东西虽然有点过时，但是htc代码写的还是比较漂亮的。 原文地址：http://peterned.home.xs4all.nl/csshover.html
首先是脚本代码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 | <public:attach event="ondocumentready" onevent="CSSHover()"><script>/** * Whatever:hover - V3.11 * ------------------------------------------------------------ * Author - Peter Nederlof, http://www.xs4all.nl/~peterned * License - http://creativecommons.org/licenses/LGPL/2.1 * * Special thanks to Sergiu Dumitriu, http://purl.org/net/sergiu, * for fixing the expression loop. * * Whatever:hover is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Whatever:hover is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * howto: body { behavior:url("csshover3.htc"); } * ------------------------------------------------------------ */ window.CSSHover = (function(){ // regular expressions, used and explained later on. var REG_INTERACTIVE = /(^|\s)((([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active|focus))/i; var REG_AFFECTED = /(.*?)\:(hover|active|focus)/i; var REG_PSEUDO = /[^:]+:([a-z\-]+).*/i; var REG_SELECT = /(\.([a-z0-9_\-]+):[a-z]+)|(:[a-z]+)/gi; var REG_CLASS = /\.([a-z0-9_\-]*on(hover|active|focus))/i; var REG_MSIE = /msie (5|6|7)/i; var REG_COMPAT = /backcompat/i; // property mapping, real css properties must be used in order to clear expressions later on... // Uses obscure css properties that no-one is likely to use. The properties are borrowed to // set an expression, and are then restored to the most likely correct value. var Properties = { index: 0, list: ['text-kashida', 'text-kashida-space', 'text-justify'], get: function() { return this.list[(this.index++)%this.list.length]; } }; // camelize is used to convert css properties from (eg) text-kashida to textKashida var camelize = function(str) { return str.replace(/-(.)/mg, function(result, match){ return match.toUpperCase(); }); }; /** * Local CSSHover object * -------------------------- */ var CSSHover = { // array of CSSHoverElements, used to unload created events elements: [], // buffer used for checking on duplicate expressions callbacks: {}, // init, called once ondomcontentready via the exposed window.CSSHover function init:function() { // don't run in IE8 standards; expressions don't work in standards mode anyway, // and the stuff we're trying to fix should already work properly if(!REG_MSIE.test(navigator.userAgent) && !REG_COMPAT.test(window.document.compatMode)) { return; } // start parsing the existing stylesheets var sheets = window.document.styleSheets, l = sheets.length; for(var i=0; i<l; i++) { this.parseStylesheet(sheets[i]); } }, // called from init, parses individual stylesheets parseStylesheet:function(sheet) { // check sheet imports and parse those recursively if(sheet.imports) { try { var imports = sheet.imports; var l = imports.length; for(var i=0; i<l; i++) { this.parseStylesheet(sheet.imports[i]); } } catch(securityException){ // trycatch for various possible errors } } // interate the sheet's rules and send them to the parser try { var rules = sheet.rules; var r = rules.length; for(var j=0; j<r; j++) { this.parseCSSRule(rules[j], sheet); } } catch(someException){ // trycatch for various errors, most likely accessing the sheet's rules. } }, // magic starts here ... parseCSSRule:function(rule, sheet) { // The sheet is used to insert new rules into, this must be the same sheet the rule // came from, to ensure that relative paths keep pointing to the right location. // only parse a rule if it contains an interactive pseudo. var select = rule.selectorText; if(REG_INTERACTIVE.test(select)) { var style = rule.style.cssText; // affected elements are found by truncating the selector after the interactive pseudo, // eg: "div li:hover" >> "div li" var affected = REG_AFFECTED.exec(select)[1]; // that pseudo is needed for a classname, and defines the type of interaction (focus, hover, active) // eg: "li:hover" >> "onhover" var pseudo = select.replace(REG_PSEUDO, 'on$1'); // the new selector is going to use that classname in a new css rule, // since IE6 doesn't support multiple classnames, this is merged into one classname // eg: "li:hover" >> "li.onhover", "li.folder:hover" >> "li.folderonhover" var newSelect = select.replace(REG_SELECT, '.$2' + pseudo); // the classname is needed for the events that are going to be set on affected nodes // eg: "li.folder:hover" >> "folderonhover" var className = REG_CLASS.exec(newSelect)[1]; // no need to set the same callback more than once when the same selector uses the same classname var hash = affected + className; if(!this.callbacks[hash]) { // affected elements are given an expression under a borrowed css property, because fake properties // can't have their expressions cleared. Different properties are used per pseudo, to avoid // expressions from overwriting eachother. The expression does a callback to CSSHover.patch, // rerouted via the exposed window.CSSHover function. var property = Properties.get(); var atRuntime = camelize(property); // because the expression is added to the stylesheet, and styles are always applied to html that is // dynamically added to the dom, the expression will also trigger for those new elements (provided // they are selected by the affected selector). sheet.addRule(affected, property + ':expression(CSSHover(this, "'+pseudo+'", "'+className+'", "'+atRuntime+'"))'); // hash it, so an identical selector/class combo does not duplicate the expression this.callbacks[hash] = true; } // duplicate expressions need not be set, but the style could differ sheet.addRule(newSelect, style); } }, // called via the expression, patches individual nodes patch:function(node, type, className, property) { // restores the borrowed css property to the value of its immediate parent, clearing // the expression so that it's not repeatedly called. try { var value = node.parentNode.currentStyle[property]; node.style[property] = value; } catch(e) { // the above reset should never fail, but just in case, clear the runtimeStyle if it does. // this will also stop the expression. node.runtimeStyle[property] = ''; } // just to make sure, also keep track of patched classnames locally on the node if(!node.csshover) { node.csshover = []; } // and check for it to prevent duplicate events with the same classname from being set if(!node.csshover[className]) { node.csshover[className] = true; // create an instance for the given type and class var element = new CSSHoverElement(node, type, className); // and store that instance for unloading later on this.elements.push(element); } // returns a dummy value to the expression return type; }, // unload stuff onbeforeunload unload:function() { try { // remove events var l = this.elements.length; for(var i=0; i<l; i++) { this.elements[i].unload(); } // and set properties to null this.elements = []; this.callbacks = {}; } catch (e) { } } }; /** * CSSHoverElement * -------------------------- */ // the event types associated with the interactive pseudos var CSSEvents = { onhover: { activator: 'onmouseenter', deactivator: 'onmouseleave' }, onactive: { activator: 'onmousedown', deactivator: 'onmouseup' }, onfocus: { activator: 'onfocus', deactivator: 'onblur' } }; // CSSHoverElement constructor, called via CSSHover.patch function CSSHoverElement(node, type, className) { // the CSSHoverElement patches individual nodes by manually applying the events that should // have fired by the css pseudoclasses, eg mouseenter and mouseleave for :hover. this.node = node; this.type = type; var replacer = new RegExp('(^|\\s)'+className+'(\\s|$)', 'g'); // store event handlers for removal onunload this.activator = function(){ node.className += ' ' + className; }; this.deactivator = function(){ node.className = node.className.replace(replacer, ' '); }; // add the events node.attachEvent(CSSEvents[type].activator, this.activator); node.attachEvent(CSSEvents[type].deactivator, this.deactivator); } CSSHoverElement.prototype = { // onbeforeunload, called via CSSHover.unload unload:function() { // remove events this.node.detachEvent(CSSEvents[this.type].activator, this.activator); this.node.detachEvent(CSSEvents[this.type].deactivator, this.deactivator); // and set properties to null this.activator = null; this.deactivator = null; this.node = null; this.type = null; } }; // add the unload to the onbeforeunload event window.attachEvent('onbeforeunload', function(){ CSSHover.unload(); }); /** * Public hook * -------------------------- */ return function(node, type, className, property) { if(node) { // called via the css expression; patches individual nodes return CSSHover.patch(node, type, className, property); } else { // called ondomcontentready via the public:attach node CSSHover.init(); } }; })();</script></public:attach> |
使用方法很简单，在body的css中添加一行：
1 2 3 | body { behavior: url("csshover3.htc"); } |