相比JavaScript，CSS的文法就簡單多了，主要是處理注釋、字串、CSS樣式名稱、CSS樣式值、縮排和換行，具體詳情請看代碼。
<!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>Javascript實現CSS代碼高亮顯示 </title> <style type="text/css"> body{ font-size:12px; line-height:1.8; font-family:'Courier New', Courier, monospace; } #area{ width:320px; height:120px; } </style> </head> <body> <textarea id="area"> body{ font-size:12px; line-height:1.8; } #area{ width:320px; line-height:1.5; font-family:"Courier New", Courier, monospace; } /* ul{ margin:0; padding:0; } */ </textarea> <button id="btn">This'S Testing……</button> <div id="pre" ></div> <script type="text/javascript"> function $(id) { return document.getElementById(id); }; $("btn").onclick=function(){ var code=$("area").value; //處理注釋：注釋替換成 _數字_ var startIdx=endIndex=-1; var at=0; var commentList=[]; while(true){ startIndex=code.indexOf("/*",at); if(startIndex==-1)break; endIndex=code.indexOf("*/",startIndex); if(endIndex==-1)break; at=endIndex+2; commentList.push(code.substring(startIndex,at)); code=code.replace(commentList[commentList.length-1],"_"+(commentList.length-1)+"_"); } //字串 code=code.replace(/(['"]).*\1/g,function(m){return "<span style=\"color:#060;\">"+m+"</span>"}); //CSS樣式值 code=code.replace(/:(.+);/g,function(m,n){return ":<span style=\"color:#00F;\">"+n+"</span>;"}); //CSS樣式名稱 code=code.replace(/[{}]/g,function(m){ if(m=="{"){ return "{<span style=\"color:#006;\">"; }else{ return "</span>}"; } }); //注釋 code=code.replace(/_(\d+)_/g,function(m,n){return "<span style=\"color:#999;\">"+commentList[n]+"</span>"}); //處理\t code=code.replace(/^(\t+)/gm,function(m){ return (new Array(m.length+1)).join(" "); }); //處理空格 code=code.replace(/^( +)/gm, function(m) { return (new Array(m.length + 1)).join(" "); }); //處理換行 code=code.replace(/\r?\n/g,"<br>"); $("pre").innerHTML=code; } </script> </body> </html>
[Ctrl+A 全選 注:如需引入外部Js需重新整理才能執行]
