node js cluster module

The Socket.io module is a node. JS-based project that works primarily to apply the WebSocket protocol to all browsers. The module is mainly used in real-time long-connected multi-request projects, such as online games, real-time chat, real-time stock view, QR code scan login and so on. --node.js Development Real-combat

 Global object;Frequently used tools;Failover event mechanism;Token file system access; HTTP server and client. Variables defined by the parent layer;Attributes of the global object;Implicit variables (undefined variables with direct values ).When you define a global variable, this variable also becomes the attribute of the global object, and vice versa. Note that in Node. js, you cannot define variables

Encapsulate ReadFile as a method (to solve asynchronous Problems)Cause: because Node. JS is non-blocking i/o, It is asynchronous, the read file is an I/O request, so it is thrown, and all NON-I/O requests are completed before they are madeCode with Async problem:var fs = require ("fs"); function fnreadfile (file) { function(err, data) { return data; }); Console.log (fnreadfile ("hei.txt")); //

Download two module packages firstSession Module Package: Used to keep the login status or to maintain session state, etc.Install express-session--save-devCookie Module Package: Used to parse cookies.Install Cookie-parser--save-devThis is then configured in App.js (which I mentioned in the configuration of node.

Child_process is a more important module for node, which enables the creation of multi-threading to take advantage of multicore CPUs.This module provides four functions for creating child processes.Spawn, exec, execfile, fork.Spawn is the most primitive function to create a subprocess, and the remaining three is a different encapsulation of the function.Spawn doe

NpmNPM, as a package manager for node. JS, is a frequently used tool.Note: To install a framework globally, you need to add the parameter-GNPM Install-g ExpressAfter installationYou only need to import the package in the projectvar http = require (' http ');DebuggingThe simplest way to debug node is Console.log (), but sometimes it takes one step to debug W

Node. js ------ Stream module1. The analysis stream at the beginning is an abstract interface implemented by many objects in Node. For example, a request to an HTTP server is a stream, and stdout is also a stream. Stream is readable, writable, or both. Stream was first introduced from the early unix era. Decades of practice have proved that Stream can easily deve

A file is a moduleExports public interfaceCreate Exports.jsTwo common interfaces available externally: Set value, squarevar i;exports.set = function (num) {//Set value i=num; Console.log ("Seti to" +i); Exports.square = function () {//squared and output I=math.pow (i,2); Console.log ("i^2=" +i);Require Get External interfaceCreate Require.jsvar square =require ("./exports");//Load Module Square.set (5); Square.square ()

//three members of the current module//1: ConstantConst PI = 3.14;//2: Two methods//Calculate AreafunctionGetSize (r) {returnPI * R *R;}//Calculate PerimeterfunctionGetperimeter (r) {returnPI * R * 2;}//Export the internal members of the current module for use by other modules//exports.size = getsize;//exports.perimeter = getperimeter;//exporting the current module