gistfile1.js

var http = require('http');
var base = 'http://www.fighter.com.tw/updata/down_files/';

var patterns = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_".split('');
// var patterns = "ABC".split('');
var password_length = 2;

var level = 0;

var total_length = Math.pow(patterns.length , password_length);
console.log('total combine is : ' + total_length);

for (var i = 1; i <= total_length; i++) {

  var pwd = '';
  var index = i - 1 ;
  var point = [];

  var point = level.toString() + ',' + (index % patterns.length).toString();

  point = point.split(',');

  // console.log(point);

  if( i % patterns.length === 0 ){
    level++;    
  }

  // point

  point.forEach(function(element, index){
    var key = parseInt(element);
    pwd += patterns[key];
  });

  console.log(pwd);

};