[Deff]

<script type="text/javascript">
 var str = new String();
 //123456789
 str = prompt("Введите произвольный текст:");
 document.write(str.toLowerCase() + "<br>");

 var array = new Array();
 for (i = 0; i < str.length; i++){
   array[i] = str.charCodeAt(i);
 }
 array.length;
 array=array.sort(revers);
 alert(array);
 document.write(array.join(', '));

 function revers (arg1, arg2) {
 if (arg1 > arg2) return -1;
 if (arg1< arg2) return 1;
 if (arg1 == arg2) return 0;
 }
 </script>