node js console log

provided by HTML5. It uses a "handshake" to implement communication between the client and the server. The real-time performance is good and the header carried is small. Currently, the supported browsers are as follows: Client JavaScript code: Var socket = io. connect ('2017. 0.0.1: 8181 '); // send data to the server socket. emit ('fromwebclient', jsonData); // receives data from the server socket. on ('pushtowebclient', function (data) {// do something .});

within our node. js app. Here's an example for finding documents within a collection specifically in this case to find all female users. // app.jsdb.users.find({sex: "female"}, function(err, users) { if( err || !users) console.log("No female users found"); else users.forEach( function(femaleUser) { console.log(femaleUser); } );}); Notice how our initial query is a near duplication of the correspondin

mode. Its objects include addListener, on, once, removeListener, removeAllListeners, emit, and other basic event listening modes. First, let's look at an example: Var events = require ("events"); var emitter = new events. eventEmitter (); // creates an object for the event listener // listens to the event some_eventemitter.on ("some_event", function () {console. log ("event triggered, call this callback f

If you're writing the node. JS code, Node-inspector is a must-have option, much better than node. JS's built-in debugger. It's similar to Chrome's JavaScript debugger.To install with NPM:$ npm install -g node-inspectorThen you need to connect to

){Callback (err, null );});} Task 3: Save rss to a file and return an error through callback. Copy codeThe Code is as follows:Var saveRss = function (data, callback ){Fs.writeFile('rss.txt ', data, 'utf8', function (err ){Callback (err );});} Integration: Copy codeThe Code is as follows:Getrssaddress('ssss.txt ', function (err, data ){If (err ){Console. log (err );Return;}GetRss (data, function (err, data

Promise/A specifications, when. js, is targeted at such problem domains. Let's take a look at the transformed code. Task 1: The Code is as follows: Var getRssAddress = function (path ){Var deferred = when. defer ();Fs. readFile (path, {encoding: 'utf8'}, function (err, data ){If (err) deferred. reject (err );Deferred. resolve (data );}); Return deferred. promise;} Task 2: The Code is as follows: Var getRss = function (url ){Var deferred = when

) {console. log (error);} else {console. log (result );} // Close the database link to db. close () ;}); // mongoose findvar criteria = {title: 'emtity _ demo_title '}; // query condition var fields = {title: 1, content: 1, time: 1}; // The Field var options ={}; mongooseModel. find (criteria, fields, options, function

1 //Create App.js page2 //One: page code3Console.log ("Log Information");4 //Execute (node app.js) in the page this file will see the log message in the console: "Log Information"5 //execute in another way: node App.js 1>info.txt

Module stability: 5-lockednode has a simple module loading mechanism. in node, files and modules are one-to-one. for example, foo. javascript loads the circle in the same folder. js module. foo. js content: [javascript] lt; SPANstyle quot; FONT -... Module) Stability: 5-locked Node has a simple module loading mechani

Here we will share with you node. examples of js operations on the mongoDB database, including connecting to the database, inserting data, closing the database, reading data, and inserting data, are very comprehensive. We recommend this to our partners. Connect to database The Code is as follows: Var mongo = require ("mongodb ");Var host = "localhost ";Var port = mongo. Connection. DEFAULT_PORT;Var serve

can edit and compile it in vs2013.Of course, you can also directly use the node-gyp build command to compile.The test js program is as follows: The Code is as follows:Var hello = require ('./hello ');Console. log (hello. hello ());Some problems were encountered, as shown below:1. C: \ Users \ Administrator.

This article mainly introduces Node. for details about js file operations, this article describes how to process file paths and how to use and introduce the fs module in detail. For details, refer to a set of data flow APIs on Node, it is convenient to process files like network streams, but it only allows sequential processing of files and does not allow random

This article mainly introduces node. the js entry-level instance helloworld describes node in detail. js simple output example helloworld implementation code and running method. If you need it, refer to the example in this article to describe node.

+ item ;}) ;}; str = str. replace (r2 ,''). replace (r4, '');/* asynchronously write to the target file */fs. appendFile (writePath, str, {encoding: 'utf8'}, function (err) {if (err) {throw err}; console. log ('complete ........ ');});}; Although the content is small, I still want to adapt to commomJS's modular programming, So I split the above module into ^ _ ^, file name: compress.

Detailed description of the use of require in node. js, node. jsrequire The descriptions in the code comments are very clear, so there is not much nonsense here. The code is provided directly: Copy codeThe Code is as follows:/* In node, you can use the require () function to load modules.* The require function uses a p

This article mainly introduces Node in Linux. the method for configuring MySQL or Oracle databases in js programs. By default, the Node environment has been assembled and we can use the npm package management tool for configuration. For more information, see Mysql usageInstall the mysql module: Run the command in the cmd command line of the installation root dire

properly, a build directory should be generated, and related files may be the vcxproj file of M $ Visual Studio, or Makefile, depending on the platform.BuildAfter Makefile is generated, we start to construct and compile:$ Node-gyp buildIt will be a real success when all compilation is complete! Check the build/Release directory. Is there a hello. node file below? That's right. This is the soap to be picked

installation ') See http://www.dbpoo.com/sublime-text2-theme-sod/ for details 7. After the installation is complete, restart Sublime and press the shortcut key Ctrl + Shift + P. Enter install, select Install Package, and press Enter. 8. Enter nodejs and select Nodejs for installation (JavaScript NodeJs Snippets can be installed) 9. Create the test. js file and ent

(String: NewFromUtf8 (isolate, "Hello World");} void Init (Local Exports) {NODE_SET_METHOD (exports, "foo", Foo);} NODE_MODULE (cpphello, Init )}(3) Compile ComponentsThe hello. node module is generated in the node-gyp worker Enode-gyp build./build/Release/directory.(4) Compile and test js CodeConst m = require ('./build/Release/hello')

file is index. js, and index. js will be loaded. If index. js does not exist, loading will fail. Assume that the directory structure is as follows: Package. json is defined as follows: Copy codeThe Code is as follows:{"Name": "pack ","Main": "modA. js"} At this time, require ('./folder') will return the modA.