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Js加密解密Encode,Decode函数

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Js encode,decode</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
</head>
<body>
<script>
a=62;
function encode() {
var code = document.getElementById(''code'').value;
code = code.replace(/[\r\n]+/g, '''');
code = code.replace(/''/g, "\\''");
var tmp = code.match(/\b(\w+)\b/g);
tmp.sort();
var dict = [];
var i, t = '''';
for(var i=0; i<tmp.length; i++) {
if(tmp[i] != t) dict.push(t = tmp[i]);
}
var len = dict.length;
var ch;
for(i=0; i<len; i++) {
ch = num(i);
code = code.replace(new RegExp(''\\b''+dict[i]+''\\b'',''g''), ch);
if(ch == dict[i]) dict[i] = '''';
}
document.getElementById(''code'').value = "eval(function(p,a,c,k,e,d){e=function(c){return(c<a?'''':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);k=[function(e){return d[e]}];e=function(){return''\\\\w+''};c=1};while(c--)if(k[c])p=p.replace(new RegExp(''\\\\b''+e(c)+''\\\\b'',''g''),k[c]);return p}("
+ "''"+code+"'',"+a+","+len+",''"+ dict.join(''|'')+"''.split(''|''),0,{}))";
}
function num(c) {
return(c<a?'''':num(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36));
}
function run() {
eval(document.getElementById(''code'').value);
}
function decode() {
var code = document.getElementById(''code'').value;
code = code.replace(/^eval/, '''');
document.getElementById(''code'').value = eval(code);
}
</script>
<textarea id=code cols=80 rows=20>
</textarea><br>
<input type=button onclick=encode() value=编码>
<input type=button onclick=run() value=执行>
<input type=button onclick=decode() value=解码>
</body>
</html>