Tony Tang d0zingcat

I hereby claim:

To claim this, I am signing this object:

单例模式

单例模式的主要作用是保证在Java程序中，某个类只有一个实例存在。一些管理器和控制器常被设计成单例模式。

单例模式有很多好处，它能够避免实例对象的重复创建，不仅可以减少每次创建对象的时间开销，还可以节约内存空间；能够避免由于操作多个实例导致的逻辑错误。如果一个对象有可能贯穿整个应用程序，而且起到了全局统一管理控制的作用，那么单例模式也许是一个值得考虑的选择。

docker Network differenece between EXPOSE and PUBLISH: Exposing ports is a way of documenting which ports are used, but does not actually map or open any ports. Exposing ports is optional.

command line proxy: proxychains

Without other narrates, this note is only intended for Debian or Ubuntu.

command	function	usage
update-alternatives	multi-version runnable program preference management
test -x ${file}	test if ${file} exists and granted with executable permission
if [ -f ${file} ]	test if this file is a regular file
set -e	cause the shell to exit if any subcommand or pipeline returns a non-zero status

commands	scope	common user cases
git reset	Commit	Discard commits in a private branch or throw away uncommited changes
git reset	File	Unstage a file
git checkot	Commit	switch between branches or inspect old snapshot
git checkout	File	Discard changes in the working directory
git revert	commit	Undo commits in a public branch
git revert	File	不支持
git push -u origin master	persistence	on next push, "origin master" can be ommitted.

	// ==UserScript==
	// @name GoogleKingKong
	// @namespace http://userstyles.org
	// @description 改善 Google 的搜索结果界面，提高阅读效率
	// @version 5.6
	// @author SUCCESS
	// @include http://www.google./search
	// @include http://www.google./#*
	// ==/UserScript==
	/* 更新记录 ***********************************************************************

	yum install m2crypto gcc -y
	wget -N --no-check-certificate https://download.libsodium.org/libsodium/releases/LATEST.tar.gz
	tar zfvx libsodium-*.tar.gz
	cd libsodium-*
	./configure
	make && make install
	echo "/usr/local/lib" >> /etc/ld.so.conf
	ldconfig

	# This code is for my post: Using Flask and LeanCloud to build a backend of Wechat Official Account
	# welcome to visit the post: https://blog.d0zingcat.xyz/2016/07/24/Python/Using%20Flask%20and%20LeanCloud%20to%20build%20a%20backend%20of%20Wechat%20Official%20Account/#more

	# coding: utf-8

	from datetime import datetime
	from flask import render_template, Flask, request, make_response, jsonify, abort
	from flask_sockets import Sockets
	from views.todos import todos_view
	import xml.etree.ElementTree as ET

	from PIL import Image
	import os, argparse, pexif




	def picProcessing(picPath, isForce=False):

	try:
	img = pexif.JpegFile.fromFile(picPath)

	https://www.google.com.hk/search?newwindow=1&q=compile+nginx&oq=compile+nginx&gs_l=psy-ab.3...391087.392005.0.392239.7.6.0.0.0.0.288.288.2-1.1.0....0...1.1.64.psy-ab..7.0.0.LWGlKWnAerY \| compile nginx - Google Search
	https://www.nginx.com/resources/admin-guide/installing-nginx-open-source/ \| How to Install NGINX Open Source \| NGINX
	https://www.digitalocean.com/community/tutorials/how-to-configure-nginx-as-a-web-server-and-reverse-proxy-for-apache-on-one-ubuntu-16-04-server \| How To Configure Nginx as a Web Server and Reverse Proxy for Apache on One Ubuntu 16.04 Server \| DigitalOcean
	https://www.digitalocean.com/community/tutorials/how-to-set-up-nginx-server-blocks-virtual-hosts-on-ubuntu-16-04 \| How To Set Up Nginx Server Blocks (Virtual Hosts) on Ubuntu 16.04 \| DigitalOcean
	https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-16-04 \| How To Install Nginx on Ubuntu 16.04 \| DigitalOcean
	https://www.digitalocean.com/community/tutorials/how-to-configure-the-nginx-web-server-on-a-virtua