代码简介：
仿淘宝网的商品图片预览效果，点击小缩略图会生成预览大图，这里的生成是指调用，当鼠标放到小图上时激活脚本，开始加载大图，一方面减少网页带宽，另一方面可以方便用户浏览图片，提高用户操作舒适度，总体感觉效果不错，几乎和淘宝网的一一模一样。
代码内容：
View Code
<!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>
<title>JS+CSS仿淘宝滑过小图预览大图代码 - www.webdm.cn</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<style type="text/css">
div#PreviewBox{
position:absolute;
padding-left:6px;
display: none;
Z-INDEX:2006;
}
div#PreviewBox span{
width:7px;
height:13px;
position:absolute;
left:0px;
top:9px;
background:url() 0 0 no-repeat;
}
div#PreviewBox div.Picture{
float:left;
border:1px #666 solid;
background:#FFF;
}
div#PreviewBox div.Picture div{
border:4px #e8e8e8 solid;
}
div#PreviewBox div.Picture div a img{
margin:19px;
border:1px #b6b6b6 solid;
display: block;
max-height: 250px;
max-width: 250px;
}
</style>
</head>
<body>
<script language="javascript" type="text/javascript">
var maxWidth=250;
var maxHeight=250;
function getPosXY(a,offset) {
var p=offset?offset.slice(0):[0,0],tn;
while(a) {
tn=a.tagName.toUpperCase();
if(tn=='IMG') {
a=a.offsetParent;continue;
}
p[0]+=a.offsetLeft-(tn=="DIV"&&a.scrollLeft?a.scrollLeft:0);
p[1]+=a.offsetTop-(tn=="DIV"&&a.scrollTop?a.scrollTop:0);
if(tn=="BODY")
break;
a=a.offsetParent;
}
return p;
}
function checkComplete() {
if(checkComplete.__img&&checkComplete.__img.complete)
checkComplete.__onload();
}
checkComplete.__onload=function() {
clearInterval(checkComplete.__timeId);
//More:www.webdm.cn
var w=checkComplete.__img.width;
var h=checkComplete.__img.height;
if(w>=h&&w>maxWidth) {
previewImage.style.width=maxWidth+'px';
}
else if(h>=w&&h>maxHeight) {
previewImage.style.height=maxHeight+'px';
}
else {
previewImage.style.width=previewImage.style.height='';
}
previewImage.src=checkComplete.__img.src;previewUrl.href=checkComplete.href;checkComplete.__img=null;
}
function showPreview(e) {
hidePreview (e);
previewFrom=e.target||e.srcElement;
previewImage.src=loadingImg;//More:www.webdm.cn
previewImage.style.width=previewImage.style.height='';
previewTimeoutId=setTimeout('_showPreview()',500);
checkComplete.__img=null;
}
function hidePreview(e) {
if(e) {
var toElement=e.relatedTarget||e.toElement;
while(toElement) {
if(toElement.id=='PreviewBox')
return;
toElement=toElement.parentNode;
}
}
try {
clearInterval(checkComplete.__timeId);
checkComplete.__img=null;
previewImage.src=null;
}
catch(e) {}
clearTimeout(previewTimeoutId);
previewBox.style.display='none';
}
function _showPreview() {
checkComplete.__img=new Image();
if(previewFrom.tagName.toUpperCase()=='A')
previewFrom=previewFrom.getElementsByTagName('img')[0];
var largeSrc=previewFrom.getAttribute("large-src");
var picLink=previewFrom.getAttribute("pic-link");
if(!largeSrc)
return;
else {
checkComplete.__img.src=largeSrc;
checkComplete.href=picLink;
checkComplete.__timeId=setInterval("checkComplete()",20);
var pos=getPosXY(previewFrom,[106,26]);
previewBox.style.left=pos[0]+'px';
previewBox.style.top=pos[1]+'px';
previewBox.style.display='block';
}
}
</script>
<div id="PreviewBox" onmouseout="hidePreview(event);">
<div class="Picture" onmouseout="hidePreview(event);">
<span></span>
<div>
<a id="previewUrl" href="javascript:void(0)" target="_blank"><img oncontextmenu="return(false)" id="PreviewImage" src="about:blank" border="0"
onmouseout="hidePreview(event);" /></a>
</div>
</div>
</div>
<script language="javascript" type="text/javascript">
var previewBox = document.getElementById('PreviewBox');
var previewImage = document.getElementById('PreviewImage');
var previewUrl = document.getElementById('previewUrl');
var previewFrom = null;
var previewTimeoutId = null;
var loadingImg = 'http://www.webdm.cn/images/loading.gif';
</script>
<a href="####" onmouseover='showPreview(event);' onmouseout='hidePreview(event);'>
<img src="http://www.webdm.cn/images/wall1_s.jpg" alt="" large-src="http://www.webdm.cn/images/wall1.jpg" pic-link="/" border="0" width="100"/></a>
</body>
</html>
<br />
<p><a href="http://www.webdm.cn">网页代码站</a> - 最专业的网页代码下载网站 - 致力为中国站长提供有质量的网页代码！</p>
代码来自：http://www.webdm.cn/webcode/0fa4ca7c-1750-46d8-9d74-70fed803b7b0.html
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>JS+CSS仿淘宝滑过小图预览大图代码 - www.webdm.cn</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<style type="text/css">
div#PreviewBox{
position:absolute;
padding-left:6px;
display: none;
Z-INDEX:2006;
}
div#PreviewBox span{
width:7px;
height:13px;
position:absolute;
left:0px;
top:9px;
background:url() 0 0 no-repeat;
}
div#PreviewBox div.Picture{
float:left;
border:1px #666 solid;
background:#FFF;
}
div#PreviewBox div.Picture div{
border:4px #e8e8e8 solid;
}
div#PreviewBox div.Picture div a img{
margin:19px;
border:1px #b6b6b6 solid;
display: block;
max-height: 250px;
max-width: 250px;
}
</style>
</head>
<body>
<script language="javascript" type="text/javascript">
var maxWidth=250;
var maxHeight=250;
function getPosXY(a,offset) {
var p=offset?offset.slice(0):[0,0],tn;
while(a) {
tn=a.tagName.toUpperCase();
if(tn=='IMG') {
a=a.offsetParent;continue;
}
p[0]+=a.offsetLeft-(tn=="DIV"&&a.scrollLeft?a.scrollLeft:0);
p[1]+=a.offsetTop-(tn=="DIV"&&a.scrollTop?a.scrollTop:0);
if(tn=="BODY")
break;
a=a.offsetParent;
}
return p;
}
function checkComplete() {
if(checkComplete.__img&&checkComplete.__img.complete)
checkComplete.__onload();
}
checkComplete.__onload=function() {
clearInterval(checkComplete.__timeId);
//More:www.webdm.cn
var w=checkComplete.__img.width;
var h=checkComplete.__img.height;
if(w>=h&&w>maxWidth) {
previewImage.style.width=maxWidth+'px';
}
else if(h>=w&&h>maxHeight) {
previewImage.style.height=maxHeight+'px';
}
else {
previewImage.style.width=previewImage.style.height='';
}
previewImage.src=checkComplete.__img.src;previewUrl.href=checkComplete.href;checkComplete.__img=null;
}
function showPreview(e) {
hidePreview (e);
previewFrom=e.target||e.srcElement;
previewImage.src=loadingImg;//More:www.webdm.cn
previewImage.style.width=previewImage.style.height='';
previewTimeoutId=setTimeout('_showPreview()',500);
checkComplete.__img=null;
}
function hidePreview(e) {
if(e) {
var toElement=e.relatedTarget||e.toElement;
while(toElement) {
if(toElement.id=='PreviewBox')
return;
toElement=toElement.parentNode;
}
}
try {
clearInterval(checkComplete.__timeId);
checkComplete.__img=null;
previewImage.src=null;
}
catch(e) {}
clearTimeout(previewTimeoutId);
previewBox.style.display='none';
}
function _showPreview() {
checkComplete.__img=new Image();
if(previewFrom.tagName.toUpperCase()=='A')
previewFrom=previewFrom.getElementsByTagName('img')[0];
var largeSrc=previewFrom.getAttribute("large-src");
var picLink=previewFrom.getAttribute("pic-link");
if(!largeSrc)
return;
else {
checkComplete.__img.src=largeSrc;
checkComplete.href=picLink;
checkComplete.__timeId=setInterval("checkComplete()",20);
var pos=getPosXY(previewFrom,[106,26]);
previewBox.style.left=pos[0]+'px';
previewBox.style.top=pos[1]+'px';
previewBox.style.display='block';
}
}
</script>
<div id="PreviewBox" onmouseout="hidePreview(event);">
<div class="Picture" onmouseout="hidePreview(event);">
<span></span>
<div>
<a id="previewUrl" href="javascript:void(0)" target="_blank"><img oncontextmenu="return(false)" id="PreviewImage" src="about:blank" border="0"
onmouseout="hidePreview(event);" /></a>
</div>
</div>
</div>
<script language="javascript" type="text/javascript">
var previewBox = document.getElementById('PreviewBox');
var previewImage = document.getElementById('PreviewImage');
var previewUrl = document.getElementById('previewUrl');
var previewFrom = null;
var previewTimeoutId = null;
var loadingImg = 'http://www.webdm.cn/images/loading.gif';
</script>
<a href="####" onmouseover='showPreview(event);' onmouseout='hidePreview(event);'>
<img src="http://www.webdm.cn/images/wall1_s.jpg" alt="" large-src="http://www.webdm.cn/images/wall1.jpg" pic-link="/" border="0" width="100"/></a>
</body>
</html>
<br />
<p><a href="http://www.webdm.cn">网页代码站</a> - 最专业的网页代码下载网站 - 致力为中国站长提供有质量的网页代码！</p>
代码来自：http://www.webdm.cn/webcode/0fa4ca7c-1750-46d8-9d74-70fed803b7b0.html