Alex1990

/**
 * A simple function can be used to generate a random string with the specified length.
 * And,the range of the characters is configurable.
 *
 * Default:
 *  len: 32
 *  chars: '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghiklmnopqrstuvwxyz'
 *
 * Note:
 *  The method charAt will convert its first parameter to an integer by floor.

Alex1990

/*
 * Notes: window.scrollX and window.scrollY is CSSOM Editor's Draft, but IE6-8 doesn't support it.
 * Date: 2014-8-30
 * Ref:
 *  http://help.dottoro.com/ljnvjiow.php
 *  http://stackoverflow.com/questions/19635188/why-is-body-scrolltop-deprecated
 *
 * Account for zoom example: http://stackoverflow.com/questions/16618785/ie8-alternative-to-window-scrolly#answer-16618863
 */

Alex1990

/*
 * The navigator.cookieEnabled always returns true even if you've disabled the cookie in IE (test IE8).
 * [Internet Options] -- [Privacy] -- [Advanced] && localhost (ie. local server, not file:///)
 * So, it's not dependable.
 * Ref:
 *  http://stackoverflow.com/questions/6125330/javascript-navigator-cookieenabled-browser-compatibility
 *  http://jsfiddle.net/ctRcB/
 */
function cookieEnabled() {
    return ('cookie' in document) && (document.cookie.length > 0 ||

Alex1990

/**
 * Check if a number has a decimal place.
 * Example:
 *  12 --> false
 *  -12 --> false
 *  0.12 --> true
 *  -0.12 --> true
 *  12.12 --> true
 *  -12.12 --> true
 * Reference:

Alex1990

/**
 * Escape html with no dependencies.
 * Ref:
 *  http://stackoverflow.com/questions/24816/escaping-html-strings-with-jquery#answer-12034334
 */
var escapeMap = {
  "<": "&lt;",
  ">": "&gt;",
  "&": "&amp;",
  "'": "&quot",

Alex1990

/**
 * Accessing nested object by the string (or namespace).
 * Ref:
 *  http://stackoverflow.com/questions/6491463/accessing-nested-javascript-objects-with-string-key
 */
function getProperty(obj, namespace) {
    var props = namespace.split(".");
    for (var i = 0; i < props.length; i++) {
        if (obj.hasOwnProperty(props[i])) {
            obj = obj[props[i]];

Alex1990

/**
 * Unique values in a array.
 *
 * Ref:
 *  http://stackoverflow.com/questions/1960473/unique-values-in-an-array#answer-14438954
 *  http://stackoverflow.com/questions/1960473/unique-values-in-an-array#answer-1961068
 *
 * Perf:
 *  http://jsperf.com/distinct-hash-vs-comparison
 */

Alex1990

// Some utility functions to check the object's type.
// Ref:
//  https://github.com/lifesinger/lifesinger.github.com/issues/175
//  https://github.com/seajs/seajs/issues/1314
// Note:
//  I think we should compare the compressed(min+gzip) file size.
function isType(type) {
    return function(obj) {
        return Object.prototype.toString.call(obj) == '[object ' + type + ']';
    };

Alex1990

/**
 * Get the number of days in a month in javascript.
 *
 * Ref:
 *  http://stackoverflow.com/questions/315760/what-is-the-best-way-to-determine-the-number-of-days-in-a-month-with-javascript
 */
function daysInMonth(year, month) {
    var now = new Date;

    month = typeof month != undefined ? month

Alex1990

/**
 * Check if a attribute exists on the element
 * 
 * IE6/7 doesn't support the `hasAttribute` method
 * 
 * Ref:
 *  http://codereview.stackexchange.com/questions/10131/will-this-test-to-check-if-an-element-has-an-attribute-work
 */

// Native javascript