ie6中hover无效的解决方法

IE6只支持 a:hover ，标签 a 以外的hover在IE6下无效，解决办法如下：

在html页面（而不是css文件）中设置样式，

<style type="text/css">

body { behavior: url(css/hover.htc); }

< /style>

其中hover.htc文件的内容如下：

<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>