javascript深入之動態添加樣式規則

添加CSS的方式有行內式、嵌入式、外鏈式、匯入式a)動態引入樣式表檔案：function loadLink(url){var link = document.createElement("link");link.type = "text/css";link.rel  = "stylesheet";link.href  = url;var head = document.getElmentsByTagName("head")[0];head.appendChild(link);}b)嵌入式：function insertStyles(){var doc,cssCode=[],cssText;var len = arguments.length;var head,style,firstStyle;if(len == 1){doc = document;cssCode.push(arguments[0])}else if(len == 2){doc = arguments[0];cssCode.push(arguments[1]);}else{alert("函數最多接收兩個參數！");}head = doc.getElementsByTagName("head")[0];styles= head.getElementsByTagName("style");if(styles.length == 0){if(doc.createStyleSheet){//iedoc.createStyleSheet();}else{//FFvar tempStyle = doc.createElement("style");tempStyle.setAttibute("type","text/css");head.appendChild(tempStyle);}}firstStyle = styles[0];cssText=cssCode.join("\n");if(!+"\v1"){//opacity相容var str = cssText.match(/opacity:(\d?\.\d+);/); if(str!=null){cssText = cssText.replace(str[0],"filter:alpha(opacity="+pareFloat(str[1])*100+")");}}if(firstStyle.styleSheet){firstStyle.styleSheee.cssText += cssText;}else if(doc.getBoxObjectFor){firstStyle.innerHTML += cssText;}else{firstStyle.appendChild(doc.createTextNode(cssText));}}c)行內式：var addStyle=function (ele,str){var s = ele.getAttribute("style"),styles;if(str && typeof str === "string"){if(!s){ele.style.cssText = str;}else{if(s == '[object]'){//IE6/7 e.getAttribute("style")返回[object]s=ele.style.cssText;}styles= trim(s).split(";");for (var i=0,len=styles.length; i<len; i++){var style_i=trim(styles[i]);var attr=style_i.split(":")[0];if(str.indexOf(attr)>-1){styles[i]="";}else{styles[i]=style_i;}}ele.style.cssText= styles.join("")+";"+str;}}}d)匯入式：import "index.css";操作CSS 類相關的方法：var hasClass=function(ele,value){var rclass = /[\n\t\r]/g,value=" "+value+" ";return (ele.nodeType==1)&&(" "+ele.className+" ").replace(rclass," ").indexOf(value)>-1;}var trim=function (val){return val.replace(/(^\s+)|(\s+$)/g,"");}var addClass=function(ele,value){var rspace = /\s+/,classNames,getClass;if(value&&typeof value === "string"){classNames = value.split(rspace);if(ele.nodeType === 1){if(!ele.className && classNames.length == 1){ele.className = value;}else{getClass = " "+ele.className+" ";for(var i=0,len=classNames.length; i<len ;i++){var cname=classNames[i];if(!hasClass(ele,cname)){getClass += cname+" ";}}ele.className = trim(getClass);}}}}var removeClass=function(ele,value){var rclass = /[\n\t\r]/g,classNames,getClass;if((value&&typeof value === "string")||value === undefined){classNames = (value||"").split(rspace);if(ele.nodeType === 1 && ele.className){if(value){//存在尋找要移除的類getClass =  " "+ele.className+" ".replace(rclass," ");//左右空格，為了使類中各類間均等，方便後面替換for(var i=0,len=classNames.length; i<len; i++){getClass = getClass.replace(" "+classNames[i]+" "," ")}ele.className=trim(getClass);}else{//不存在移除所有類ele.className = "";}}}}var toggleClass=function(ele,value){if(typeof value === "string"){if(hasClass(ele,value)){removeClass(ele,value);}else{addClass(ele,value);}}}