node js foreach loop

What Nodejs can use to do? A website with complex logic;? Large-scale WEB applications based on social networks;? Web Socket server;? TCP/UDP socket Application; 8? command-line tools;? Interactive terminal program;? A local application with a graphical user interface;? Unit testing tools;? Client-side JavaScript compilerasynchronous I/O and event-drivenThe biggest feature of node. JS is the asynchronous I/

In the above steps, the HTTP request is swept to the end of a closed loop including the request header information, The response time the server returned header information, status code, etc.These are available in the node HTTP module and have the appropriate interface to assemble the information and return them, while the HTTP interfaces are designed to support many features that support the HTTP protocolT

Node. js provides an asynchronous mechanism for calls to all external resources, and file IO is no exception. In this asynchronous mechanism, the process will not be blocked, which greatly improves the CPU utilization and lays the foundation for the single process mode. At the same time, the introduction of asynchronous mechanisms also brings some complexity to the implementation of program logic. Some conv

(event,listener); removing eventsError is a special event for EventemitterEncountered exception is the launch Error event, call the listener function, to avoid the program crashesvar events = require (' Events 'var emitter = newevents. Eventemitter (); Emitter.on (' error ',function() { console.log (' Error ')}) Emitter.emit (About inheritance: Most of the time we don't use eventemitter directly, but inherit it from the object. Including FS, NET, HTTP, as long as the core modules that support

Introduction and Materials Http://nodejs.org/api/events.html Http://www.infoq.com/cn/articles/tyq-nodejs-event Events is the most important module of node. js. The events module provides only one events. EventEmitter object. The core of EventEmitter is event launch and event listener. Most modules in Node. js are inher

Finding the node. JS documentation Today is a good explanation of how to use Process.nexttick.node. js Document Link Http://nodejs.org/api/process.html#process_process_nexttick_callbackProcess.nexttick (function callback () {});node. JS ensures that callback is called befor

, [callback])Request. setNoDelay ([noDelay])Request. setSocketKeepAlive ([enable], [initialDelay])Http. IncomingMessageEvent: 'close'Message. httpVersionMessage. headersMessage. rawHeadersMessage. trailersMessage. rawTrailersMessage. setTimeout (msecs, callback)Message. methodMessage. urlMessage. statusCodeMessage. socket Let's start with a simple example to create a file named server. js and write the following code: The Code is as follows: Var ht

, [callback])Request. setNoDelay ([noDelay])Request. setSocketKeepAlive ([enable], [initialDelay])Http. IncomingMessageEvent: 'close'Message. httpVersionMessage. headersMessage. rawHeadersMessage. trailersMessage. rawTrailersMessage. setTimeout (msecs, callback)Message. methodMessage. urlMessage. statusCodeMessage. socket Let's start with a simple example to create a file named server. js and write the following code: The code is as follows: Var ht

ObjectiveIn the Learning Network video and Cnode Novice access to the crawler, said is the crawler, in fact, did not use crawler-related third-party class library, mainly using the node. JS Basic module HTTP, Web analysis tools Cherrio. Use HTTP to get the URL path directly corresponding to the Web resource, and then use Cherrio analysis. Here I mainly put the network teaching video to provide the case of t

the content of the entry file.Var fileContent = fs. readFileSync (filePath );// Traverse the File ContentFileContent. forEach (function (value ){// Here, findImport is the method that you need to implement. use regular expressions to match dependencies.Var matchFile = findImport (value );If (matchFile ){// If the dependency is matchedIf (! LoadedFileList [matchFile]) {// If the dependency is not in the weight list, recursively call combine.Combine (m

node. js v6.6.0 (current) is released, and node. JS is a set of JavaScript toolkits for writing high-performance Web servers (Getting Started tutorial qkxue.net), as shown in this update:Notable changesCrypto:added crypto.timingsafeequal (). (Not-an-aardvark) #8304Events:made the "Max event listeners" memory leak warni

the next node* element name. nextSibling* 10. Get the next tag element* element name. nextelementsibling* 11. Get the parent element from the element* element name. parentnode;* 12. Parent element Node* element name. parentelement*//** Quick way to get element nodes* 1. Get the node document.forms for all forms;* 2. Get all the A-tag

module we see in the A.js code. After you create a, node places a in the cache and then loads the action on it. That is, if in the process of loading a, there is other code (assuming B) require a.js, then B can be taken directly from the cache to the module A, which will not cause a repeated loading of the dead loop. But the cost is that in the load process, B sees an incomplete a, which is why the front p

;(function(Win) {varOS = require (' OS '); varIfaces =os.networkinterfaces (); functionNetworkutil () {var_self = This; This. Getmac =function(family) {varMac = "; Object.keys (ifaces). ForEach (function(ifname) {Ifaces[ifname].foreach (function(iface) {if(Family!== iface.family | | iface.internal!==false) { return; } mac=Iface.mac; }); }); returnmac; }

1. What is the REPL operating environment: to make it easy for developers to test JavaScript code, an interactive runtime environment called REPL (Read-eval-print-loop) is provided.2. How to use: In the Command Line window, enter the "node" command and press ENTER to enter the REPL running environment.3. Declare the object and assign a value to the property:> User=new Object ();{}> user.name= ' Yjh ';' Yjh

, data) {if (err) {Console.log (Err.stack);Return}Console.log (Data.tostring ());});Console.log ("program execution Complete");The above program Fs.readfile () is an asynchronous function used to read the file. If an error occurs during the reading of the file, the error Err object will output an error message.If no error occurs, ReadFile skips the output of the Err object, and the contents of the file are output through the callback function.Execute the above code and execute the result as foll

Brief introductionthe biggest feature of node. JS is the asynchronous I/O and event-driven architecture design. for highly concurrent solutions, the traditional architecture is a multithreaded model that provides a system thread for each business logic module to compensate for the time overhead of synchronous I/O calls through system thread switching. node.

module (built-in module), for file operation,Can see whether it is a file or a directory,You can create a table of contents (this directory is an error),Write to file (does not exist this file is created, there is new content overwrite file content),Append files,Read the file (Fs.readfile reads the 16 binary, can speak the result ToString),Reads a directory (a directory or file is displayed),Rename (rename, cut file, parameter is two directory file),Delete directory (only directories can be del

Use node. js to create the website foreground background What can node. js do? I still don't know where he is widely used, and I have no chance to access such a project. Just because I like it, I made a website and background in my spare time. I deeply understand that if you like a technology, you can play with it, but

technology. I wonder if you have any knowledge about the "Reverse Proxy" in network services. One of the functions is to distribute ports. We may wish to use domain names for Route distribution: requests for AA.com domain names are distributed to port 82 of PHP for execution. Requests for BB.com domain names are distributed to port 83 of ASP for execution ;...... And so on. Of course, the port here is only described and used. You can configure it as needed. It is the request received from port