') , client = redis.createClient(); client.on('error', function (err) { console.log('Error ' + err);}); client.on('connect', runSample); function runSample() { // Set a value with an expiration client.set('string key', 'Hello World', redis.print); // Expire in 3 seconds client.expire('string key', 3); // This timer is only to demo the TTL // Runs every second until the timeout // occurs on the value var myTimer = setInterval(function() {
This article mainly introduces node. emitter in js. the usage of the on method is described in this article. on Method description, syntax, receive parameters, use instances and implementation source code. For more information, see
Method description:
Registers a listener for a specified event.
Syntax:
The Code is as follows:
Emitter. on (event, listener)Emitter. addListener (event, listener)
Receiving
This article mainly introduces Node in detail. if you are interested in js data push, refer to the following scenario: backend update data is pushed to the client (Tomcat server is used in Java ).
There are many solutions for pushing data at the backend, such as polling, Comet, and WebSocket.
1. polling is the lowest development cost for the backend, that is, processing Ajax requests and returning data in
This article analyzes and explains node through several examples. the use of require in js is very detailed. Here we recommend that you provide a very clear description in the code comments. Here we will not talk nonsense about it. We will provide the Code directly:
The Code is as follows:
/* In node, you can use the require () function to load modules.* The r
As a good Restfull Api, it is not only about the semantics, readability, power, and orthogonal of service URLs, but also about http Status codes. A good Http Status Code gives users a good response, for example, 200 indicates normal success, 201 indicates successful creation, 409 conflict, and 404 resource does not exist. Therefore, we are working on a node-based architecture. node is found in
\ nodejs \ myapp Directory
By default
I don't want to explain these files. I believe that anyone with development experience can understand them at a glance.
Copy node_modules to myapp
After the environment is set up, we will perform a demo test!
Create helloworld. js under myapp
var http = require("http");http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/pl
This article uses several examples to analyze how to use the require () function in node. js to load modules. It is very detailed. For more information, please refer to the detailed descriptions below and write them in comments. Here we will not be so embarrassed. Let's take a look at the details here. Please never comment it out as air.
The Code is as follows:
/* In
This article mainly introduces the definition of node. js, as well as a summary of the role of node. js, I hope you learn more, let's come and see this article
First, let's look at what node. js can do.
This is node's more formal
In short, the main content of this article is to use CC ++ to implement Node. js modules are very good. If you need them, you can refer to a pitfall N long ago-use Node. js to refactor NBUT's Online Judge, including the evaluation end. (Don't worry about when it's done. (/‵ Д ′)/~ Zookeeper
In short, what we need to d
This article mainly introduces node. in js, You Can format numbers to add thousands of characters. This article provides three implementation methods and provides the instance Code respectively. For more information, see the processing method separated by commas (,).
Regular Expression mode:
The Code is as follows:
"15000000 ". split (""). reverse (). join (""). replace (/(\ d {3})/g, "$1 ,"). split ("").
This article mainly introduces node. buffer in js. the usage of the copy method. This article introduces the buffer. copy method description, syntax, receive parameters, use instances, and implement Source Code. For more information, see
Method description:
Replace the buffer.
Copy data from the source buffer and replace it with the specified location of the target buffer.
Syntax:
The Code is as f
This article mainly describes how to use the path. dirname method in node. js. This article describes the method description, syntax, usage examples, and source code implementation of path. dirname. For more information, see
Method description:
Returns the path directory. Similar to UNIX directory commands.
Syntax:
The Code is as follows:
Path. dirname (p)
Because this method belongs to the path module,
This article describes how to use the path. isAbsolute method in node. js. This article describes the method description, syntax, examples, and source code implementation of path. isAbsolute. For more information, see
Method description:
Checks whether the path is an absolute path. An absolute path will be resolved to the same location, whether in the working directory or not.
Syntax:
The Code is as foll
This article mainly introduces Custom Event instances in node. js. A simple example. For more information, see the EventEmitter that inherits events, then you can register the event through the on; emit triggers the event and removeListener removes the event. A simple example is as follows:
Var util = require ('util'); var Et = require ('events '). eventEmitter; function Ticker () {var self = this; s
Analysis of Memory leakage in Node. js, analysis of node. js
This article is the first article in the Node. JS Holiday Season series by Mozilla's Identity team. The team released the first beta version of Persona last month. When
Get started with Node. js development-access the external world with http and access with node. js
Node. jsHttp ModuleYou can not only build servers, but also access other servers as client class libraries. The key lies in two methods:
Http. request (options [, callback])
= redis.createClient(); client.on('error', function (err) { console.log('Error ' + err);}); client.on('connect', runSample); function runSample() { // Set a value with an expiration client.set('string key', 'Hello World', redis.print); // Expire in 3 seconds client.expire('string key', 3); // This timer is only to demo the TTL // Runs every second until the timeout // occurs on the value var myTimer = setInterval(function() { client.get(
Build a simple Chat program using node. JS and Socket.ioCreate a folder under the node. JS root Chat, add two files inside: App.js and index.htmlApp.jsvarFS = require ('FS'), HTTP= Require ('http'), Socketio= Require ('Socket.io'); varServer =Http.createserver (function (req, res) {Res.writehead ( $, {'Content-type':'t
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