其实只做了一件事情：写异步回调函数。

附带的成就是知道了如何调用cdn资源，如何使用bootstrap框架，如何jquery.

没有原生支持的类，如何“面向对象”开发

弱类型的js如何判断类型

改善numeric的计算误差

Mathjax for WordPress插件的开发者认为，$...$标签可能与$货币符号混淆，故用$latex标记公式。

为了通用性和简洁性，我通过插件改造把$latex改回了$，但又兼容已经书写过公式的既有文章。

主要改动是\$latex[= ](.*?[^\\\\])\$改为\$(latex){0,1}[= ](.*?[^\\\\])\$。

$latex a^2 $
$ a^2 $

• Run an existing MySQL-dump script

source [filename]

• switch Ubuntu mirror source

(take an eye on the version)

sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
(editing /etc/apt/sources.list)
sudo apt-get update
sudo apt-get upgrade

http://askubuntu.com/questions/645236/command-to-list-all-users-with-their-uid

• Test nginx.conf

  /usr/sbin/nginx -t

• Duplicate a MySQL database with its tables

  mysqldump [existing database] -u root -p’[password]’ –add-drop-table | mysql [new database] -u root -p’[password]’

• Check the direction of MySQL data files

  show variables like ‘%dir%’;

• Uninstall and reinstall node & npm

  sudo apt-get update
  sudo apt-get install nodejs
  sudo apt-get install npm

详解js和jquery里的this关键字

• MySQL:show columns of a certain datatable:

  show full columns from [tablename];

• Nginx:remove root directory

  root /usr/share/nginx/html;
  …
  location / {
  …
  fastcgi_param SCRIPT_FILENAME /usr/share/nginx/html$fastcgi_script_name;
  …
  }

  /etc/init.d/nginx restart

• Nginx:add rewrite rules for redirecting,map port 8080 into 80.

  server {
  listen 8080;
  server_name localhost_redirect;
  rewrite ^/(.+)/.* /$1 last;
  location / {
  proxy_pass http://127.0.0.1:80;
  proxy_set_header Host $host:80;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  }
  }

• Add sudoers

  whereis sudoers
  chmod u+w /etc/sudoers
  sudo nano /etc/sudoers
  chmod u-w /etc/sudoers

• Nginx installing

  • Download

    sudo apt-get install nginx
    sudo apt-get install php5-cli php5-cgi mysql-server php5-mysql
    sudo apt-get install php5-fpm

  • Edit profile

    sudo nano /etc/nginx/sites-available/default

    root /var/www/html; index index.php index.html index.htm;
location ~ \.php$ { include /etc/nginx/fastcgi_params; #需放在第一行，否则会出错 fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /var/www/nginx-default$fastcgi_script_name; }

  • Run

    sudo spawn-fcgi -a 127.0.0.1 -p 9000 -C 10 -u www-data -f /usr/bin/php-cgi
    /etc/init.d/nginx start

• Ubuntu 解决语言设置错误的问题，并正常输入输出中文
  安装localepurge管理语言文件

  sudo apt-get install localepurge

  当然也可以使用以下命令再次进行配置：

  sudo dpkg-reconfigure localepurg

  在本地对fish-shell进行配置：

  set -U LANG en_US.UTF-8
  set -U LC_ALL en_US.UTF-8

• Apache: Set Up Mod_Rewrite

  sudo a2enmod rewrite

• MySQL user management

  • enter interactive mode

    mysql -u [username] -h [hostname] -p

  • show all users

    select * {host,user,…} from mysql.user

  • add a user

    create user [username]@[hostname] identified by ‘[password]’

  • delete a user

    drop user [username]@[hostname]

  • give privileges (users not existed will be created)

    grant {all privileges,select,usage,…} on *.* to [username]@[hostname] identified ‘[password]’

  • retrieve privileges

    revoke {all privileges,select,usage,…} on *.* from [username]@[hostname] identified ‘[password]’

  • show privileges

    show grants for [username]@[hostname];

  All sorts of privileges

• Ubuntu Server用户管理

  • List all

    cut -d: -f1 /etc/passwd

  • Create

    sudo useradd [username]
    sudo passwd [username]

  • Delete

    sudo userdel [username]
    sudo rm -rf /home/[username]

  • List UIDs

    awk -F: ‘//home/ {printf “%s:%s\n”,$1,$3}’ /etc/passwd

• 使用vsftpd搭建ftp服务

  • Install

    sudo apt-get update
    sudo apt-get install vsftpd

  • Configure

    sudo nano /etc/vsftpd.conf

    Disallow anonymous, unidentified users to access files via FTP; change the anonymous_enable setting to NO:

  anonymous_enable=NO

    Disallow anonymous, unidentified users to access files via FTP; change the anonymous_enable setting to
  

Allow local uses to login by changing the local_enable setting to YES:
> local_enable=YES

    If you want local user to be able to write to a directory, then change the write_enable setting to YES:
> write_enable=YES

    [Solve `530 Login incorrect`](http://askubuntu.com/questions/413677/vsftpd-530-login-incorrect):
> pam_service_name=ftp

    [Solve `550 failed to change directory`](http://my.oschina.net/aiguozhe/blog/100161)
> chroot_local_user=NO

- Run
> sudo service vsftpd restart[/start/stop]

• Wordpress快速搭建
  Look through readme.html and go for it,but something in wp-config.php should be edited to optimize.

  • change language from English to Chinese

    /* To be added somewhere appropriate */
    define(‘WPLANG’, ‘zh_CN’);

  • download smoothly without a fuzzy FTP config (resolve the trouble caused by authority)

    chmod -R 755 [wordpress-directory]
    chown -R www-data [wordpress-directory]