if(this.procDiv!=null){
this.numLoaded++;
var percentage = Math.floor(this.numLoaded * 100 / this.numTotal);
this.procDiv.innerHTML = percentage;
}
}else{
this._runFinal();
}
}
this._runFinal = function(){
if(this._FinalRun == false){
this._FinalRun = true;
if(typeof(this.AfterFunction)=="function"){
this.AfterFunction();
}else if(typeof(this.AfterFunction)=="string"){
if (window.execScript){
window.execScript(this.AfterFunction);
}else{
window.eval(this.AfterFunction);
}
}
}
}
this.setLoadImages = function(imageArray){
if(typeof(imageArray)!="object") return;
this._ImageLoadStack = imageArray;
}
}
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发表于 2006-10-3 00:00:00
