• JS代码的格式化和压缩

    <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：ttyp@21cn.com  
    **    日期：2007-7-8
    **    版本：0.5
    **    ==================================================================================================  
    *    */  

    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,do,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,while");

            this._beginBlock    = "{";
            this._endBlock      = "}";
        
            this._singleEyeElement = this.str2hashtable("var,new,return,else,delete,case,typeof");
            //得到分割字符
        this._wordDelimiters= "　 ,.?!;:\\/<>(){}[]\"'\r\n\t=+-|*%@#$^&";
        //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._doubleEyeElement   = this.str2hashtable("in,instanceof");


            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]     = "\r\n"+ 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--;
                        htmlTxt[htmlTxt.length]     = "\n" + this.getIdent() + codeArr[i];
                            if(this.isNextChar(i,codeArr)==false){
                            htmlTxt[htmlTxt.length]     = "\n";
                        }
                    }    else{
                            //压缩时处理下一个非空字母，不为;,)]}
                        if(i<word_index&&this.isNextChar(i,codeArr)==false){
                            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])){    
                    htmlTxt[htmlTxt.length]     = codeArr[i] + " ";
                    //处理内置对象(前后面加一个空格)
                } else if (!slash_slash_comment_opened&&!slash_star_comment_opened && !quote_opened && this.isDoubleEyeElement(codeArr[i])){    
                    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(!slash_star_comment_opened&&!slash_slash_comment_opened &&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.isDoubleEyeElement = function(val) {
                return this._doubleEyeElement.contains(this._caseSensitive?val:val.toLowerCase());
        }


            this.isNextElement = function(from,word){
                for(var i=from+1;i<word.length;i++){
                    if(word[i]!=" "&&word[i]!="\t"&&word[i]!="\r"&&word[i]!="\n"){                
                        return this.isChoiceElement(word[i]);
                }
            }
                return false;
        }

            this.isNextChar = function(from,word){
                for(var i=from+1;i<word.length;i++){
                    if(word[i]!=" "&&word[i]!="\t"&&word[i]!="\r"&&word[i]!="\n"){                
                        return ";,)]}".indexOf(word[i])>=0||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;}}//str=str.replace(/(\\)/gi,'\\\\'); 
    };

    var o     = {a:function(){},b:345}

    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>

    曾经为看别人写的杂乱代码而头痛吗?曾经为看BWindow代码而烦恼吗?曾经为减小JS体积和JS的可读性之间的矛盾而左右徘徊吗?最好的办法是有个代码格式化和代码压缩的程序,今天总算有了,它是纯JS编写的,当然也就是开源的了.不好意思,做个广告先:),老早就想写这个代码了,今天总算利用这个周末把它写完了,由于写的仓促,还有些小BUG,请经常注意更新!

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  • 原文地址：https://www.cnblogs.com/ttyp/p/406323.html
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