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angular.module('myApp').factory('_', function(){
  return window._;
})

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function generateRandomAlphaNum(len) {
    var rdmString = "";
    for (; rdmString.length < len; rdmString += Math.random().toString(36).substr(2));
    return rdmString.substr(0, len);
};

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res.type = function(type){
  return this.set('Content-Type', ~type.indexOf('/')
    ? type
    : mime.lookup(type));
};

# 判断Cotent-Type中是否有/，比如application/json
# 如果有就去查询mime
# 在js中， null, undefined , '' 以及0都是false
# ~-1 === 0

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/**
 * 将一个10进制的数字字符串转换成36进制
 */
function to36 (str) {
  return Number(str).toString(36);
}

/**
 * 从36进制的字符串转换成10进制
 */

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/**
 * ONLY TO MAKE $RESPONSE EASY TO USE
 *  in some case, Backend will respond every request with a 200 http status code
 *  and [error_or_not, data] array.
 *  It's very difficult to use when writing front-end code with angular.
 *
 *  The purpose of this module is to transform it to legal one
 */

/**

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var crypto = require('crypto');
var shasum = crypto.createHash('sha1'); // this will return a hash object

// It is a stream that is both readable and writable. The written data is used to compute the hash.
// Once the writable side of the stream is ended, use the read() method to get the computed hash digest. 
// The legacy update and digest methods are also supported.

shasum.update('some data needs to be hashed and can be called many times');
console.log(shasum.digest('hex'));
// hex, binary or base, a buffer is returned is no encoding provided

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var crypto = require('crypto');

var makeSalt = function() {
  return crypto.randomBytes(16).toString('base64');
};

var hashPassword = function(password){
  var salt = new Buffer(makeSalt, 'base64');
  return crypto.pbkdf2Sync(password, salt, 10000, 64).toString('base64');
}

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1. 用户名+ 密码 =》 id + token
2. str = [参数, random_number] 字典升序.join('')
3. sign = md5( id + str + token);

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.btn-container-selector ~ .btn-container-selector > .btn-container {
  border-left: none;
}

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// connect mongodb
var mongoose = require('mongoose');
// 见https://github.com/LearnBoost/mongoose/issues/1251
mongoose.models = {};
mongoose.modelSchemas = {};

var clearDB = function(done){
  async.parallel([
    function (cb) {
    Coupon.collection.remove(cb)