js+css实现点小图动态遮罩弹出大图特效

　　这是使用JavaScript与CSS共同实现的点小图弹大图效果代码，采用了比较流行的遮罩层效果，当点击小图后，动态弹出大图，同时实现了点击关闭功能，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> <meta http-equiv="content-type" content="text/html; charset=gbk" /> <title>小图动态弹大图可关闭适应窗口大小　-　Liehuo.Net</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://www.veryhuo.com/uploads/common/images/liehuo_net_600x400_7.jpg" />把浏览器窗口放小后点击</a> <a href="#"><img src="http://www.veryhuo.com/uploads/common/images/liehuo_net_600x400_3.jpg" />把浏览器窗口放小后点击</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://www.veryhuo.com/uploads/common/images/loading.gif' /> Image loading... </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=" 关闭 "; 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> <center>如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.veryhuo.com/' target='_blank'>http://www.veryhuo.com/</a></center>
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