在线Demo：http://www.senparc.com/WebTools.xhtml/JsPack
把下列代码保存为.html直接在浏览器中打开就能用
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><html><head><title>Javascript Compressor</title><meta http-equiv="Content-Type" content="text/html; charset=GB2312" />
<script type="text/javascript">
function ICommon(that){
if(that!=null){
that.inherit=Common.prototype.inherit; that.specialize=Common.prototype.specialize
}return that};ICommon.specialize=function(p,c){if(!p)p={};if(!c)c=p.constructor;if(c=={}.constructor) c=new Function("this.inherit()");c.valueOf=new Function("return this");c.valueOf.prototype=new this.valueOf;c.valueOf.prototype.specialize(p);c.prototype=new c.valueOf;c.valueOf.prototype.constructor=c.prototype.constructor=c;c.ancestor=this;c.specialize=arguments.callee;c.ancestorOf=this.ancestorOf;return c};ICommon.valueOf=new Function("return this");ICommon.valueOf.prototype={constructor:ICommon,inherit:function(){ return arguments.callee.caller.ancestor.apply(this,arguments)},specialize:function(that){ if(this==this.constructor.prototype&&this.constructor.specialize){ return this.constructor.valueOf.prototype.specialize(that) } for(var i in that){ switch(i){ case"constructor":case"toString":case"valueOf":continue } if(typeof that[i]=="function"&&that[i]!=this[i]){ that[i].ancestor=this[i] } this[i]=that[i] } if(that.toString!=this.toString&&that.toString!={}.toString){ that.toString.ancestor=this.toString; this.toString=that.toString } return this}};function Common(){};this.Common=ICommon.specialize({constructor:Common,toString:function(){ return"[common "+(this.constructor.className||"Object")+"]"},instanceOf:function(klass){ return this.constructor==klass||klass.ancestorOf(this.constructor)}});Common.className="Common";Common.ancestor=null;Common.ancestorOf=function(klass){while(klass&&klass.ancestor!=this) klass=klass.ancestor;return Boolean(klass)};Common.valueOf.ancestor=ICommon;function ParseMaster(){var E=0,R=1,L=2;var G=/\(/g,S=/\$\d/,I=/^\$\d+$/,T=/(['"])\1\+(.*)\+\1\1$/,ES=/\\./g,Q=/'/,DE=/\x01[^\x01]*\x01/g;var self=this;this.add=function(e,r){ if(!r)r=""; var l=(_14(String(e)).match(G)||"").length+1; if(S.test(r)){ if(I.test(r)){ r=parseInt(r.slice(1))-1 }else{ var i=l; var q=Q.test(_14(r))?'"':"'"; while(i) r=r.split("$"+i--).join(q+"+a[o+"+i+"]+"+q); r=new Function("a,o","return"+q+r.replace(T,"$1")+q) } } _33(e||"/^$/",r,l)};this.exec=function(s){ _3.length=0; return _30(_5(s,this.escapeChar).replace(new RegExp(_1,this.ignoreCase?"gi":"g"),_31),this.escapeChar).replace(DE,"")};this.reset=function(){ _1.length=0}; var _3=[]; var _1=[]; var _32=function(){ return"("+String(this[E]).slice(1,-1)+")" };_1.toString=function(){return this.join("|")};function _33(){ arguments.toString=_32; _1[_1.length]=arguments}function _31(){ if(!arguments[0]) return""; var i=1,j=0,p; while(p=_1[j++]){ if(arguments[i]){ var r=p[R]; switch(typeof r){ case"function":return r(arguments,i); case"number":return arguments[r+i] } var d=(arguments[i].indexOf(self.escapeChar)==-1)?"":"\x01"+arguments[i]+"\x01"; return d+r }else i+=p[L] }};function _5(s,e){return e?s.replace(new RegExp("\\"+e+"(.)","g"),function(m,c){ _3[_3.length]=c; return e }):s};function _30(s,e){var i=0;return e?s.replace(new RegExp("\\"+e,"g"),function(){ return e+(_3[i++]||"")}):s };function _14(s){return s.replace(ES,"")}};ParseMaster.prototype={ constructor:ParseMaster,ignoreCase:false,escapeChar:"" };if(/MSIE 5.0/.test(navigator.userAgent)) new function(){ var ap=function(f,o,a){f.apply(o,a)}; if(''.replace(/^/,String)){ var _28=String.prototype.replace; var _29=function(e,r){ var m,n="",s=this; while(s&&(m=e.exec(s))){ n+=s.slice(0,m.index)+ap(r,this,m); s=s.slice(m.lastIndex) } return n+s }; String.prototype.replace=function(e,r){ this.replace=(typeof r=="function")?_29:_28; return this.replace(e,r) } } if(!Function.apply){ var APPLY="apply-"+Number(new Date); ap=function(f,o,a){ var r; o[APPLY]=f; switch(a.length){ case 0:r=o[APPLY]();break; case 1:r=o[APPLY](a[0]);break; case 2:r=o[APPLY](a[0],a[1]);break; case 3:r=o[APPLY](a[0],a[1],a[2]);break; case 4:r=o[APPLY](a[0],a[1],a[2],a[3]);break; default:var aa=[],i=a.length-1;do aa[i]="a["+i+"]";while(i--);eval("r=o[APPLY]("+aa+")") } delete o[APPLY]; return r }; if(typeof ICommon=="function") ICommon.valueOf.prototype.inherit=function(){ return ap(arguments.callee.caller.ancestor,this,arguments) } } if(![].push) Array.prototype.push=function(){ for(var i=0;i<arguments.length;i++){ this[this.length]=arguments[i] } return this.length }; if(![].pop) Array.prototype.pop=function(){ var i=this[this.length-1]; this.length--; return i }};function pack(_7,_0,_2,_8){ var I="$1";_7+="\n"; _0=Math.min(parseInt(_0),95); function _15(s){ var i,p; for(i=0;(p=_6[i]);i++){s=p(s)} return s }; var _25=function(p,a,c,k,e,d){ while(c--) if(k[c]) p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]); return p};var _26=function(){ if(!''.replace(/^/,String)){ while(c--)d[e(c)]=k[c]||e(c); k=[function(e){return d[e]}]; e=function(){return'\\w+'}; c=1 }};var _6=[];function _4(p){ _6[_6.length]=p};function _18(s){ var p=new ParseMaster; p.escapeChar="\\"; p.add(/'[^'\n\r]*'/,I); p.add(/"[^"\n\r]*"/,I); p.add(/\/\/[^\n\r]*[\n\r]/," "); p.add(/\/\*[^*]*\*+([^\/][^*]*\*+)*\//," "); p.add(/\s+(\/[^\/\n\r\*][^\/\n\r]*\/g?i?)/,"$2"); p.add(/[^\w\x24\/'"*)\?:]\/[^\/\n\r\*][^\/\n\r]*\/g?i?/,I); if(_8)p.add(/;;;[^\n\r]+[\n\r]/); p.add(/\(;;\)/,I); p.add(/;+\s*([};])/,"$2"); s=p.exec(s); p.add(/(\b|\x24)\s+(\b|\x24)/,"$2 $3"); p.add(/([+\-])\s+([+\-])/,"$2 $3"); p.add(/\s+/,""); return p.exec(s)};function _17(s){ var p=new ParseMaster; p.add(/((\x24+)([a-zA-Z_]+))(\d*)/,function(m,o){ var l=m[o+2].length; var s=l-Math.max(l-m[o+3].length,0); return m[o+1].substr(s,l)+m[o+4] }); var r=/\b_[A-Za-z\d]\w*/; var k=_13(s,_9(r),_21); var e=k.e; p.add(r,function(m,o){return e[m[o]]}); return p.exec(s)};function _16(s){ if(_0>62)s=_20(s); var p=new ParseMaster; var e=_12(_0); var r=(_0>62)?/\w\w+/ :/\w+/; k=_13(s,_9(r),e); var e=k.e; p.add(r,function(m,o){return e[m[o]]}); return s&&_27(p.exec(s),k)};function _13(s,r,e){ var a=s.match(r); var so=[]; var en={}; var pr={}; if(a){ var u=[]; var p={}; var v={}; var c={}; var i=a.length,j=0,w; do{ w="$"+a[--i]; if(!c[w]){ c[w]=0; u[j]=w; p["$"+(v[j]=e(j))]=j++ } c[w]++ } while(i); i=u.length; do{ w=u[--i]; if(p[w]!=null){ so[p[w]]=w.slice(1); pr[p[w]]=true; c[w]=0 } } while(i); u.sort(function(m1,m2){return c[m2]-c[m1]}); j=0; do{ if(so[i]==null) so[i]=u[j++].slice(1); en[so[i]]=v[i] } while(++i<u.length) } return{s:so,e:en,p:pr}};function _27(p,k){ var E=_10("e\\(c\\)","g"); p="'"+_5(p)+"'"; var a=Math.min(k.s.length,_0)||1; var c=k.s.length; for(var i in k.p) k.s[i]=""; k="'"+k.s.join("|")+"'.split('|')"; var e=_0>62?_11:_12(a); e=String(e).replace(/_0/g,"a").replace(/arguments\.callee/g,"e"); var i="c"+(a>10?".toString(a)":""); if(_2){ var d=_19(_26); if(_0>62)d=d.replace(/\\\\w/g,"[\\xa1-\\xff]"); else if(a<36)d=d.replace(E,i); if(!c)d=d.replace(_10("(c)\\s*=\\s*1"),"$1=0") } var u=String(_25); if(_2){ u=u.replace(/\{/,"{"+d+";") } u=u.replace(/"/g,"'"); if(_0>62){ u=u.replace(/'\\\\b'\s*\+|\+\s*'\\\\b'/g,"") } if(a>36||_0>62||_2){ u=u.replace(/\{/,"{e="+e+";") }else{ u=u.replace(E,i) } u=pack(u,0,false,true); var p=[p,a,c,k]; if(_2){ p=p.concat(0,"{}") } return"eval("+u+"("+p+"))\n"};function _12(a){return a>10?a>36?a>62?_11:_22:_23:_24};var _24=function(c){ return c };var _23=function(c){ return c.toString(36) };var _22=function(c){ return(c<_0?'':arguments.callee(parseInt(c/_0)))+((c=c%_0)>35?String.fromCharCode(c+29):c.toString(36)) };var _11=function(c){ return(c<_0?'':arguments.callee(c/_0))+String.fromCharCode(c%_0+161) };var _21=function(c){ return"_"+c };function _5(s){ return s.replace(/([\\'])/g,"\\$1") };function _20(s){ return s.replace(/[\xa1-\xff]/g,function(m){ return"\\x"+m.charCodeAt(0).toString(16) }) };function _10(s,f){ return new RegExp(s.replace(/\$/g,"\\$"),f) };function _19(f){ with(String(f))return slice(indexOf("{")+1,lastIndexOf("}")) };function _9(r){ return new RegExp(String(r).slice(1,-1),"g") };_4(_18);if(_8)_4(_17);if(_0)_4(_16);return _15(_7)};var input,output;onload=function(){if(!document.getElementById||''.replace(/^/,String))return;input=document.getElementById("input");//内容 文本区域var message=document.getElementById("message");//消息 var encoding=document.getElementById("ascii-encoding");//编码方式 选择列表 值有0、10、62、95var fastDecode=document.getElementById("fast-decode");//快速解码 选择框var specialChars=document.getElementById("special-chars");//特殊字符 选择框function packScript(){//执行压缩 try{ if(input.value){ input.value=pack(input.value,encoding.value,fastDecode.checked,specialChars.checked); //调用编码函数 输入代码， 编码方式， 是否快速解码， 是否特殊字符 } }catch(e){ reportError("error packing script",e.message) }};function decodeScript(){//执行解码 try{ if(input.value.substring(0,27)=="eval(function(p,a,c,k,e,d){"){ eval("input.value=String"+input.value.slice(4)); } else reportError("代码解码取消","您的代码没有用此方法压缩！"); }catch(e){ reportError("代码解码错误",e.message) }};function enableFastDecode(){ fastDecode.disabled=Boolean(encoding.value==0); fastDecode.parentNode.className=(encoding.value==0)?"disabled":""};function reportError(m,e){ message.innerHTML=m+(e?": "+e:""); message.className="error"};encoding.onclick=enableFastDecode;var buttons=document.getElementsByTagName("button");var button,i;for(i=0;(button=buttons[i]);i++){ var handler=eval(button.id); button.onclick=handler; handler.button=button}};</script></head><body ><form id="packer" action="" method="post"> <label for="input">Paste your code:</label> <br /> <textarea id="input" name="input" rows="10" cols="79"></textarea><div class="r ar"> <p id="controls"> <label for="ascii-encoding">Encoding:</label> <select id="ascii-encoding" name="ascii_encoding"> <option value="0">None</option> <option value="10">Numeric</option> <option value="62" selected="selected">Normal</option> <option value="95">High ASCII</option> </select><br /> <label for="fast-decode">Fast Decode: <input type="checkbox" id="fast-decode" name="fast_decode" value="1" checked="checked"/></label><br /> <label for="special-chars">Special Characters: <input type="checkbox" id="special-chars" name="special_chars" value="1"/></label></p> </div> <button type="button" id="packScript">Compress</button><button type="button" id="decodeScript" >Decode</button><p id="message"></p></form></body></html>界面：
输入js代码：
Compress之后的显示效果：
PS：这段代码是我很久前在网上找的，现在可能有更新的版本或者压缩形式，如果有更好的，欢迎交流！
