React Context API和Redux

16.3开始,React终于有了官方版Context API,这个API貌似很简单,但是影响却很大,网上有评论说Redux已Game Over,Redux作者也不得不承认React需要Redux的程度减少了许多,不过Redux的有些使用者认为,Redux已经成为一个生态系统,可用于其他很多场景。(这个看过的帖子一时找不到)

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upstart init.d systemd - a simple instruction

systemd

  • systemd is now supported by most linux system, and is the recommended way contrast to old upstart and init
  • the systemd config file is under /lib/systemd/system
  • env vars only able to be set in ExecStart or ExecStartPre, best way is to set in the script
  • WorkingDirectory can not use double quote, seems to be a bug?
  • if you app run like java -jar, should use Type=simple instead of Type=forking, otherwise it will case a timeout

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DBeaver a primary introduce

I used pgAdmin to connect to postgres, I think it is good, but when I use it to connect to a heroku database, I was shocked that it do list all the database(about 200) in the heroku server instance even I have choose the dafault database to connect. Imagine you have to scroll over the whole list to find a database name - and it do not support search! I then thought how stupid this tool is.

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flex和grid布局

首先Grid布局和Flex布局不是互斥的

  • Grid布局适合复杂的布局,例如可以用来设计整个页面的布局,可用来设计不合常规的创意布局。
  • Flex布局适合于对齐内容。
  • Grid布局适用于2d布局–行和列。
  • Flex适合同一个方向的布局。 能用Flex的简单处,没必要使用Grid。全部使用Flex也达不到好的效果,混合使用才是顺其自然的方式。

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