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node. JS Learning note implementing flow control

() { var currenttask = Tasks.shift (); if (currenttask) { Currenttask (); } } Next (); OK, it's simple, let's look at parallelism again.Parallel Flow ControlThe following code assumes that we ran 10 parallel tasks: var taskcounter = 0; var tasksum = 10; function istaskcompleted () { if (++taskcounter = = tasksum) { Console.log (' All job done '); } } function Job () { Lots of code here Istaskcompleted (); } for (var i = 0;

node. JS Learning 02

eventsThe Request object contains all the contents of the user request message, and the request object can get all the data submitted by the user.The response object is used to correspond some data to the user and must use the response object when the server responds to the data to the clientRequest shorthand for REQ response to ResServer.on (' request ', function (req,res) {Send back a response to the browserRes.write (' Hello World ');For each request server must end the response, otherwise t

node. JS Learning Note 01 For beginners to build a static server

must be customized,functionsend404 (response) {Response.writehead ($, {"Content-type": "Text/html" }); Response.Write ("); Response.End ();}//send a file to the clientfunctionsendFile (response, FilePath, filecontents) {Response.writehead ($, {"Content-type": Mime.lookup (FilePath)}); Response.End (filecontents);}//This function is exported to the main module using thefunctionservestatic (response, Abspath) {if(Cache[abspath]) {sendFile (response, Abspath, Cache[abspath]); } Else{fs.exists (Abs

JS Learning Summary----node and Relationship properties in the DOM

= 0;i){ varCur =Nodes[i]; if(cur.nodetype===1){if (tagName) {if (cur.nodename.tolowercase===tagname.tolowercase) {Ary.push (cur)} }else{Ary.push (cur);}}}return ary; } Gets the previous sibling element child node of an element function prev (ele) {var pre = ele.previoussibling; while (Pre pre.nodetype!==1) { = pre.previoussibling; }return pre;}Gets an element of all the brother element no

The react of node. JS Learning Notes

the State or property of the react, which requires binding this.Summary:Properties provided by react:Getinitialstate Setting the default stateSetState Modify StateRender return ComponentComponentwillmount () called before inserting the real DOMComponentdidmount () called after inserting the real DOMComponentwillupdate (Object Nextprops, Object nextstate) is called before re-renderingComponentdidupdate (Object Prevprops, Object prevstate) is called after re-renderingComponentwillunmount () calle

node. JS Learning Notes (i) Module.exports and exports

In node. js, the module corresponds to the file one by one, which means that a node. js file is a module. To export a function as a method of a module:var printname=function(name) { console.log (name);}; Exports.printname=printname;The module is then requested in the Index.js file, using the method of the module

node. JS API Learning Note (i)

lable end. Output lable:100ms (can calculate intermediate processing time) console.timeend (' lable '); Prints information about the current stack lable. Output trace:lable---------------------- console.trace (' lable '); Assertion syntax: Console.assert (Expression,[message]) //output assertionerror: Abnormal Console.assert (false, ' abnormal slightly ');V. BufferThe appearance of this buffer is basically to solve the situation that JS

Node. JS Introductory Learning Note (iii)

has started.");Note: where ONrequest (the callback function we define) is triggered, a text message is output using Console.log (). After the HTTP server has started working, a text is also output.When we run node server.js as usual, it will immediately output "server has started." On the command line. When we make a request to the server (Access htt://localhost:8888 in the browser), the "Request received" appears on the command line.This is the even

Instructions used in the "node. JS Learning Note Eight" Package.json file

" Repository Repository type and location of package "Repository": {"Type": "Git","Location": "Http://xxx.com/c.git"} Keywords Keywords that appear in NPM search "keywords": ["AAA", "BBB"] Dependencice This module relies on modules and versions that you can use * and X wildcard characters "Dependencies": {"Express": "Latest","Connect": "2.x.x","Cookies": "*"} Engies The version of

node. JS Learning Note (1)/9.26

node. JS Core Modules:1.NODEJS global variable is globals, not window2.process Process Object3.console.log () Console outputBuilt-in Modules1.util//function is unknown, seemingly inherited sub,base these two classes of(. Eg) 1 util.inherits (Sub, Base);2.events//function unknown3.fs//file stream?(. Eg)1 var fs = require ("FS"2 fs.readfile ("file.txt", "Utf-8", readfilecallback);4.HTTP Server and Clienthttp

"Node. JS Learning"--(4)--express4.x framework

);/*** Create an HTTP server instance*/Varserver = Http.createserver (APP);/*** Start the Network Service listening port*/Server.listen (port);Server.on (' Error ', onError);Server.on (' Listening ', onlistening);/*** Port Normalization function*/Functionnormalizeport (val) {var port = parseint (val, 10);if (IsNaN (port)) {return Val;}if (port >= 0) {return port;}return false;}/*** HTTP Exception event handler function*/Functiononerror (Error) {if (Error.syscall!== ' listen ') {Throw error;}var

RABBITMQ Learning: (12) using RABBITMQ in the node. JS Environment

(); })(); This is an echo client, which comes in, prints out, and waits silently for the next message. If the message is quit, then graceful exit ~Where the code creates a persistent queue:moneyqueue, the queue is automatically bound to the default Exchange, which is provided by RMQ, so it's persistent, so there's no problem.Because this is just a consumer, unable to work alone, to verify, you can send messages through the RMQ Administration page.http://blog.csdn.net/puncha/article/details/8

JS to the end: node Learning 9

Node. JS Database Chapter--mongoose ODM Introduction MongooseAlmost all languages have a native database connection driver, this we have learned on the last time, such as Java Jdbc,mysql-connector, but the actual development in order to pursue efficiency will not use the original connection, not always establish a connection, the last one, Our registration and landing each write a connection operation, at l

"Cicada Hall Learning Notes"--on the understanding and simple establishment of node. JS Access database Connection Pool---@wan <

pool at the beginning of the program Request to come in and return data to the request by connecting the pools response The request is complete and the connection is returned to the connection pool Disconnect frees resources when exiting a program Using connection pooling can help us better manage database connections Here we have the connection pool code for database creation as follows: Const dbpool={ //Configuration Database config: {host:"Host Name", Port:"Port number", User:"Databas

Jong Communication API learning process and RESTAPI node. js Package

) {callback functionConsole.log (body)})Results:{statusCode: ' 000000 ',Subaccount:{subaccountsid: ' cdxxxxxxxxxxxxxx90 ',Voipaccount: ' 8xxxxxxxx7 ',dateCreated: ' 2014-06-01 12:40:06 ',Voippwd: ' HXXXXV ',Subtoken: ' 0xxxxxxxxxxxxxxxa '}}Done!The next interfaces are similar, so it's easy. But try to IVR-related interface, but always error, has been unknown so, until the discovery of the IVR document does not have JSON corresponding format description, this thought: I le go, IVR interface does

Use of the "node. JS Learning II" NPM

NPM is a package management tool that is installed with node. js to address many of the problems with Nodejs code deployment, with the following common usage scenarios:Allow users to download third-party packages written by others from the NPM server to local useAllow users to download and install command-line programs written by others from the NPM server to local useAllows users to upload their own packag

Node. js learning: Using express to build a simple web Calculator

Node. js learning: Using express to build a simple web Calculator Node. js learning: Using express to build a simple web Calculator Blog link:Http://blog.csdn.net/jdh99, Author: jdh, reprinted please note. Environment: HOST: WI

node. JS Learning Note (6)--Create a project with Express

complete process of request, routing, and Response.We found in the App.js file inside and App.get ('/', route.index); similar to another routing rule: App.get ('/users ', user.list); As with the previous routing rule, we can tell that This rule means that when we visit Localhost:3000/users, the browser will return the User.list file under the Routes folder through the daemon and return it to the browser results. Sure enough, the browser does pass through this file: Res.send ("respond with a res

JS to the end: node Learning NOTE 2

("'); Console.Log(' files: '+F.length); F.ForEach(function(FN){ Console.Log("---"+fn; }); })}Else{ FS.ReadFile(dir+'/'+File,"UTF8",function(Err,Data{ Console.Log(" "+Dir; Console.Log("\033[90m]+Data+"\033[39m]); }); } } });}effect :Code Analysis:The whole small program code is very simple, compared to the C languag

Js deep learning-Object

Js deep learning-Object Many articles have introduced that JavaScript is a programming language. Since object-oriented programming must have objects, what are the differences between JS objects and object definitions in other object-oriented programming languages. 1.C #The object is a class instance. An int type variab

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