简单JS代码压缩器

【 tulaoshi.com - Web开发 】

1、
代码如下：

!--
  - From: a href="http://www.iecn.net/bbs/view/105499.html" target="_blank"http://www.iecn.net/bbs/view/105499.html/a
  - IECN.NET 2006-09-22
  --

script language="javascript" 

type="text/javascript"
//去除所有的注释
String.prototype.DeleteComment = function ()
{
    var str = this.replace(/(['"])(.+?)(['"])/g,function(s,s1,s2,s3){return s1+s2.replace(/[/*]/g,"$&")+s3});
    str = str.replace(///[^r]+|/*[sS]+?*//g,"");
    str = str.replace(/(['"])(.+?)(['"])/g,function(s,s1,s2,s3){return s1+s2.replace(/([^])/g,"$1")+s3});
    return str;
}
//格式代码
String.prototype.FormatCode = function ()
{
    return this.replace(/$/mg,"").replace(/[^s;]$/mg,"$&;");
}
//删除字符串前后多余的空格
String.prototype.Trim = function (m)
{
    return this.replace(m ? /^s*|s*$/mg : /^s*|s*$/g, "");
}
//运行代码
function RunCode(obj)
{
    window.open('','_blank').document.write(obj.value);
}

/script

测试代码：br/
textArea id="Text" rows="25" cols="80"
script language="JavaScript"
/*
    测试代码
*/
var x=5;
document.write("x = // " + x);
document.write("bh/* " + x);
document.write("x =jjhj */hhhhhh " + x);
document.write("x = // " + x);

alert(22)

alert(22)

var a="/fwe/////wefawef";
alert(/^/*[^/]*$/.test(a));
//注释
/script

/textArea br/br/
第1步：button onclick="Text.value = Text.value.DeleteComment();"删除注释/button br/ br/
第2步：button onclick="Text.value=Text.value.FormatCode();"格式代码/button br/ br/
第3步：button onclick="Text.value=Text.value.Trim(true);"去除两边空格/button br/ br/
第4步：button onclick="RunCode(Text);"运行代码/button br/ br/


2、
代码如下：
HTMLHEADTITLEFormat/TITLE
META content="MSHTML 6.00.2800.1528" name=GENERATOR
META content="" name=Author
META content="" name=Keywords
META content="" name=Description/HEAD
BODY
SCRIPT language=JavaScript
!--
/**//**//**//** 
**    ==================================================================================================  
**    类名：CLASS_FORMATER
**    功能：JS格式化  
**    示例：  
   ---------------------------------------------------------------------------------------------------  

           var xx        = new CLASS_FORMATER(code);            

           document.getElementById("display").innerHTML = xx.format(); 

   ---------------------------------------------------------------------------------------------------  
**    作者：ttyp  
**    邮件：a href="mailto:ttyp@21cn.com"ttyp@21cn.com/a  
**    日期：2006-5-21  
**    版本：0.1
**    ==================================================================================================  
**/  

function CLASS_FORMAT(code){
   //哈希表类
   function Hashtable(){
       this._hash        = new Object();
       this.add        = function(key,value){
                           if(typeof(key)!="undefined"){
                               if(this.contains(key)==false){
                                   this._hash[key]=typeof(value)=="undefined"?null:value;
                                   return true;
                               } else {
                                   return false;
                               }
                           } else {
                               return false;
                           }
                       }
       this.remove        = function(key){delete this._hash[key];}
       this.count        = function(){var i=0;for(var k in this._hash){i++;} return i;}
       this.items        = function(key){return this._hash[key];}
       this.contains    = function(key){return typeof(this._hash[key])!="undefined";}
       this.clear        = function(){for(var k in this._hash){delete this._hash[k];}}

   }

   this._caseSensitive = true;

   //字符串转换为哈希表
   this.str2hashtable = function(key,cs){

       var _key    = key.split(/,/g);
       var _hash    = new Hashtable(); 
       var _cs        = true;

   
       if(typeof(cs)=="undefined"||cs==null){
           _cs = this._caseSensitive;
       } else {
           _cs = cs;
       }

       for(var i in _key){
           if(_cs){
               _hash.add(_key[i]);
           } else {
               _hash.add((_key[i]+"").toLowerCase());
           }

       }
       return _hash;
   }

   //获得需要转换的代码
   this._codetxt        = code;

   if(typeof(syntax)=="undefined"){
       syntax = "";
   }

   this._deleteComment = false;
   //是否大小写敏感
   this._caseSensitive = true;
   //可以后面加块语句的关键字
   this._blockElement  = this.str2hashtable("switch,if,while,try,finally");
   //是函数申明
   this._function      = this.str2hashtable("function");
   //本行括号内分号不做换行
   this._isFor            = "for";

   this._choiceElement = this.str2hashtable("else,catch");

   this._beginBlock    = "{";
   this._endBlock      = "}";

   this._singleEyeElement = this.str2hashtable("var,new,return,else,delete,in,case");
   //得到分割字符
   this._wordDelimiters= "　 ,.?!;:/(){}[]"'rnt=+-|*%@#$^&";
   //引用字符
   this._quotation     = this.str2hashtable("",'");
   //行注释字符
   this._lineComment   = "//";
   //转义字符
   this._escape        = "";
   //多行引用开始
   this._commentOn        = "/*";
   //多行引用结束
   this._commentOff    = "*/";
   //行结束词
   this._rowEnd        = ";";

   this._in            = "in";


   this.isCompress        = false;
   this.style            = 0;

   this._tabNum        = 0;


   this.format = function() {
       var codeArr        = new Array();
       var word_index    = 0;
       var htmlTxt        = new Array();

       if(this.isCompress){
           this._deleteComment = true;
       }


       //得到分割字符数组(分词)
       for (var i = 0; i  this._codetxt.length; i++) {       
           if (this._wordDelimiters.indexOf(this._codetxt.charAt(i)) == -1) {        //找不到关键字
               if (codeArr[word_index] == null || typeof(codeArr[word_index]) == 'undefined') {
                   codeArr[word_index] = "";
               }
               codeArr[word_index] += this._codetxt.charAt(i);
           } else {
               if (typeof(codeArr[word_index]) != 'undefined' && codeArr[word_index].length  0)
                   word_index++;
               codeArr[word_index++] = this._codetxt.charAt(i);                
           } 
       }


       var quote_opened                = false;    //引用标记
       var slash_star_comment_opened   = false;    //多行注释标记
       var slash_slash_comment_opened  = false;    //单行注释标记
       var line_num                    = 1;        //行号
       var quote_char                  = "";       //引用标记类型

       var function_opened             = false;

       var bracket_open                = false;
       var for_open                    = false;

       //按分割字，分块显示
       for (var i=0; i =word_index; i++){            
           //处理空行（由于转义带来）
           if(typeof(codeArr[i])=="undefined"||codeArr[i].length==0){
               continue;
           } else if(codeArr[i]==" "||codeArr[i]=="t"){
               if(slash_slash_comment_opened||slash_star_comment_opened){
                   if(!this._deleteComment){
                       htmlTxt[htmlTxt.length] = codeArr[i];
                   }
               }
               if(quote_opened){
                       htmlTxt[htmlTxt.length] = codeArr[i];                    
               }
           } else if(codeArr[i]=="n"){
           //处理换行
           } else if (codeArr[i] == "r"){                                                                    
               slash_slash_comment_opened = false;    
               quote_opened    = false;
               line_num++;
               if(!this.isCompress){
                   htmlTxt[htmlTxt.length] = "rn"+ this.getIdent();    
               }
           //处理function里的参数标记
           } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&this.isFunction(codeArr[i])){
               htmlTxt[htmlTxt.length] = codeArr[i]  + " ";
               function_opened = true;
           } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._isFor){
               htmlTxt[htmlTxt.length] = codeArr[i];
               for_open = true;
           } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]=="("){
               bracket_open    = true;
               htmlTxt[htmlTxt.length] = codeArr[i];
           } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==")"){
               bracket_open    = false;
               htmlTxt[htmlTxt.length] = codeArr[i];
           } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._rowEnd){
               if(!this.isCompress){
                   if(!for_open){
                       if(iword_index&&(codeArr[i+1]!="r"&&codeArr[i+1]!="n")){                            
                           htmlTxt[htmlTxt.length] = codeArr[i] + "n" + this.getIdent();
                       }else{
                           htmlTxt[htmlTxt.length] = codeArr[i] + this.getIdent();
                       }
                   }else{
                       htmlTxt[htmlTxt.length] = codeArr[i];                    
                   }
               }else{
                   htmlTxt[htmlTxt.length] = codeArr[i];
               }
           } else if(!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._beginBlock){
               for_open    = false;
               if(!this.isCompress){
                   switch(this.style){
                       case 0:
                           this._tabNum++;
                           htmlTxt[htmlTxt.length] = codeArr[i] + "n" + this.getIdent();
                           break;
                       case 1:
                           htmlTxt[htmlTxt.length] = "n" + this.getIdent();
                           this._tabNum++;
                           htmlTxt[htmlTxt.length] = codeArr[i] + "n"+ this.getIdent();
                           break;
                       default:
                           this._tabNum++;
                           htmlTxt[htmlTxt.length] = codeArr[i];
                           break;

                   }
               }else{
                   htmlTxt[htmlTxt.length] = codeArr[i];
               }

           } else if(!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened &&codeArr[i]==this._endBlock){
               if(!this.isCompress){
                   this._tabNum--;
                   if(iword_index&&codeArr[i+1]!=this._rowEnd){
                       htmlTxt[htmlTxt.length] = "n" + this.getIdent() + codeArr[i];
                   }else{
                       htmlTxt[htmlTxt.length] = "n" + this.getIdent() + codeArr[i];
                   }
               }else{
                   if(iword_index&&codeArr[i+1]!=this._rowEnd){
                       htmlTxt[htmlTxt.length] = codeArr[i] + this._rowEnd;
                   }else{
                       htmlTxt[htmlTxt.length] = codeArr[i];
                   }
               }
           //处理关键字
           } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isBlockElement(codeArr[i])){     
               htmlTxt[htmlTxt.length] = codeArr[i];
           //处理内置对象(后面加一个空格)
           } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isSingleEyeElement(codeArr[i])){    
               if(codeArr[i]==this._in){
                   htmlTxt[htmlTxt.length] = " ";
               }
               htmlTxt[htmlTxt.length] = codeArr[i] + " ";
           //处理双引号（引号前不能为转义字符）    
           } else if (!slash_star_comment_opened&&!slash_slash_comment_opened&&this._quotation.contains(codeArr[i])){                                                    
               if (quote_opened){
                   //是相应的引号
                   if(quote_char==codeArr[i]){
                       htmlTxt[htmlTxt.length] = codeArr[i];                    
                       quote_opened    = false;
                       quote_char      = "";
                   } else {
                       htmlTxt[htmlTxt.length] = codeArr[i];            
                   }
               } else {
                   htmlTxt[htmlTxt.length] =  codeArr[i];
                   quote_opened    = true;
                   quote_char        = codeArr[i];
               }                    
           //处理转义字符
           } else if(codeArr[i] == this._escape){    
               htmlTxt[htmlTxt.length] = codeArr[i]; 
               if(iword_index-1){
                   if(codeArr[i+1].charCodeAt(0)=32&&codeArr[i+1].charCodeAt(0)=127){
                       htmlTxt[htmlTxt.length] = codeArr[i+1].substr(0,1);
                       htmlTxt[htmlTxt.length] = codeArr[i+1].substr(1);
                       i=i+1;
                   }
               }            
           //处理多行注释的开始
           } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._commentOn,codeArr,i)){                                             
               slash_star_comment_opened = true;
               if(!this._deleteComment){
                   htmlTxt[htmlTxt.length] = this._commentOn;
               }
               i = i + this.getSkipLength(this._commentOn);    
           //处理单行注释
           } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._lineComment,codeArr,i)){                                                
               slash_slash_comment_opened = true;
               if(!this._deleteComment){
                   htmlTxt[htmlTxt.length] =  this._lineComment;
               }
               i = i + this.getSkipLength(this._lineComment);    
           //处理忽略词
           } else if (!slash_slash_comment_opened && !slash_star_comment_opened&&!quote_opened&&this.isStartWith(this._ignore,codeArr,i)){                                                
               slash_slash_comment_opened = true;
               htmlTxt[htmlTxt.length] = this._ignore;
               i = i + this.getSkipLength(this._ignore);                    
           //处理多行注释结束    
           } else if (!quote_opened&&!slash_slash_comment_opened&&this.isStartWith(this._commentOff,codeArr,i)){                                
               if (slash_star_comment_opened) {
                   slash_star_comment_opened = false;
                   if(!this._deleteComment){
                       htmlTxt[htmlTxt.length] =  this._commentOff;
                   }
                   i = i + this.getSkipLength(this._commentOff);        
               }
           } else {
               //不是在字符串中
               if(!quote_opened){
                   //如果不是在注释重
                   if(!slash_slash_comment_opened && !slash_star_comment_opened){    
                           htmlTxt[htmlTxt.length] = codeArr[i];                        
                   //注释中                            
                   }else{
                       if(!this._deleteComment){
                           htmlTxt[htmlTxt.length] = codeArr[i];
                       }
                   }
               }else{
                           htmlTxt[htmlTxt.length] = codeArr[i];
               }
           }

       }

       return htmlTxt.join("");
   }

   this.isStartWith = function(str,code,index){

       if(typeof(str)!="undefined"&&str.length0){        
           var cc = new Array();            
           for(var i=index;iindex+str.length;i++){
               cc[cc.length] = code[i];
           }
           var c = cc.join("");
           if(this._caseSensitive){
               if(str.length=code[index].length&&c.indexOf(str)==0){
                   return true;
               }
           }else{
               if(str.length=code[index].length&&c.toLowerCase().indexOf(str.toLowerCase())==0){
                   return true;
               }
           }
           return false;

       } else {
           return false;
       }
   }

   this.isFunction = function(val){
       return this._function.contains(this._caseSensitive?val:val.toLowerCase());
   }

   this.isBlockElement = function(val) {        
       return this._blockElement.contains(this._caseSensitive?val:val.toLowerCase());
   }

   this.isChoiceElement = function(val) {        
       return this._choiceElement.contains(this._caseSensitive?val:val.toLowerCase());
   }

   this.isSingleEyeElement = function(val) {
       return this._singleEyeElement.contains(this._caseSensitive?val:val.toLowerCase());
   }

   this.isNextElement = function(from,word){
       for(var i=from;iword.length;i++){
           if(word[i]!=" "&&word[i]!="t"&&word[i]!="r"&&word[i]!="n"){                
               return this.isChoiceElement(word[i]);
           }
       }
       return false;
   }

   this.getSkipLength = function(val){    
       var count = 0;
       for(var i=0;ival.length;i++){
           if(this._wordDelimiters.indexOf(val.charAt(i))=0){
               count++;
           }
       }
       if(count0){
           count=count-1;
       }
       return count;
   }

   this.getIdent=function(){
       var n = [];
       for(var i=0;ithis._tabNum;i++){
           n[n.length] = "t";
       }
       return n.join("");
   }
}

function doformat(o){
   var htmltxt = "";

   if (o == null){
       alert("domNode is null!");
       return;
   }

   var _codetxt = "";

   if(typeof(o)=="object"){
       switch(o.tagName){
           case "TEXTAREA":
           case "INPUT":
               _codetxt = o.value;
               break;
           case "DIV":
           case "SPAN":
               _codetxt = o.innerText;
               break;
           default:
               _codetxt = o.innerHTML;
               break;
       }
   }else{
       _codetxt = o;
   }

   var _syn = new CLASS_FORMAT(_codetxt);
   htmltxt = _syn.format();
   return  htmltxt;
}


function go()
{
   var code    = document.getElementById("code").value;
   var xx      = new CLASS_FORMAT(code);    
   var a       = new Date();

   if(document.getElementById('cboOperate').selectedIndex==1){
       xx.isCompress=true;
   }else{
       xx.style = parseInt(document.getElementById('cboStyle').value);
   }
   document.getElementById("display").value = xx.format();
   alert("共花：" + (new Date().getTime()-a.getTime()) + "ms");
}
//--
/SCRIPT
TEXTAREA id=code rows=12 cols=100
/*
这个是一个类
*/


function    xx   (num,str){//说明
var a = num;this.aa = a;
this.bb = function(){alert(str);}
this.cc = function(){for(var i=0;i10;i++){document.title=i;}}};

xx.prototype.dd= function(){alert("d  d        kd");}

var a = new xx(100,"hello"),b=new xx(0,"ttyp");
if(12)  {   alert();
}
else {
alert(" hell ");
}

a.bb();
b.dd();
alert(a.aa);

/TEXTAREA BR
select id="cboOperate" onchange="if(this.selectedIndex==1)document.getElementById('cboStyle').disabled=true;else document.getElementById('cboStyle').disabled=false;"
   option value="0"格式化/option
   option value="1"压缩/option
/select
select id="cboStyle"
   option value="0"经典/option
   option value="1"微软/option
/select
INPUT onclick=go() type=button value=gobr
textarea id=display rows=12 cols=100
/textarea
/BODY/HTML