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预加载图片

OperaIEJavaScriptjQueryXHTML 
阅读更多

第一种：

 

<script>

	function preload(path, img, callback)
	{
		for (var i=0; i<img.length; i++)
		{
			var src = path + img[i]
			img[i] = document.createElement("img")
			img[i].style.display = "none"
			img[i].onload = function()
			{
				document.body.removeChild(this)
				this.onload = null
				this.style.display = ""
				if (!--i) callback(img)
			}
			img[i].src = src
			document.body.appendChild(img[i])
		}
	}

onload = function()
{
	preload
	(
		"http://bbs.51js.com/images/smilies/",[
		"sweat.gif",
		"loveliness.gif",
		"call.gif",
		"funk.gif"],
		function (img)
		{
			alert('ok')
			for (var i=0; i<img.length; i++)
			{
				document.body.appendChild(img[i])
			}
		}
	)
}

</script>
 

第二种：

 

<!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://www.baidu.com/img/logo.gif','http://www.baidu.com/img/logo.gif','http://www.baidu.com/img/logo.gif'];
	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>

 

 

第三种：

 

<!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=gb2312" />
<title>图片批量加载</title>
</head>
<body>
<div id="status" ></div>
<div id="processing"></div>
<script type="text/javascript">
function $id(id){ return document.getElementById(id);}
function $c(tagName){ return document.createElement(tagName);}
window.onload = function(){
imageLoad( {
    url:function(v){
        v = [];
        for(var i=1; i<=100; i++){
            v[v.length] = 'http://www.landgame.com.cn/images/game/slg_pic/GifBorder_'+i+'.gif?_='+(new Date).getTime();
        }
        return v;
    },
    oncomplete: function(s){
         $id('status').innerHTML = '正在加载...'+s.complete+'/'+s.total;
         $id('processing').innerHTML = this.src;
    },
    complete:function(imgs, s){
        var $r = $c('div');
        $r.id = 'result';
        $r.innerHTML = '计划加载:'+s.total+', 加载成功:'+s.load+'错误:'+s.error;
        document.body.appendChild($r);
        for(var i=0, l=imgs.length, $m; i<l; i++){
              $m = $c('div');
              $m.innerHTML = (imgs[i].loaded?'加载成功:':'加载失败:')+ imgs[i].src;
              document.body.appendChild($m);
        }
    }
  });
};
//------------------------------------------------------------------------------------------------------------
function imageLoad( s ){
	var urlset = [], undefined, toString = Object.prototype.toString;
	switch( toString.apply(s.url) ){
		case '[object String]': urlset[urlset.length] = s.url; break;
		case '[object Array]': if(!s.url.length){ return false; } urlset = s.url; break;
		case '[object Function]': s.url = s.url(); return imageLoad( s );
		default: return false;
	}
	var imgset =[], r ={ total:urlset.length, load:0, error:0, abort:0, complete:0, currentIndex:0 }, timer,
		_defaults = {
			url:'',
			onload: 'function',
			onerror: 'function',
			oncomplete: 'function',
			ready: 'function',
			complete: 'function',
			timeout: 15
		};
	for( var v in _defaults){
		s[v] = s[v]===undefined? _defaults[v]: s[v];
	}
	s.timeout = parseInt( s.timeout ) || _defaults.timeout;
	timer = setTimeout( _callback, s.timeout*1000);
	// 生成 image 对象数组
	for( var i=0,l=urlset.length,img; i<l; i++){
		img 		= new Image();
		img.loaded	= false;
		imgset[imgset.length] = img;
	}
	// onload & onerror 绑定
	for( i=0,l=imgset.length; i<l; i++){
		imgset[i].onload  	= function(){ _imageHandle.call(this, 'load', i ); };
		imgset[i].onerror 	= function(){ _imageHandle.call(this, 'error', i ); };
		imgset[i].onabort 	= function(){ _imageHandle.call(this, 'abort', i ); };
		imgset[i].src 		= ''+urlset[i];
	}
	// ready 事件回调
	if( _isFn(s.ready) ){ s.ready.call({}, imgset, r); }	
	// onload & onerror 句柄
	function _imageHandle( handle, index ){
		r.currentIndex = index;
		switch( handle ){
			case 'load':
				this.onload  = null; this.loaded = true; r.load++;
				// onload 事件回调
				if( _isFn(s.onload) ){ s.onload.call(this, r); }	
				break;
			case 'error': r.error++;
				// onerror 事件回调
				if( _isFn(s.onerror) ){ s.onerror.call(this, r); }
				break;
			case 'abort': r.abort++; break;
		}
		r.complete++;
		// oncomplete 事件回调
		if( _isFn(s.oncomplete) ){ s.oncomplete.call(this, r); }
		// 判断全局加载
		if( r.complete===imgset.length ){  _callback(); }
	}
	function _callback(){
		clearTimeout( timer );
		if( _isFn(s.complete) ){ s.complete.call({}, imgset, r); }
	}
	function _isFn(fn){ return toString.apply(fn)==='[object Function]'; }
	return true;
}
</script>
</body>
</html>
 

 

 

 

链接主题：

javascript图片浏览器的核心——图片预加载

延迟加载图片 Lazy Load

jQuery 页面载入进度条 (必有一款适合你----综合搜集版)

 

 

 

 

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