Novice's express4.0 Note API

App.set (name, value) settings

The following settings would alter how Express behaves:

Express built-in parameters

• env Environment mode, defaults to process.env.NODE_ENV (node_env environment variable) or "development"
• trust proxy Enables reverse proxy support, disabled by default
• subdomain offsetThe number of dot-separated parts of the host to remove to access subdomain, both by default
• jsonp callback name Changes the default callback name of?callback=
• json replacer JSON Replacer callback, NULL by default
• case sensitive routing Enable case sensitivity, disabled by default, treating "/foo" and "/foo" as the same
• strict routing Enable Strict routing, by default "/foo" and "/foo/" is treated the same by the router
• view cache Enables view template compilation caching, enabled in production by default
• view engine The default engine extension to use when omitted
• views The view directory path, defaulting to "PROCESS.CWD () + '/views '"
• x-powered-by Enables X-Powered-By: Express the HTTP header, enabled by default

You can also customize the parameters

Assigns setting name to value .

App.set (' title ', ' My Site '); App.get (' title '); // = "My Site"

App.get (name)

Get setting name value.

App.get (' title '); // = undefined app.set (' title ', ' My Site '); App.get (' title '); // = "My Site"

App.use ([path], function)

Use the given middleware function (with optional Mount path , defaulting to "/").

varExpress = require ('Express');varApp =Express ();//Simple LoggerApp.use (function (req, res, next) {Console.log ('%s%s', Req.method, Req.url); Next ();});//RespondApp.use (function (req, res, next) {Res.send ('Hello World');}); App.listen ( the);

将指定的中间件挂在到路径上,默认的路径是"/"

The "mount" path is stripped and was not visible to the middleware function . This feature was mainly to ensure that mounted middleware may operate without code changes, regardless of the "prefix" Path Name.

Here ' s a concrete example. Take the typical use-case of serving files in./public using the express.static() middleware:

‘/public‘));
Specify the file path, equivalent to the Windows environment settings
Assuming that the above code is set, you can access the Localhost:3000/photo.jpg equivalent to direct access

Localhost:3000/public/photo.jpg

而这个访问的内部是隐藏起来的,你是无法知道真实的路径的 这样可以确保代码经过修改后无需关注前缀名称
下面是更加详尽的代码解释

 var  logger = require ( " morgan   "  static  (__dirname +       hello     

App.use (Express.  Static'/public'); App.use (Logger ()); App.use (function (req, res) {  Res.send ('Hello');});

Test Access Http://localhost:3000/11.jpg

The first paragraph above uses the middleware to display the path get/11.jpg, while the second code does not show

App.use (express.static (__dirname + '/public '+ '/files '+ '/uploads '));

/public will take precedence over several other

Novice's express4.0 Note API