<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) {
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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);
}
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<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>