Tony Huỳnh mrtonyhuynh

Callback là gì

Hiểu đơn giản thì callback là một function (A) được truyền vào 1 function khác (B) thông qua các tham số của B. Lúc này function B sẽ gọi đến function A để thực hiện 1 chức năng gì đó hoặc là khi function B hoàn thành chức năng của mình.

Ví dụ đơn giản:

function dihoc(callback){
// Làm các công việc cần thiết khi đi học. Và cuối cùng kết quả nhận được là thu lại kiến thức.
callback('Kiến thức');
}

Two way iframe communication

The main difference between the two pages is the method of sending messages. Recieving messages is the same in both.

Parent

Send messages to iframe using iframeEl.contentWindow.postMessage Recieve messages using window.addEventListener('message')

iframe

SQL to MongoDB Mapping Chart

SQL to MongoDB Mapping Chart¶

In addition to the charts that follow, you might want to consider the Frequently Asked Questions section for a selection of common questions about MongoDB.

Executables¶

The following table presents the MySQL/Oracle executables and the corresponding MongoDB executables.

	#!/bin/sh
	# Auto Install and Setup LEMP #
	#Example:sudo bash lemp16.4.sh -p MyPassword
	# By Saleh7 - https://github.com/Saleh7

	E=`tput setaf 1`
	G=`tput setaf 2`
	A=`tput setaf 3`
	C=`tput setaf 6`
	B=`tput bold`

	#!/bin/sh
	echo Install all AppStore Apps at first!
	# no solution to automate AppStore installs
	read -p "Press any key to continue... " -n1 -s
	echo '\n'

	echo Install and Set San Francisco as System Font
	ruby -e "$(curl -fsSL https://raw.github.com/wellsriley/YosemiteSanFranciscoFont/master/install)"
	echo Install Homebrew, Postgres, wget and cask
	ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

	#301 Redirects for .htaccess

	#Redirect a single page:
	Redirect 301 /pagename.php http://www.domain.com/pagename.html

	#Redirect an entire site:
	Redirect 301 / http://www.domain.com/

	#Redirect an entire site to a sub folder
	Redirect 301 / http://www.domain.com/subfolder/

	//helper function for 'x hours/minutes/seconds ago' - should be passed a time in php time format
	function time_elapsed_string($ptime)
	{
	$etime = time() - $ptime;

	if ($etime < 1)
	{
	return '0 seconds';
	}

	/**
	* https://gist.github.com/tborychowski/3799025
	*/
	var UTILS = {
	/jshint maxlen: 500, onevar: false /

	isTouch : (/iPhone\|iPod\|iPad/ig).test(navigator.userAgent),

	/**
	* Modified & lintified version of https://gist.github.com/527683

	Perl and PHP Regular Expressions

	PHP regexes are based on the PCRE (Perl-Compatible Regular Expressions), so any regexp that works for one should be compatible with the other or any other language that makes use of the PCRE format. Here are some commonly needed regular expressions for both PHP and Perl. Each regex will be in string format and will include delimiters.
	All Major Credit Cards

	This regular expression will validate all major credit cards: American Express (Amex), Discover, Mastercard, and Visa.

	//All major credit cards regex
	'/^(?:4[0-9]{12}(?:[0-9]{3})?\|5[1-5][0-9]{14}\|6011[0-9]{12}\|622((12[6-9]\|1[3-9][0-9])\|([2-8][0-9][0-9])\|(9(([0-1][0-9])\|(2[0-5]))))[0-9]{10}\|64[4-9][0-9]{13}\|65[0-9]{14}\|3(?:0[0-5]\|[68][0-9])[0-9]{11}\|3[47][0-9]{13})*$/'