以下为csshover.htc 内容 <attach event="ondocumentready" handler="parseStylesheets" /> <script language="JScript"> 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> -------------------------------------- 使用方法 <style type="text/css"> body { behavior: url(csshover.htc); } </style> ---------------------------------- 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{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> 附：JQuery解决方法： function hoverFunc(select, css){ $(select).hover( function(){ $(this).addClass(css); }, function(){ $(this).removeClass(css); } ) } hoverFunc('#bt1', 't1_hover'); hoverFunc('.exp_1', 'exp_1_hover');