javascript - Generate Random URL, but URL length can't be changed fro some reason? -

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as of i've been working on site bit of hobby during class. on site there basic text single button , text field. when press button generates random url , can add own extension it. @ moment it's send people random .onion domains. current problem cant length of url set random length. here code, if can recommend fix great. ` 

<body>    <script>      var 'x' = math.random() * 20    </script>    <script language="javascript" type="text/javascript">      function randomstring() {        var chars = "0123456789abcdefghiklmnopqrstuvwxyz";        var string_length = 'x';        var randomstring = '';        (var = 0; < string_length; i++) {          var rnum = math.floor(math.random() * chars.length);          randomstring += chars.substring(rnum, rnum + 1);        }        document.randform.randomfield.value = randomstring;      }    </script>    <form name="randform">      <input type="button" value="generate new base url" onclick="randomstring();">&nbsp;      <input type="text" name="randomfield" value="">    </form>  </body>

this works after fixed: 'x' => x

        var x = math.random() * 20;          function randomstring() {            var chars = "0123456789abcdefghiklmnopqrstuvwxyz";            var string_length = x;            var randomstring = '';            (var = 0; < string_length; i++) {              var rnum = math.floor(math.random() * chars.length);              randomstring += chars.substring(rnum, rnum + 1);            }            document.randform.randomfield.value = randomstring;          }
      <form name="randform">          <input type="button" value="generate new base url" onclick="randomstring();">&nbsp;          <input type="text" name="randomfield" value="">        </form>


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