csshover.htc 以及简单使用方法（解决IE6下 :hover 在其他标签下无效问题）
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注：传说LINUX操作系统不支持 .htc文件
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以下为csshover.htc 内容
<attach event="ondocumentready" handler="parseStylesheets" />
<script language="JScript">
/**
* Pseudos - V1.30.050121 - hover & active
* ---------------------------------------------
* Peterned - http://www.xs4all.nl/~peterned/
* (c) 2005 - Peter Nederlof
*
* Credits - Arnoud Berendsen
* - Martin Reurings
* - Robert Hanson
*
* howto: body { behavior:url("csshover.htc"); }
* ---------------------------------------------
*/
var currentSheet, doc = window.document, activators = {
onhover:{on:'onmouseover', off:'onmouseout'},
onactive:{on:'onmousedown', off:'onmouseup'}
}
function parseStylesheets() {
//window.alert("hi");
var sheets = doc.styleSheets, l = sheets.length;
for(var i=0; i<l; i++)
parseStylesheet(sheets[i]);
}
function parseStylesheet(sheet) {
if(sheet.imports) {
try {
var imports = sheet.imports, l = imports.length;
for(var i=0; i<l; i++) parseStylesheet(sheet.imports[i]);
} catch(securityException){}
}
try {
var rules = (currentSheet = sheet).rules, l = rules.length;
for(var j=0; j<l; j++) parseCSSRule(rules[j]);
} catch(securityException){}
}
function parseCSSRule(rule) {
var select = rule.selectorText, style = rule.style.cssText;
if(!(/(^|\s)(([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active)/i).test(select) || !style) return;
var pseudo = select.replace(/[^:]+:([a-z-]+).*/i, 'on$1');
var newSelect = select.replace(/(\.([a-z0-9_-]+):[a-z]+)|(:[a-z]+)/gi, '.$2' + pseudo);
var className = (/\.([a-z0-9_-]*on(hover|active))/i).exec(newSelect)[1];
var affected = select.replace(/:hover.*$/, '');
var elements = getElementsBySelect(affected);
currentSheet.addRule(newSelect, style);
for(var i=0; i<elements.length; i++)
new HoverElement(elements[i], className, activators[pseudo]);
}
function HoverElement(node, className, events) {
if(!node.hovers) node.hovers = {};
if(node.hovers[className]) return;
node.hovers[className] = true;
node.attachEvent(events.on,
function() { node.className += ' ' + className; });
node.attachEvent(events.off,
function() { node.className =
node.className.replace(new RegExp('\\s+'+className, 'g'),''); });
}
function getElementsBySelect(rule) {
var parts, nodes = [doc];
parts = rule.split(' ');
for(var i=0; i<parts.length; i++) {
nodes = getSelectedNodes(parts[i], nodes);
} return nodes;
}
function getSelectedNodes(select, elements) {
var result, node, nodes = [];
var classname = (/\.([a-z0-9_-]+)/i).exec(select);
var identify = (/\#([a-z0-9_-]+)/i).exec(select);
var tagName = select.replace(/(\.|\#|\:)[a-z0-9_-]+/i, '');
for(var i=0; i<elements.length; i++) {
result = tagName? elements[i].all.tags(tagName):elements[i].all;
for(var j=0; j<result.length; j++) {
node = result[j];
if((identify && node.id != identify[1]) || (classname && !(new RegExp('\\b' +
classname[1] + '\\b').exec(node.className)))) continue;
nodes[nodes.length] = node;
}
} return nodes;
}
</script>
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使用方法
<style type="text/css">
body { behavior: url(csshover.htc); } /*注意路径*/
</style>
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下面一个小例子，实现 li:hover 在IE6下有效。 测试平台 IETester IE6
<!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>无标题文档</title>
<style type="text/css">
body{ behavior:url("style/csshover.htc");}
ul,li{list-style:none; margin:0; padding:0;}
ul li{width:80px; height:30px; line-height:30px;}
ul li ul {display:none; padding-left:10px;}
ul li:hover ul {display:block;}
</style>
</head>
<body>
<div>
<ul>
<li><a href="#">一级菜单</a>
<ul>
<li><a href="#">二级菜单</a></li>
</ul>
</li>
</ul>
</div>
</body>
</html>
