lovio

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

lovio

/**
 * 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
 */

/**

lovio

/**
 * 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
 */

lovio

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

lovio

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

lovio

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