blocks|key|212698|text|这过于简单了，但是Express.js之于Node.js就像Ruby+on+Rails或Sinatra之于Ruby一样。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|212699|Express+3.x是一个轻量级的web应用程序框架，有助于在服务器端将web应用程序组织到MVC架构中。您可以为模板语言使用各种选择(如EJS、Jade和Dust.js)。|212700|然后，您可以使用带有Mongoose+(用于建模)的MongoDB之类的数据库为您的Node.js应用程序提供后端。Express.js基本上可以帮助您管理一切，从路由到处理请求和视图。|212701|Redis是一个键/值存储--通常用于Node.js应用程序中的会话和缓存。你可以用它做更多的事情，但这就是我使用它的目的。我使用MongoDB处理更复杂的关系，比如行-项<->订单<->用户关系。有一些模块(最值得注意的是connect-redis)可以与Express.js一起工作。您需要在服务器上安装Redis数据库。|212702|下面是Express3.x指南的链接：https://expressjs.com/en/3x/api.html|212703|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Express.js|1|http://en.wikipedia.org/wiki/Node.js|2|http://en.wikipedia.org/wiki/Ruby_on_Rails|3|http://en.wikipedia.org/wiki/Sinatra_%2528software%2529|4|http://en.wikipedia.org/wiki/Ruby_%2528programming_language%2529|5|https://ejs.co/|6|http://jade-lang.com/|7|http://akdubya.github.io/dustjs/|8|https://en.wikipedia.org/wiki/Mongoose_%2528web_server%2529|9|http://en.wikipedia.org/wiki/MongoDB|10|http://en.wikipedia.org/wiki/Redis_%2528data_store%2529|11|https://expressjs.com/en/3x/api.html^0|9|A|0|L|7|1|U|D|2|18|7|3|1H|4|4|0|1Y|3|5|22|4|6|27|7|7|0|A|8|8|Q|7|9|0|4A|5|A|0|J|10|B|0^^$0|@$1|2|3|4|5|6|7|1F|8|@]|9|@$A|1G|B|1H|1|1I]|$A|1J|B|1K|1|1L]|$A|1M|B|1N|1|1O]|$A|1P|B|1Q|1|1R]|$A|1S|B|1T|1|1U]]|C|$]]|$1|D|3|E|5|6|7|1V|8|@]|9|@$A|1W|B|1X|1|1Y]|$A|1Z|B|20|1|21]|$A|22|B|23|1|24]]|C|$]]|$1|F|3|G|5|6|7|25|8|@]|9|@$A|26|B|27|1|28]|$A|29|B|2A|1|2B]]|C|$]]|$1|H|3|I|5|6|7|2C|8|@]|9|@$A|2D|B|2E|1|2F]]|C|$]]|$1|J|3|K|5|6|7|2G|8|@]|9|@$A|2H|B|2I|1|2J]]|C|$]]|$1|L|3|-4|5|6|7|2K|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]|V|$5|O|P|Q|C|$R|W]]|X|$5|O|P|Q|C|$R|Y]]|Z|$5|O|P|Q|C|$R|10]]|11|$5|O|P|Q|C|$R|12]]|13|$5|O|P|Q|C|$R|14]]|15|$5|O|P|Q|C|$R|16]]|17|$5|O|P|Q|C|$R|18]]|19|$5|O|P|Q|C|$R|1A]]|1B|$5|O|P|Q|C|$R|1C]]|1D|$5|O|P|Q|C|$R|1E]]]]

This is over simplifying it, but <a href="https://en.wikipedia.org/wiki/Express.js" rel="noreferrer">Express.js</a> is to <a href="http://en.wikipedia.org/wiki/Node.js" rel="noreferrer">Node.js</a> what <a href="http://en.wikipedia.org/wiki/Ruby_on_Rails" rel="noreferrer">Ruby on Rails</a> or <a href="http://en.wikipedia.org/wiki/Sinatra_%28software%29" rel="noreferrer">Sinatra</a> is to <a href="http://en.wikipedia.org/wiki/Ruby_%28programming_language%29" rel="noreferrer">Ruby</a>.

Express 3.x is a light-weight web application framework to help organize your web application into an MVC architecture on the server side. You can use a variety of choices for your templating language (like <a href="https://ejs.co/" rel="noreferrer">EJS</a>, <a href="http://jade-lang.com/" rel="noreferrer">Jade</a>, and <a href="http://akdubya.github.io/dustjs/" rel="noreferrer">Dust.js</a>).

You can then use a database like <a href="http://en.wikipedia.org/wiki/MongoDB" rel="noreferrer">MongoDB</a> with <a href="https://en.wikipedia.org/wiki/Mongoose_%28web_server%29" rel="noreferrer">Mongoose</a> (for modeling) to provide a backend for your Node.js application. Express.js basically helps you manage everything, from routes, to handling requests and views.

Redis is a key/value store -- commonly used for sessions and caching in Node.js applications. You can do a lot more with it, but that's what I'm using it for. I use MongoDB for more complex relationships, like line-item &lt;-> order &lt;-> user relationships. There are modules (most notably connect-redis) that will work with Express.js. You will need to install the <a href="http://en.wikipedia.org/wiki/Redis_%28data_store%29" rel="noreferrer">Redis</a> database on your server.

Here is a link to the Express 3.x guide: <a href="https://expressjs.com/en/3x/api.html" rel="noreferrer">https://expressjs.com/en/3x/api.html</a>

blocks|key|2854843|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2854844|+1)什么是Express.js？|blockquote|2854845|2854846|2854847|Express.js是一个Node.js框架。它是目前最流行的框架(在NPM上最受欢迎)。|offset|length|2854848|​|2854849|📷|atomic|2854850|。|2854851|它是围绕Connect中间件的配置和粒度简单性构建的。有些人将Express.js比作Ruby+Sinatra和笨重而固执己见的Ruby+on+Rails。|2854852|2854853|+2)+Node.js的用途是什么？|2854854|2854855|2854856|你不必一遍又一遍地重复相同的代码。Node.js是一个低级的I/O机制，它有一个超文本传输协议模块。如果你只是使用一个超文本传输协议模块，很多工作，比如解析负载、cookie、存储会话(在内存中或在Redis中)、基于regular+expressions选择正确的路由模式等，都需要重新实现。对于Express.js，它就在那里供您使用。|style|BOLD|2854857|2854858|+3)为什么我们真的需要Express.js？它对我们使用Node.js有什么用处？|2854859|2854860|2854861|第一个答案应该能回答你的问题。如果不是，那么尝试用普通的REST+(即只使用核心模块)编写一个小型的Node.js服务器，然后用Express.js编写。后者可以减少5-10倍的时间和代码行数。|2854862|2854863|什么是Redis？它是Express.js自带的吗？|2854864|2854865|2854866|Redis是一种快速持久的键值存储。您可以选择使用它通过Express.js存储会话，但您不需要这样做。默认情况下，Express.js具有用于会话的内存存储。Redis还可用于排队作业，例如，电子邮件作业。|2854867|查看my+tutorial+on+REST+API+server+with+Express.js。|2854868|2854869|+MVC，但不是它本身|2854870|2854871|2854872|Express.js本身是而不是，是一个模型-视图-控制器框架。您需要将自己的对象关系映射库，如用于MongoDB的Mongoose、用于SQL数据库的Sequelize+(http://sequelizejs.com)、用于许多数据库的Waterline+(https://github.com/balderdashy/waterline)放入堆栈中。|2854873|2854874|替代方案|2854875|2854876|2854877|要考虑的其他Node.js框架(https://www.quora.com/Node-js/Which-Node-js-framework-is-best-for-building-a-RESTful-API)：|2854878|更新:我整理了这个帮助人们选择Node.js框架的资源：http://nodeframework.com|2854879|UPDATE2:我们向nodeframework.com添加了一些GitHub统计数据，所以现在您可以在一个页面上比较30%2B框架的社会证明级别(GitHub星级)。|2854880|2854881|2854882|2854883|全栈：|2854884|2854885|http://sailsjs.org|unordered-list-item|2854886|http://derbyjs.com/|2854887|2854888|只需使用REST+API：|2854889|2854890|http://mcavage.github.io/node-restify/|2854891|2854892|Ruby+on+Rails类似于：|2854893|2854894|http://railwayjs.com/|2854895|http://geddyjs.org/|2854896|2854897|Sinatra类似于：|2854898|2854899|http://expressjs.com/|2854900|2854901|其他：|2854902|2854903|http://flatironjs.org/|2854904|https://github.com/isaacs/npm-www|2854905|http://frisbyjs.com/|2854906|2854907|中间件：|2854908|2854909|http://www.senchalabs.org/connect/|2854910|2854911|静态站点生成器：|2854912|2854913|http://docpad.org|2854914|https://github.com/jnordberg/wintersmith|2854915|http://blacksmith.jit.su/|2854916|https://github.com/felixge/node-romulus|2854917|https://github.com/caolan/petrify|2854918|2854919|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Express.js|1|http://en.wikipedia.org/wiki/Node.js|2|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/847de916a99546912de682cac096d577.png|imageAlt|3|http://en.wikipedia.org/wiki/Sinatra_%2528software%2529|4|http://en.wikipedia.org/wiki/Ruby_on_Rails|5|http://en.wikipedia.org/wiki/Input/output|6|http://en.wikipedia.org/wiki/Redis_%2528data_store%2529|7|http://en.wikipedia.org/wiki/Regular_expression|8|http://en.wikipedia.org/wiki/Representational_State_Transfer|9|http://www.webapplog.com/intro-to-express-js-simple-rest-api-app-with-monk-and-mongodb/|10|http://sequelizejs.com/|11|https://github.com/balderdashy/waterline|12|https://www.quora.com/Node-js/Which-Node-js-framework-is-best-for-building-a-RESTful-API|13|http://nodeframework.com/|14|https://ask.qcloudimg.com/http-save/yehe-900000/42a50187d0b9872b41fa3698f92653af.png|15|http://sailsjs.org/|16|17|18|19|20|21|22|23|24|25|http://docpad.org/|26|27|28|29^0|0|0|0|0|0|A|0|D|7|1|0|0|0|1|2|0|0|17|C|3|1S|D|4|0|0|0|0|0|3Y|4|U|3|5|2R|5|6|31|J|7|0|0|0|0|0|S|4|8|0|0|0|0|0|0|2|1A|9|0|0|0|0|0|D|3|2F|M|A|3M|14|B|0|0|0|0|0|G|2G|C|0|S|O|D|0|0|0|0|1|E|0|0|0|0|0|I|F|0|0|J|G|0|0|0|0|0|12|H|0|0|0|0|0|L|I|0|0|J|J|0|0|0|0|0|L|K|0|0|0|0|0|M|L|0|0|X|M|0|0|K|N|0|0|0|0|0|Y|O|0|0|0|0|0|H|P|0|0|14|Q|0|0|P|R|0|0|13|S|0|0|X|T|0|0^^$0|@$1|2|3|-4|4|5|6|5A|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|5B|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|5C|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|5D|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|5E|7|@]|8|@$H|5F|I|5G|1|5H]|$H|5I|I|5J|1|5K]]|9|$]]|$1|J|3|K|4|5|6|5L|7|@]|8|@]|9|$]]|$1|L|3|M|4|N|6|5M|7|@]|8|@$H|5N|I|5O|1|5P]]|9|$]]|$1|O|3|P|4|5|6|5Q|7|@]|8|@]|9|$]]|$1|Q|3|R|4|5|6|5R|7|@]|8|@$H|5S|I|5T|1|5U]|$H|5V|I|5W|1|5X]]|9|$]]|$1|S|3|-4|4|5|6|5Y|7|@]|8|@]|9|$]]|$1|T|3|U|4|C|6|5Z|7|@]|8|@]|9|$]]|$1|V|3|-4|4|5|6|60|7|@]|8|@]|9|$]]|$1|W|3|-4|4|5|6|61|7|@]|8|@]|9|$]]|$1|X|3|Y|4|5|6|62|7|@$H|63|I|64|Z|10]]|8|@$H|65|I|66|1|67]|$H|68|I|69|1|6A]|$H|6B|I|6C|1|6D]]|9|$]]|$1|11|3|-4|4|5|6|6E|7|@]|8|@]|9|$]]|$1|12|3|13|4|C|6|6F|7|@]|8|@]|9|$]]|$1|14|3|-4|4|5|6|6G|7|@]|8|@]|9|$]]|$1|15|3|-4|4|5|6|6H|7|@]|8|@]|9|$]]|$1|16|3|17|4|5|6|6I|7|@]|8|@$H|6J|I|6K|1|6L]]|9|$]]|$1|18|3|-4|4|5|6|6M|7|@]|8|@]|9|$]]|$1|19|3|1A|4|C|6|6N|7|@]|8|@]|9|$]]|$1|1B|3|-4|4|5|6|6O|7|@]|8|@]|9|$]]|$1|1C|3|-4|4|5|6|6P|7|@]|8|@]|9|$]]|$1|1D|3|1E|4|5|6|6Q|7|@]|8|@]|9|$]]|$1|1F|3|1G|4|5|6|6R|7|@]|8|@$H|6S|I|6T|1|6U]]|9|$]]|$1|1H|3|-4|4|5|6|6V|7|@]|8|@]|9|$]]|$1|1I|3|1J|4|C|6|6W|7|@]|8|@]|9|$]]|$1|1K|3|-4|4|5|6|6X|7|@]|8|@]|9|$]]|$1|1L|3|-4|4|5|6|6Y|7|@]|8|@]|9|$]]|$1|1M|3|1N|4|5|6|6Z|7|@$H|70|I|71|Z|10]]|8|@$H|72|I|73|1|74]|$H|75|I|76|1|77]]|9|$]]|$1|1O|3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<blockquote>
 1) What is Express.js?
</blockquote>

<a href="https://en.wikipedia.org/wiki/Express.js" rel="noreferrer">Express.js</a> is a <a href="http://en.wikipedia.org/wiki/Node.js" rel="noreferrer">Node.js</a> framework. It's the most popular framework as of now (the most starred on NPM).

<img src="https://i.stack.imgur.com/eRw5a.png" alt="Enter image description here">. 

It's built around configuration and granular simplicity of Connect middleware. Some people compare Express.js to <a href="http://en.wikipedia.org/wiki/Sinatra_%28software%29" rel="noreferrer">Ruby Sinatra</a> vs. the bulky and opinionated <a href="http://en.wikipedia.org/wiki/Ruby_on_Rails" rel="noreferrer">Ruby on Rails</a>.

<blockquote>
 2) What is the purpose of it with Node.js?
</blockquote>

That you don't have to repeat same code over and over again. Node.js is a low-level <a href="http://en.wikipedia.org/wiki/Input/output" rel="noreferrer">I/O</a> mechanism which has an HTTP module. If you just use an HTTP module, a lot of work like parsing the payload, cookies, storing sessions (in memory or in <a href="http://en.wikipedia.org/wiki/Redis_%28data_store%29" rel="noreferrer">Redis</a>), selecting the right route pattern based on <a href="http://en.wikipedia.org/wiki/Regular_expression" rel="noreferrer">regular expressions</a> will have to be re-implemented. With Express.js, it is just there for you to use.

<blockquote>
 3) Why do we actually need Express.js? How it is useful for us to use with Node.js?
</blockquote>

The first answer should answer your question. If no, then try to write a small <a href="http://en.wikipedia.org/wiki/Representational_State_Transfer" rel="noreferrer">REST</a> API server in plain Node.js (that is, using only core modules) and then in Express.js. The latter will take you 5-10x less time and lines of code.

<blockquote>
 What is Redis? Does it come with Express.js?
</blockquote>

Redis is a fast persistent key-value storage. You can optionally use it for storing sessions with Express.js, but you don't need to. By default, Express.js has memory storage for sessions. Redis also can be use for queueing jobs, for example, email jobs.

Check out <a href="http://www.webapplog.com/intro-to-express-js-simple-rest-api-app-with-monk-and-mongodb/" rel="noreferrer">my tutorial on REST API server with Express.js</a>.

<blockquote>
 MVC but not by itself
</blockquote>

Express.js is not an model-view-controller framework by itself. You need to bring your own object-relational mapping libraries such as Mongoose for MongoDB, Sequelize (<a href="http://sequelizejs.com" rel="noreferrer">http://sequelizejs.com</a>) for SQL databases, Waterline (<a href="https://github.com/balderdashy/waterline" rel="noreferrer">https://github.com/balderdashy/waterline</a>) for many databases into the stack.

<blockquote>
 Alternatives
</blockquote>

Other Node.js frameworks to consider (<a href="https://www.quora.com/Node-js/Which-Node-js-framework-is-best-for-building-a-RESTful-API" rel="noreferrer">https://www.quora.com/Node-js/Which-Node-js-framework-is-best-for-building-a-RESTful-API</a>):

UPDATE: I put together this resource that aid people in choosing Node.js frameworks: <a href="http://nodeframework.com" rel="noreferrer">http://nodeframework.com</a>

UPDATE2: We added some GitHub stats to nodeframework.com so now you can compare the level of social proof (GitHub stars) for 30+ frameworks on one page.

<img src="https://i.stack.imgur.com/1yIPs.png" alt="enter image description here">

Full-stack:

<ul>
<li><a href="http://sailsjs.org" rel="noreferrer">http://sailsjs.org</a></li>
<li><a href="http://derbyjs.com/" rel="noreferrer">http://derbyjs.com/</a></li>
</ul>

Just REST API:

<ul>
<li><a href="http://mcavage.github.io/node-restify/" rel="noreferrer">http://mcavage.github.io/node-restify/</a></li>
</ul>

Ruby on Rails like:

<ul>
<li><a href="http://railwayjs.com/" rel="noreferrer">http://railwayjs.com/</a></li>
<li><a href="http://geddyjs.org/" rel="noreferrer">http://geddyjs.org/</a></li>
</ul>

Sinatra like:

<ul>
<li><a href="http://expressjs.com/" rel="noreferrer">http://expressjs.com/</a></li>
</ul>

Other:

<ul>
<li><a href="http://flatironjs.org/" rel="noreferrer">http://flatironjs.org/</a></li>
<li><a href="https://github.com/isaacs/npm-www" rel="noreferrer">https://github.com/isaacs/npm-www</a></li>
<li><a href="http://frisbyjs.com/" rel="noreferrer">http://frisbyjs.com/</a></li>
</ul>

Middleware:

<ul>
<li><a href="http://www.senchalabs.org/connect/" rel="noreferrer">http://www.senchalabs.org/connect/</a></li>
</ul>

Static site generators:

<ul>
<li><a href="http://docpad.org" rel="noreferrer">http://docpad.org</a></li>
<li><a href="https://github.com/jnordberg/wintersmith" rel="noreferrer">https://github.com/jnordberg/wintersmith</a></li>
<li><a href="http://blacksmith.jit.su/" rel="noreferrer">http://blacksmith.jit.su/</a></li>
<li><a href="https://github.com/felixge/node-romulus" rel="noreferrer">https://github.com/felixge/node-romulus</a></li>
<li><a href="https://github.com/caolan/petrify" rel="noreferrer">https://github.com/caolan/petrify</a></li>
</ul>

blocks|key|210086|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|210087|Express.js是用于Node.js|ordered-list-item|210088|的模块化web框架，它用于更轻松地创建web应用程序，services|210089|Express.js简化了开发，并使编写安全、模块化和快速的应用程序变得更容易。您可以在普通的旧Node.js中完成所有这些工作，但是一些bug可能(并且将会)浮出水面，包括安全问题(例如，不转义字符串properly)|210090|Redis是一种内存中的数据库系统，以其快速性能而闻名。不能，但您可以通过redis客户端|210091|将其与Express.js一起使用|210092|我不能比这更简洁了。对于你的所有其他需求和信息，谷歌是你的朋友。|210093|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|P|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|Q|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|R|7|@]|8|@]|9|$]]|$1|F|3|G|4|C|6|S|7|@]|8|@]|9|$]]|$1|H|3|I|4|C|6|T|7|@]|8|@]|9|$]]|$1|J|3|K|4|5|6|U|7|@]|8|@]|9|$]]|$1|L|3|M|4|5|6|V|7|@]|8|@]|9|$]]|$1|N|3|-4|4|5|6|W|7|@]|8|@]|9|$]]]|O|$]]

<ol>
<li>Express.js is a modular web framework for Node.js</li>
<li>It is used for easier creation of web applications and services</li>
<li>Express.js simplifies development and makes it easier to write secure, modular and fast applications. You can do all that in plain old Node.js, but some bugs can (and will) surface, including security concerns (eg. not escaping a string properly)</li>
<li>Redis is an in-memory database system known for its fast
performance. No, but you can use it with Express.js using a redis
client</li>
</ol>

I couldn't be more concise than this. For all your other needs and information, Google is your friend.

blocks|key|214670|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|214671|什么是Express.js?|ordered-list-item|214672|214673|214674|+Express.js是一个Node.js+web应用程序服务器框架，设计用于构建单页面、多页面和混合web应用程序。它是node.js事实上的标准服务器框架。|blockquote|214675|214676|214677|构建在Express上的框架。|214678|有几个流行的Node.js框架构建在Express上：|214679|214680|+LoopBack:高度可扩展的开源Node.js框架，用于快速创建动态端到端REST+API。|214681|214682|Sails:+Node.js的MVC框架，用于构建实用的、生产就绪的应用程序。|214683|Kraken:通过提供结构和约定来扩展Express的安全和可伸缩层。|214684|意思:固执己见的全栈JavaScript框架，简化并加速了web应用程序的开发。|214685|214686|，|214687|，Node.js有什么用？|214688|214689|，我们为什么需要Express.js？|214690|对我们使用Node.js有何用处？|214691|Express添加了非常简单的路由和对Connect中间件的支持，允许许多扩展和有用的功能。|214692|例如,|214693|214694|想要会话吗？有没有|unordered-list-item|214695|想要POST正文/查询字符串解析？有没有|214696|想要通过jade、八字胡、ejs等简单的模板？它在那里|214697|想要优雅的错误处理，而不会导致整个服务器崩溃？|214698|214699|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|1P|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|1Q|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|1R|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|1S|7|@]|8|@]|9|$]]|$1|F|3|G|4|H|6|1T|7|@]|8|@]|9|$]]|$1|I|3|-4|4|5|6|1U|7|@]|8|@]|9|$]]|$1|J|3|-4|4|5|6|1V|7|@]|8|@]|9|$]]|$1|K|3|L|4|5|6|1W|7|@]|8|@]|9|$]]|$1|M|3|N|4|5|6|1X|7|@]|8|@]|9|$]]|$1|O|3|-4|4|5|6|1Y|7|@]|8|@]|9|$]]|$1|P|3|Q|4|H|6|1Z|7|@]|8|@]|9|$]]|$1|R|3|-4|4|5|6|20|7|@]|8|@]|9|$]]|$1|S|3|T|4|5|6|21|7|@]|8|@]|9|$]]|$1|U|3|V|4|5|6|22|7|@]|8|@]|9|$]]|$1|W|3|X|4|5|6|23|7|@]|8|@]|9|$]]|$1|Y|3|-4|4|5|6|24|7|@]|8|@]|9|$]]|$1|Z|3|10|4|5|6|25|7|@]|8|@]|9|$]]|$1|11|3|12|4|C|6|26|7|@]|8|@]|9|$]]|$1|13|3|10|4|5|6|27|7|@]|8|@]|9|$]]|$1|14|3|15|4|C|6|28|7|@]|8|@]|9|$]]|$1|16|3|17|4|5|6|29|7|@]|8|@]|9|$]]|$1|18|3|19|4|5|6|2A|7|@]|8|@]|9|$]]|$1|1A|3|1B|4|5|6|2B|7|@]|8|@]|9|$]]|$1|1C|3|-4|4|5|6|2C|7|@]|8|@]|9|$]]|$1|1D|3|1E|4|1F|6|2D|7|@]|8|@]|9|$]]|$1|1G|3|1H|4|1F|6|2E|7|@]|8|@]|9|$]]|$1|1I|3|1J|4|1F|6|2F|7|@]|8|@]|9|$]]|$1|1K|3|1L|4|1F|6|2G|7|@]|8|@]|9|$]]|$1|1M|3|-4|4|5|6|2H|7|@]|8|@]|9|$]]|$1|1N|3|-4|4|5|6|2I|7|@]|8|@]|9|$]]]|1O|$]]

<ol>
<li>What is Express.js?</li>
</ol>
<blockquote>
Express.js is a Node.js web application server framework, designed for
building single-page, multi-page, and hybrid web applications. It is
the de facto standard server framework for node.js.
</blockquote>
Frameworks built on Express.
Several popular Node.js frameworks are built on Express:
<blockquote>
LoopBack: Highly-extensible, open-source Node.js framework for quickly
creating dynamic end-to-end REST APIs.
Sails: MVC framework for
Node.js for building practical, production-ready apps.
Kraken: Secure and scalable layer that extends Express by providing structure and
convention.
MEAN: Opinionated fullstack JavaScript framework that
simplifies and accelerates web application development.
</blockquote>
<ol start="2">
<li>What is the purpose of it with Node.js?</li>
<li>Why do we actually need Express.js? How it is useful for us to use with Node.js?</li>
</ol>
Express adds dead simple routing and support for Connect middleware, allowing many extensions and useful features.
For example,
<ul>
<li>Want sessions? It's there</li>
<li>Want POST body / query string parsing? It's
there</li>
<li>Want easy templating through jade, mustache, ejs, etc? It's
there</li>
<li>Want graceful error handling that won't cause the entire server
to crash?</li>
</ul>

blocks|key|2855143|text|ExpressJS是建立在NodeJS之上的基本+web应用程序框架。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2855144|它可以用于快速构建WebApps、RESTFUL+API等。|2855145|支持多种模板引擎，如Jade、EJS等。|2855146|ExpressJS只保留了最低限度的功能作为核心特性，因此没有or或DB作为默认支持。但只需稍加努力，expressjs应用程序就可以与不同的数据库集成。|2855147|有关创建ExpressJS应用程序的入门指南，请查看以下链接：|2855148|ExpressJS+Introductory+Tutorial|2855149|entityMap|0|LINK|mutability|MUTABLE|url|https://rishabh.io/recipes/getting-started-with-express.html^0|M|2|0|0|0|0|0|0|V|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|11|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|12|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|13|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|14|8|@]|D|@$9|15|A|16|1|17]]|E|$]]|$1|P|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|W]]]]

ExpressJS is bare-bones web application framework on top of NodeJS.

It can be used to build WebApps, RESTFUL APIs etc quickly.

Supports multiple template engines like Jade, EJS. 

ExpressJS keeps only a minimalist functionality as core features and as such there are no ORMs or DBs supported as default. But with a little effort expressjs apps can be integrated with different databases.

For a getting started guide on creating ExpressJS apps, look into the following link: 

<a href="https://rishabh.io/recipes/getting-started-with-express.html" rel="noreferrer">ExpressJS Introductory Tutorial</a>

blocks|key|2855163|text|Express.js是用于Node的框架，它最常用作node+js的web应用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2855164|以下是有关如何使用express+https://www.youtube.com/watch?v=QEcuSSnqvck快速设置节点应用程序的视频的链接|offset|length|2855165|entityMap|0|LINK|mutability|MUTABLE|url|https://www.youtube.com/watch?v=QEcuSSnqvck^0|0|H|17|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Express.js is a framework used for Node and it is most commonly used as a web application for node js.

Here is a link to a video on how to quickly set up a node app with express <a href="https://www.youtube.com/watch?v=QEcuSSnqvck" rel="nofollow">https://www.youtube.com/watch?v=QEcuSSnqvck</a>

blocks|key|2855178|text|Express是Node的一个模块框架，您可以将其用于基于服务器的应用程序，这些应用程序将“侦听”来自客户端的任何输入/连接请求。当您在Node中使用它时，它只是说明您正在请求使用Node模块中的内置Express文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2855179|Express是许多以NodeJS为后端的Web应用程序的“支柱”。据我所知，它的主要资产是处理两台主机之间“交互”服务的路由系统。它有很多替代方案，比如Sails。|2855180|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Express is a module framework for Node that you can use for applications that are based on server/s that will "listen" for any input/connection requests from clients. When you use it in Node, it is just saying that you are requesting the use of the built-in Express file from your Node modules. 

Express is the "backbone" of a lot of Web Apps that have their back end in NodeJS. From what I know, its primary asset being the providence of a routing system that handles the services of "interaction" between 2 hosts. There are plenty of alternatives for it, such as Sails.

blocks|key|213295|text|Express.js由TJ+Holowaychuk创建，现在由社区管理。它是node.js中最流行的框架之一。Express还可用于开发各种产品，如web应用程序或RESTful+API.For等。有关更多信息，请访问expressjs.com官方网站。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|213296|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Express.js created by TJ Holowaychuk and now managed by the community. It is one of the most popular frameworks in the node.js. Express can also be used to develop various products such as web applications or RESTful API.For more information please read on the expressjs.com official site.

blocks|key|3068619|text|ExpressJS是一个web应用程序框架，它为您提供了一个简单的应用程序接口来构建网站、web应用程序和后端。使用ExpressJS，您无需担心低级协议、流程等。快速、无主见、简约的Node.js+web框架|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3068620|Pug+(早期称为Jade)是一种用于编写HTML模板的简洁语言。It−|3068621|生成HTML，支持动态代码，支持可重用性(DRY)，它是Express使用的最流行的模板语言之一。|3068622|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

ExpressJS is a web application framework that provides you with a simple API to build websites, web apps and back ends. With ExpressJS, you need not worry about low level protocols, processes, etc.
Fast, unopinionated, minimalist web framework for Node.js
Pug (earlier known as Jade) is a terse language for writing HTML templates. It −
Produces HTML
Supports dynamic code
Supports reusability (DRY)
It is one of the most popular template language used with Express.

blocks|key|3068624|text|它的力量的一个完美的例子|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3068625|router.route('/recordScore').post(async(req,+res)+=>+{+++



++
++let+gold_nation+=+req.body.gold+&&+req.body.gold.nationality;
++let+silver_nation+=+req.body.silver+&&+req.body.silver.nationality;
++let+bronze_nation+=+req.body.bronze+&&+req.body.bronze.nationality;
++let+competition_id+=+req.body.competition_id;

++console.log(gold_nation)
++console.log(silver_nation)
++req.body.gold+&&+await+country.updateOne({"flag"+:+gold_nation},+{+$inc:+{+gold:+1+}+});
++
++req.body.silver+&&+await+country.updateOne({"flag"+:+silver_nation},+{+$inc:+{+silver:+1+}+});
+
++req.body.bronze+&&+await+country.updateOne({"flag"+:+bronze_nation},+{+$inc:+{+bronze:+1+}+});
++console.log(competition_id)
++//await+competition.updateOne({"_id"+:+competition_id},+{$set:+{recorded+:+true}});
//!!+Uncomment+this+and+change+model/competition.ts+set+recorer+to+recorded
//+this+is+commented+out+so+you+can+test+adding+medals+for+every+case+and+not+creating+competitions+every+time
++res.status(200).json("Success");

});



++async+record(){
++++let+index+=+this.competitions.findIndex(e+=>+e._id+==+this.selectedCompetition);
++++let+goldIndex+=+this.competitors.findIndex(e+=>+e._id+==+this.goldWinner);
++++let+silverIndex+=+this.competitors.findIndex(e+=>+e._id+==+this.silverWinner);
++++let+bronzeIndex+=+this.competitors.findIndex(e+=>+e._id+==+this.bronzeWinner);

++++console.log(this.competitors[goldIndex]);
++++console.log(this.competitors[1-goldIndex]);

++++this.sportService.recordCompetition(this.competitors[goldIndex],+
++++++++++++++++++++++++++++++++++++this.competitors[1-goldIndex],
++++++++++++++++++++++++++++++++++++null,
++++++++++++++++++++++++++++++++++++this.competitions[index]).subscribe((m:string)+=>+this.reset(m))



++++}

++++reset(message:+string){
++++++this.statusMessage+=+message;
++++++++if(message+==+"Success"){
++++++++++
++++++++++this.competitions+=+this.competitions.filter(+(c)+=>+c._id+!=+this.selectedCompetition);
++++++++++this.goldWinner+=+'';
++++++++++this.silverWinner+=+'';
++++++++++this.bronzeWinner+=+'';
++++++++}
++
++
++++++++setTimeout(()=>{++++++++++++++++++++++++++
++++++++++this.statusMessage+=+'';
++++++++},+3000);
++++
++++}


router.route('/registerCompetitor').post(async(req,+res)+=>+{+++


++//!+PROVJERI+DA+LI+JE+FORMIRANJE+TAKMICENJA+ZAVRSENO

++let+competitors+=+req.body.map(+c+=>+({
++++name:+c.name,
++++gender:+c.gender,
++++nationality:+c.nationality,
++++sport:+c.sport,
++++disciplines:+c.disciplines
++}));
++console.log(competitors)
++await+country.updateOne({"flag"+:+competitors[0].nationality},+{+$inc:+{+numberOfCompetitors:+competitors.length+}+});


++await+++competitor.collection
++++++++++++++++++++++++++++++++++++.insertMany(competitors)
++++++++++++++++++++++++++++++++++++.then(+u+=>+{
++++++++++++++++++++++++++++++++++++++res.status(200).json("Ok")
++++++++++++++++++++++++++++++++++++})
++++++++++++++++++++++++++++++++++++.catch(err+=>{+res.status(400).json("notOk");
++++++++++++++++++++++++++++++++++});
++
++
});|code-block|syntax|javascript|3068626|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

A perfect example of its power
<pre><code>
router.route('/recordScore').post(async(req, res) =&gt; { 



 
 let gold_nation = req.body.gold &amp;&amp; req.body.gold.nationality;
 let silver_nation = req.body.silver &amp;&amp; req.body.silver.nationality;
 let bronze_nation = req.body.bronze &amp;&amp; req.body.bronze.nationality;
 let competition_id = req.body.competition_id;

 console.log(gold_nation)
 console.log(silver_nation)
 req.body.gold &amp;&amp; await country.updateOne({&quot;flag&quot; : gold_nation}, { $inc: { gold: 1 } });
 
 req.body.silver &amp;&amp; await country.updateOne({&quot;flag&quot; : silver_nation}, { $inc: { silver: 1 } });
 
 req.body.bronze &amp;&amp; await country.updateOne({&quot;flag&quot; : bronze_nation}, { $inc: { bronze: 1 } });
 console.log(competition_id)
 //await competition.updateOne({&quot;_id&quot; : competition_id}, {$set: {recorded : true}});
//!! Uncomment this and change model/competition.ts set recorer to recorded
// this is commented out so you can test adding medals for every case and not creating competitions every time
 res.status(200).json(&quot;Success&quot;);

});



 async record(){
 let index = this.competitions.findIndex(e =&gt; e._id == this.selectedCompetition);
 let goldIndex = this.competitors.findIndex(e =&gt; e._id == this.goldWinner);
 let silverIndex = this.competitors.findIndex(e =&gt; e._id == this.silverWinner);
 let bronzeIndex = this.competitors.findIndex(e =&gt; e._id == this.bronzeWinner);

 console.log(this.competitors[goldIndex]);
 console.log(this.competitors[1-goldIndex]);

 this.sportService.recordCompetition(this.competitors[goldIndex], 
 this.competitors[1-goldIndex],
 null,
 this.competitions[index]).subscribe((m:string) =&gt; this.reset(m))



 }

 reset(message: string){
 this.statusMessage = message;
 if(message == &quot;Success&quot;){
 
 this.competitions = this.competitions.filter( (c) =&gt; c._id != this.selectedCompetition);
 this.goldWinner = '';
 this.silverWinner = '';
 this.bronzeWinner = '';
 }
 
 
 setTimeout(()=&gt;{ 
 this.statusMessage = '';
 }, 3000);
 
 }


router.route('/registerCompetitor').post(async(req, res) =&gt; { 


 //! PROVJERI DA LI JE FORMIRANJE TAKMICENJA ZAVRSENO

 let competitors = req.body.map( c =&gt; ({
 name: c.name,
 gender: c.gender,
 nationality: c.nationality,
 sport: c.sport,
 disciplines: c.disciplines
 }));
 console.log(competitors)
 await country.updateOne({&quot;flag&quot; : competitors[0].nationality}, { $inc: { numberOfCompetitors: competitors.length } });


 await competitor.collection
 .insertMany(competitors)
 .then( u =&gt; {
 res.status(200).json(&quot;Ok&quot;)
 })
 .catch(err =&gt;{ res.status(400).json(&quot;notOk&quot;);
 });
 
 
});


</code></pre>

I am a learner in <a href="http://en.wikipedia.org/wiki/Node.js" rel="noreferrer">Node.js</a>.
<ol>
<li>What's <a href="https://en.wikipedia.org/wiki/Express.js" rel="noreferrer">Express.js</a>?</li>
<li>What's the purpose of it with Node.js?</li>
<li>Why do we actually need Express.js? How is it useful for us to use with Node.js?</li>
<li>What's <a href="https://en.wikipedia.org/wiki/Redis" rel="noreferrer">Redis</a>? Does it come with Express.js?</li>
</ol>

What is Express.js?

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我是的学习者。Node.js的用途是什么？，，，Express.js，，，Express.js，，，我们为什么真的需要Express.js？它对我们使用Node.js?What's 有什么用处？是Express.js自带的吗？

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