<!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>Js实现CSS代码高亮显示_www.jb200.com</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">检测看看效果咯</button>
<div id="pre" style="color:#F0F;"></div>
<script type="text/
javascript">
function $(id) {
return document.getElementById(id);
};
$("btn").onclick=function(){
var code=$("area").value;
//处理注释：注释替换成 _数字_
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)+"_");
}
//字符串
code=code.replace(/(['"]).*1/g,function(m){return "<span style="color:#060;">"+m+"</span>"});
//
css样式值
code=code.replace(/:(.+);/g,function(m,n){return ":<span style="color:#00F;">"+n+"</span>;"});
//CSS样式名称
code=code.replace(/[{}]/g,function(m){
if(m=="{"){
return "{<span style="color:#006;">";
}else{
return "</span>}";
}
});
//注释
code=code.replace(/_(d+)_/g,function(m,n){return "<span style="color:#999;">"+commentList[n]+"</span>"});
//处理t
code=code.replace(/^(t+)/gm,function(m){
return (new Array(m.length+1)).join(" ");
});
//处理空格
code=code.replace(/^( +)/gm, function(m) {
return (new Array(m.length + 1)).join(" ");
});
//处理换行
code=code.replace(/r?n/g,"<br>");
$("pre").innerHTML=code;
}
</script>
</body>
</html>
