听起来很拗口的样子
但是把以下代码保存为html格式，然后在打开之，把要格式化的代码赋复制到上面的栏中，点击GO即可
<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：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= " ,.?!;://<>(){}[]"' =+-|*%@#$^&";
//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]==" ")...{
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]==" ")...{
//处理换行
} else if (codeArr[i] == " ")...{
slash_slash_comment_opened = false;
quote_opened = false;
line_num++;
if(!this.isCompress)...{
htmlTxt[htmlTxt.length] = " "+ 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]!=" "&&codeArr[i+1]!=" "))...{
htmlTxt[htmlTxt.length] = codeArr[i] + " " + 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] + " " + this.getIdent();
break;
case 1:
htmlTxt[htmlTxt.length] = " " + this.getIdent();
this._tabNum++;
htmlTxt[htmlTxt.length] = codeArr[i] + " "+ 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] = " " + this.getIdent() + codeArr[i];
}else...{
htmlTxt[htmlTxt.length] = " " + 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]!=" "&&word[i]!=" "&&word[i]!=" ")...{
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 = [];
360docimg_501_ for(var i=0;i<this._tabNum;i++)...{
360docimg_502_ n[n.length] = " ";
360docimg_503_ }
360docimg_504_ return n.join("");
360docimg_505_ }
360docimg_506_}
360docimg_507_
360docimg_508_360docimg_509_function doformat(o)...{
360docimg_510_ var htmltxt = "";
360docimg_511_
360docimg_512_360docimg_513_ if (o == null)...{
360docimg_514_ alert("domNode is null!");
360docimg_515_ return;
360docimg_516_ }
360docimg_517_
360docimg_518_ var _codetxt = "";
360docimg_519_
360docimg_520_360docimg_521_ if(typeof(o)=="object")...{
360docimg_522_360docimg_523_ switch(o.tagName)...{
360docimg_524_ case "TEXTAREA":
360docimg_525_ case "INPUT":
360docimg_526_ _codetxt = o.value;
360docimg_527_ break;
360docimg_528_ case "DIV":
360docimg_529_ case "SPAN":
360docimg_530_ _codetxt = o.innerText;
360docimg_531_ break;
360docimg_532_ default:
360docimg_533_ _codetxt = o.innerHTML;
360docimg_534_ break;
360docimg_535_ }
360docimg_536_360docimg_537_ }else...{
360docimg_538_ _codetxt = o;
360docimg_539_ }
360docimg_540_
360docimg_541_ var _syn = new CLASS_FORMAT(_codetxt);
360docimg_542_ htmltxt = _syn.format();
360docimg_543_ return htmltxt;
360docimg_544_}
360docimg_545_
360docimg_546_
360docimg_547_function go()
360docimg_548_360docimg_549_...{
360docimg_550_ var code = document.getElementById("code").value;
360docimg_551_ var xx = new CLASS_FORMAT(code);
360docimg_552_ var a = new Date();
360docimg_553_
360docimg_554_360docimg_555_ if(document.getElementById('cboOperate').selectedIndex==1)...{
360docimg_556_ xx.isCompress=true;
360docimg_557_360docimg_558_ }else...{
360docimg_559_ xx.style = parseInt(document.getElementById('cboStyle').value);
360docimg_560_ }
360docimg_561_ document.getElementById("display").value = xx.format();
360docimg_562_ alert("共花：" + (new Date().getTime()-a.getTime()) + "ms");
360docimg_563_}
360docimg_564_//-->
360docimg_565_</SCRIPT>
360docimg_566_<TEXTAREA id=code rows=12 cols=100>
360docimg_567_/*
360docimg_568_这个是一个类
360docimg_569_*/
360docimg_570_
360docimg_571_
360docimg_572_function xx (num,str){//说明
360docimg_573_var a = num;this.aa = a;
360docimg_574_this.bb = function(){alert(str);}
360docimg_575_this.cc = function(){for(var i=0;i<10;i++){document.title=i;}}};
360docimg_576_
360docimg_577_xx.prototype.dd= function(){alert("d d kd");}
360docimg_578_
360docimg_579_var a = new xx(100,"hello"),b=new xx(0,"ttyp");
360docimg_580_if(1>2) { alert();
360docimg_581_ }
360docimg_582_ else {
360docimg_583_ alert(" hell ");
360docimg_584_ }
360docimg_585_
360docimg_586_a.bb();
360docimg_587_b.dd();
360docimg_588_alert(a.aa);
360docimg_589_
360docimg_590_</TEXTAREA> <BR>
360docimg_591_<select id="cboOperate" onchange="if(this.selectedIndex==1)document.getElementById('cboStyle').disabled=true;else document.getElementById('cboStyle').disabled=false;">
360docimg_592_ <option value="0">格式化</option>
360docimg_593_ <option value="1">压缩</option>
360docimg_594_</select>
360docimg_595_<select id="cboStyle">
360docimg_596_ <option value="0">经典</option>
360docimg_597_ <option value="1">微软</option>
360docimg_598_</select>
360docimg_599_<INPUT onclick=go() type=button value=go><br>
360docimg_600_<textarea id=display rows=12 cols=100>
360docimg_601_</textarea>
360docimg_602_</BODY></HTML>
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