generate random word

random-word generater

function(length) {
  var range = function(start, end) {
    var result = [];
    for(var i=start; i<=end; i++) {
      result.push(i);
    }
    return result;
  };

  var source = (function(src, count) {
    var i = src.length;
    while(i) {
      var j = Math.floor(Math.random() * i);
      var t = src[--i];
      src[i] = src[j];
      src[j] = t;
    }
    return src.slice(0, count);
    // a-zA-Z0-9
  } ([].concat(range(48, 57), range(97, 122), range(65, 90)), length));

  return String.fromCharCode.apply(String, source);
}