JavaScript加密解密压缩工具

 <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);
 }
 </a></tmp></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/>