node js modules tutorial

application into multiple modules to improve the reusability of the code.　　1. How do I use the module?The use of modules in node is very convenient, and in JavaScript code you can directly use the global function require () to load a module.In just "Hello world" example, require ("http") can load the System preset HTTP module; The module name begins with "./", a

code test (Rpel command action), just as you would write code tests in the browser's console.4. Node module　　built-in modules (node environment is inherently provided): http (createserver ...), FS (Writefilesync, readfilesync), url ...　　Custom Modules : our own defined modulesIn the

and writing the database. Therefore, for javascript, it is best to use the callback function. Who will accept this callback? A server object! The Code is as follows: Var http = require ("http ");Http. createServer (function (request, response ){Response. writeHead (200, {"Content-Type": "text/plain "});Response. write ("Hello node. js? 6.1.3 ");Response. end ();}). Listen (8888 );

General development We all use thinkphp+bootstrap+jquery and so on. node. JS is generally responsible for what, read some information on the Internet, generally understand. But who can talk about specific applications. He appeared to solve the problems of the past? What convenience can I use him to bring me? Thanks Excuse the novice. Reply content: General development We all use thinkphp+bootstrap+jque

-time responsibility for Node development. In July 2011, Node launched the Windows Edition with Microsoft's support At the end of January 2012, Ryan Dahl turned his head to Isaac Z.schlueter and turned to some research projects. In December 2014, many of the heavyweight node developers were dissatisfied with Joyent's management of

. get ('/', function (req, res) {res. send ('hello, this is our first nodejs Project');}); app. listen (0, 8080 ); 3.3 run the index. js File node index.js 3.4 access through a browser Enter the following address in the browser to access the web site we just set up. 127.0.0.1: 8080 4. Use Webstorm to build a Node. js w

refers to a Non-core module and is not a path-type identifier. It is a special kind of file module, which may be a file or package form. This type of module lookup is the most time-consuming and the slowest in all ways.2). File positioningFrom the optimization strategy of cache loading, the process of path analysis, file location and compile execution is not needed in two times, which greatly improves the efficiency of loading modules again. However,

Notes from the node. JS Development Guide ByvoidImplementation process: Https://github.com/ichenxiaodao/express-example5th chapter Web Development using node. jsZero-based implementation of a micro-blogging system with node. js, including routing control, page templates, dat

call when the main thread loops back to the event. This process is called the event loop , as shown in:This diagram is the whole node. JS operating principle, from left to right, top to bottom, node. js is divided into four layers, the application layer , theV8 engine layer , theNode API layer , and the libuv layer,

say that the backend does not involve database operations? This is not worth mentioning in comparison with the frontend DOM compatibility. What other folder and file operations do you think of as a special array operation. So you can be angry! Okay, let's get some substantive content. Node. js is originally an http server and needs to interact with the front-end. Therefore, there are two objects: request a

in the Node kernel: The Event listener in http. ClientRequest was not released. (The patch that finally fixes this problem has only two but crucial letters ). This painful experience prompted Lloyd to write a tool that can help find memory leaks. Memory Leak locating Tool There are already many easy-to-use and constantly enhanced tools to locate the memory leakage of Node.

Crawl target: That's my own blog: http://www.cnblogs.com/ghostwu/Features that need to be implemented:Crawl Blog All article title, hyperlinks, article summaries, release timeLibraries that need to be used:node. js comes with the HTTP libraryThird party libraries: Cheerio, this library is used to handle the DOM node, his usage is almost identical to jquery usage, so with this tool, writing a crawler is very

. JS:201 ThrowE//Process.nexttick error, or ' Error ' event on first tick^Error:uncaught, unspecified'Error' Event. At Eventemitter.emit (events.js: -: the) at Object.5:9) at Module._compile (module.js:441: -) at Object. JS (module.js:459:Ten) at Module.load (module.js:348: to) at Function._load (module.js:308: A) at Array.0(Module.js:479:Ten) at Eventemitter._tickcallback (

The examples in the previous tutorial can be separated from the nodejs directory dependency, that is, they can be executed at any location. The examples and compiling environments in this section must be placed under the nodejs directory, this is because the path is involved. To install an external module, we first need to install an external module, which is FelixGei... SyntaxHighlighter. all (); The examples in the previous

Stream is a very important module in node. js and is widely used. A stream is a readable, writable, or both readable and writable interface through which we can interact with disk files, sockets, HTTP requests, and enable the ability to move data from one place to another.All streams implement Eventemitter interfaces and have the ability to transmit events to feed the state of the stream. For example, when

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