【javascript】csshover解决ie6下hover兼容问题
<div id="cnblogs_post_body">在 ie6 下只有 a 才支持 :hover 伪类，其它标签都不支持，很是让人头疼。不过，可以通过 csshover.htc 可以解决 ie6 的 hover 兼容问题。它利用 javascript 脚本来给元素的的样式定义，如果检测到 hover 定义，就给元素设置 onmouseover 和 onmouseout 事件，以此来实现 hover 的效果。
附上 csshover.htc 代码：
<div class="cnblogs_code"><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(){ var sheets = doc.styleSheets, l = sheets.length; for(var i = 0; i < l; i++){ parseStylesheet(sheets); };};function parseStylesheet(sheet){ if(sheet.imports){ try{ var imports = sheet.imports, l = imports.length; for(var i = 0; i < l; i++){ parseStylesheet(sheet.imports); }; }catch(securityException){}; }; try{ var rules = (currentSheet = sheet).rules, l = rules.length; for(var j = 0; j < l; j++){ parseCSSRule(rules); }; }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(/[^:]+:(+).*/i, 'on$1'); var newSelect = select.replace(/(\.(+):+)|(:+)/gi, '.$2' + pseudo); var className = (/\.(*on(hover|active))/i).exec(newSelect)]; var affected = select.replace(/:hover.*$/, ''); var elements = getElementsBySelect(affected); currentSheet.addRule(newSelect, style); for(var i = 0; i < elements.length; i++){ new HoverElement(elements, className, activators); };};function HoverElement(node, className, events){ if(!node.hovers) node.hovers = {}; if(node.hovers) return; node.hovers = 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 = ; parts = rule.split(' '); for(var i = 0; i < parts.length; i++){ nodes = getSelectedNodes(parts, nodes); }; return nodes;};function getSelectedNodes(select, elements){ var result, node, nodes = []; var classname = (/\.(+)/i).exec(select); var identify = (/\#(+)/i).exec(select); var tagName = select.replace(/(\.|\#|\:)+/i, ''); for(var i = 0; i < elements.length; i++){ result = tagName ? elements.all.tags(tagName) : elements.all; for(var j = 0; j < result.length; j++){ node = result; if((identify && node.id != identify) || (classname && !(new RegExp('\\b' + classname + '\\b').exec(node.className)))) continue; nodes = node; }; }; return nodes;};</script>
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