September 2022
Intermediate to advanced
585 pages
8h 17m
Chinese
Content preview from JavaScript 经典实例：第三版
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Node
基础
｜
457
除端口之外，还可以指定
IP
地址（主机）。这样可以确保向指定的主机和端口发起
请求。如未提供主机，应用将监听与服务器关联的所有
IP
地址。你也可以指定一个
域名，让
Node
解析成主机。
上文用到的方法还有其他参数，可用的方法也还有很多，不过这里介绍的足够你上
手工作了。更多信息参阅
Node
文档（
http://nodejs.org/api
）。
17.3
使用
REPL
以交互的方式尝试
Node
代码
片段
17.3.1
问题
你想快速运行基于服务器的
Node
代码片段。
17.3.2
方案
使用
Node
的
REPL
（
Read-Evalute-Print-Loop
，读取
-
求值
-
输出循环）。这是
Node
的交互式命令行版本，可以运行任何代码片段。
若想使用
REPL
，在命令行中执行
node
命令，不指定要运行的应用。
$ node
然后就可以采用简化版
Emacs
（抱歉，不是
vi
）换行风格输入
JavaScript
代码了。
你可以导入库、创建函数，在普通应用中可以做的任何事。主要的区别是，现在每
一行代码将即时解释。
>
const
add = (x, y) => {
return
x + y };
undefined
> add(2, 2);
4
用完之后，输入
.exit
，退出程序。
458
｜
第
17
章
> .exit
17.3.3 ...
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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.