code: function hextorstr(sHex) {
      var s = "";
      for (var i = 0; i < sHex.length - 1; i += 2) {
          s += String.fromCharCode(parseInt(sHex.substr(i, 2), 16));
      }
      return s;
  }
docs: convert a hexadecimal encoded string to raw string including non printable characters.<br/>
  @param {String} s hexadecimal encoded string
  @return {String} raw string
  @since 1.1.2
  @example
  hextorstr("610061") &rarr; "a\x00a"