简单JS代码压缩器

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我是靠谱客的博主震动缘分，最近开发中收集的这篇文章主要介绍简单JS代码压缩器，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

1、

复制代码代码如下:

<!-- 
  - 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、

复制代码代码如下:

<HTML><HEAD><TITLE>Format</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(i<word_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(i<word_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(i<word_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(i<word_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.length>0){         
           var cc = new Array();             
           for(var i=index;i<index+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;i<word.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;i<val.length;i++){ 
           if(this._wordDelimiters.indexOf(val.charAt(i))>=0){ 
               count++; 
           } 
       } 
       if(count>0){ 
           count=count-1; 
       } 
       return count; 
   } 

   this.getIdent=function(){ 
       var n = []; 
       for(var i=0;i<this._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;i<10;i++){document.title=i;}}}; 

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

var a = new xx(100,"hello"),b=new xx(0,"ttyp"); 
if(1>2)  {   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=go><br> 
<textarea id=display rows=12 cols=100> 
</textarea> 
</BODY></HTML> 