JS/CSS点小图弹大图实例代码_图片特效特效

JavaScript/CSS共同实现点小图弹大图效果代码，兼容IE6/7/8，火狐下表现也不错，代码中有注释，使用前请注意注释部分的代码。

<!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" xml:lang="zh">
<head>
	<title>小图弹大图</title>
	<style type="text/css">
		body { background:#f1f1f1; margin:0 }
		#workDemo { width:100%; }
		#workDemo a { width: 150px; height:90px; margin:5px; padding:0; border:gray 5px solid; float:left; overflow:hidden; text-decoration:none; display:block; position:relative }
		#workDemo a span { display:none; }
		#workDemo a img { border:none; }
		#workDemo a:hover { border-color:red; }
		#workDemo a:hover span { position:absolute; background:red; color:white; width:100%; padding-top:3px; text-align:center;  right:0; bottom:0; display:block; font-size:11px; filter: Alpha(Opacity=60);Opacity:0.6; }
	</style>
</head>
<body>
<div id="workDemo">
<a href="#"><img src="http://p1.mb5u.com/texiao/1/20110225160551608.jpg" /><span>把浏览器窗口放小后点击</span></a>
<a href="#"><img src="http://p1.mb5u.com/texiao/1/20110225160551609.jpg" /><span>把浏览器窗口放小后点击</span></a>
</div>
<script type="text/javascript">
function ImgShow(evt){
	var imgTag=(window.event)?event.srcElement:evt.target;
	var imgPath=imgTag.src.replace(/\_\d\./,"_4.");//取得弹出的大图url
	var tagTop=Math.max(document.documentElement.scrollTop,document.body.scrollTop);
	var tag=document.createElement("div");
		tag.style.cssText="width:100%;height:"+Math.max(document.body.clientHeight,document.body.offsetHeight,document.documentElement.clientHeight)+"px;position:absolute;background:black;top:0;filter: Alpha(Opacity=80);Opacity:0.8;";
		tag.ondblclick=closes;
	var tagImg=document.createElement("div");
		tagImg.style.cssText="font:12px /18px verdana;overflow:auto;text-align:center;position:absolute;width:200px;border:5px solid white;background:white;color:white;left:"+(parseInt(document.body.offsetWidth)/2-100)+"px;top:"+(document.documentElement.clientHeight/3+tagTop)+"px;"
		tagImg.innerHTML="<div style='padding:10px;background:#cccccc;border:1px solid white'><img src='http://p1.mb5u.com/texiao/1/20110225160551610.gif' /><br /><br /><b style='color:#999999;font-weight:normal'>Image loading...</b><br /></div>";
		tagImg.oncontextmenu=function(){var clsOK=confirm("确定要取消图片显示吗?点击确定将关闭图片。\n如果您是想缩放图片请在图片上双击。"); if(clsOK){closes();};return false};
	var closeTag=document.createElement("div");
		closeTag.style.cssText="display:none;position:absolute;left:10px;top:10px;color:black;";
		var closesHtml="<b style='background:red;border:1px solid white;filter:Alpha(Opacity=50);Opacity:0.5;cursor:pointer;'>&nbsp;关闭&nbsp;</b>";
		closeTag.innerHTML=closesHtml+" 提示:双击图片缩放";
		closeTag.onclick=closes;
	document.body.appendChild(tag);
	document.body.appendChild(tagImg);
	var img=new Image();
		img.src=imgPath;
		img.style.cssText="border:1px solid #cccccc;filter: Alpha(Opacity=0);Opacity:0;cursor:pointer";
	var barShow,imgTime;
	img.complete?ImgOK():img.onload=ImgOK;
	function ImgOK(){
		var Stop1=false,Stop2=false,temp=0;
		var tx=tagImg.offsetWidth,ty=tagImg.offsetHeight;
		var ix=img.width,iy=img.height;
		var sx=document.documentElement.clientWidth,sy=window.innerHeight||document.documentElement.clientHeight;
		if(iy>sy||ix>sx){
				var yy=sy-100;
				var xx=(ix/iy)*yy;
		}else{
			var xx=ix+4;
			var yy=iy+3;
		}
			img.style.width=xx-4+'px';
			img.style.height=yy-3+'px';
		if(ix<sx&&iy<sy){tagImg.alt="";closeTag.innerHTML=closesHtml;};
		var maxTime=setInterval(function(){
			temp+=35;
			if((tx+temp)<xx){
				tagImg.style.width=(tx+temp)+"px";
				tagImg.style.left=(sx-(tx+temp))/2+"px";
			}else{
				Stop1=true;
				tagImg.style.width=xx+"px";
				tagImg.style.left=(sx-xx)/2+"px";
			}
			if((ty+temp)<yy){
				tagImg.style.height=(ty+temp)+"px";
				tagImg.style.top=(tagTop+((sy-(ty+temp))/2))+"px";
			}else{
				Stop2=true;
				tagImg.style.height=yy+"px";
				tagImg.style.top=(tagTop+((sy-yy)/2))+"px";
			}
			if(Stop1&&Stop2){
				clearInterval(maxTime);
				tagImg.appendChild(img);
				temp=0;
				imgOPacity();
			}
		},1);
		function imgOPacity(){
			temp+=10;
			img.style.filter="alpha(opacity="+temp+")";
			img.style.opacity=temp/100;
			imgTime=setTimeout(imgOPacity,1)
			if(temp>100) clearTimeout(imgTime);
		}
		tagImg.innerHTML="";
		tagImg.appendChild(closeTag);
			
		if(ix>xx||iy>yy){
			img.alt="左键拖动,双击放大缩小";
			img.ondblclick=function (){
				if(tagImg.offsetWidth<img.offsetWidth||tagImg.offsetHeight<img.offsetHeight){
					img.style.width="auto";
					img.style.height="100%";
					img.alt="双击可以放大";
					img.onmousedown=null;
					closeTag.style.top="10px";
					closeTag.style.left="10px";
					tagImg.style.overflow="visible";
					tagImg.style.width=img.offsetWidth+"px";
					tagImg.style.left=((sx-img.offsetWidth)/2)+"px";
				}else{
					img.style.width=ix+"px";
					img.style.height=iy+"px";
					img.alt="双击可以缩小";
					img.onmousedown=dragDown;
					tagImg.style.overflow="auto";
					tagImg.style.width=(ix<sx-100?ix+20:sx-100)+"px";
					tagImg.style.left=((sx-(ix<sx-100?ix+20:sx-100))/2)+"px";
				}
			}
			img.onmousedown=dragDown;
			tagImg.onmousemove=barHidden;
			tagImg.onmouseout=moveStop;
			document.onmouseup=moveStop;
		}else{
			tagImg.style.overflow="visible";
			tagImg.onmousemove=barHidden;
		}
	}
	function dragDown(a){
		img.style.cursor="move";
		var evts=a||window.event;
		var onx=evts.clientX,ony=evts.clientY;
		var sox=tagImg.scrollLeft,soy=tagImg.scrollTop;
		var sow=img.width+2-tagImg.clientWidth,soh=img.height+2-tagImg.clientHeight;
		var xxleft,yytop;
		document.onmousemove=function(e){
			var evt=e||window.event;
			xxleft=sox-(evt.clientX-onx)<0?"0":sox-(evt.clientX-onx)>sow?sow:sox-(evt.clientX-onx);
			yytop=soy-(evt.clientY-ony)<0?"0":soy-(evt.clientY-ony)>soh?soh:soy-(evt.clientY-ony);
			tagImg.scrollTop=yytop;
			tagImg.scrollLeft=xxleft;
			closeTag.style.top=(yytop+10)+"px";
			closeTag.style.left=(xxleft+10)+"px";
			return false;
		}
		return false;
	}
	function barHidden(){
		clearTimeout(barShow);
		closeTag.style.top=(tagImg.scrollTop+10)+"px";
		closeTag.style.left=(tagImg.scrollLeft+10)+"px";
		if(closeTag.style.display=="none")closeTag.style.display="block";
		barShow=setTimeout(function(){closeTag.style.display="none";},1000);
	}
	function closes(){
		document.body.removeChild(tag);
		document.body.removeChild(tagImg);
		clearTimeout(barShow);
		clearTimeout(imgTime);
		document.onmouseup=null;
		tag=img=tagImg=closeTag=null;
	}
	function moveStop(){
		document.onmousemove=null;
		tagImg.onmousemove=barHidden;
		img.style.cursor="pointer";
	}
}
//事件绑定部分
if(document.getElementById("workDemo")){
	var workTag=document.getElementById("workDemo");
	var workImg=workTag.getElementsByTagName("img"); //注册此处会把 workDemo下的所有img选中，包括子集下的子集。
	var worka=workTag.getElementsByTagName("a");
	for(var i=0; i<workImg.length; i++){workImg[i].onclick=ImgShow;worka[i].href="##"}
}
</script>
</body>
</html>

所属频道：图片特效特效/更新时间：2012-11-16

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