June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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司名到公司地址的这一层抽象是有用的，其另一个原因是，一个组织可能会搬家（得到一
个新的公司地址），但就算它搬家了，人们也依旧能够找到（事实上，在本书第
1
版和第
2
版出版之间，
Apple
公司的总部就搬了一次）
。
而
托管
，说的是运行网站的计算机。继续以实际事物作类比，托管就相当于你到达实际地
址后所看到的建筑。域名注册跟托管其实没有什么关系，这一点人们常常会混淆。况且，
通常你并不是从托管商那里购买域名（与之类似，你从一个人手里买到了一块土地，但通
常需要向另外一个人付费，让他来建造和装修房子）。
尽管可以运行网站而不使用域名，但是这样很不友好，因为
IP
地址并不适合做市场推广
。
通常在购买托管服务时，系统会自动给你分配一个子域名（一会儿就要讨论），可以认为
这个子域名是介于适合市场推广的域名与
IP
地址之间的。
一旦有了域名，并且网站上线之后，你就可以通过多个
URL
访问到你的网站。例如：
• http://meadowlarktravel.com/
• http://www.meadowlarktravel.com/
• http://ec2-54-201-235-192.us-west-2.compute.amazonaws.com/
• http://54.201.235.192/
多亏了域名映射，所有这些地址才都指向了同一个网站。一旦请求到达了你的网站，基于
请求所使用的
URL
来采取不同的操作也是可以做到的
。比如说，如果有人使用
IP
地址访
问到了你的网站，你就可以自动地重定向到域名，不过这样做并不常见，因为没有什么意 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.