node js error class

saveTo: '/Users/Fay/Pictures/me2sex', // maximum downLimit: 5 ,}, Posts: [],/*** start download (program entry function) */start: function () {var self = this; var async = node. async; async. waterfall ([self. wrapTask (self. sitemapXML), self. wrapTask (self. sitemapJSON), self. wrapTask (self. downAllImages),], function (err, result) {if (err) {console. log ('error: % s', err. message);} else {console. l

This article is about the 4 great advantages of node. js and the choice of node. js Four point reason, are the benefits of node. js, of course, there are certainly bad places, the article also describes the five shortcomings of

Notes from the node. JS Development Guide ByvoidChapter 1th Introduction to Node. jsnode. JS is a development platform that allows JavaScript to run on the server, making JavaScript a world-class citizen of the scripting language and serving PHP, Python, Perl, and Ruby on an

server end of websocket, to push messages to the front end of spring MVC Framework in java, Use node. js to install the WebSocket Library:Npm install ws and then create the server:Var WebSocketServer = require ('ws '). server, wss = new WebSocketServer ({port: 8080}); wss. on ('connection', function (ws) {ws. on ('message', function (message) {console. log ('stored ed: % s', message) ;}); ws. send ('someth

a sync synchronization operation, you must capture the exception, and node. JS does not recommend a synchronous operationTry{Fs.renamesync (Files.upload.path,' Tmp/test.png '); }Catch(e) {Console. log (e); } response.writehead ( $, {"Content-type":"Text/html"}); Response.Write (' '); Response.End (); });}functionDisplay (response) {Console. log ("Handler ' display ' was called"); Fs.readfile ("Tmp/te

write the class name and ID name after the label name. For example: Div # content p. lead. center | Pandora_galen # side-bar.pull-right // no label name, the default is "div" span. contact. span4 a (href = "/contact" rel = "external nofollow" rel = "external nofollow") contact me HTML for rendering output: 6. Text Use the '|' symbol to output the original text. Div | I started learning front-end two years ago. | in the meantime, I learned html, jQue

Section Create a folder, such as myapp. After npm init is in it, the node_modules dependent folder will also be created. Use npm install -- save to install the following dependencies: 1. express 2. mysql 3. body-parser (used to parse the post parameter) Because express does not seem to have its own database encapsulation, it generally creates a new models folder and then writes the database logic. If you just want to perform a simple test, you can directly write it in app.

= reqOptions. url var urlObj = url. parse (reqUrl) var options = {hostname: urlObj. hostname, port: urlObj. port, path: urlObj. pathname, headers: reqOptions. headers | |{}} var req = http. request (options, function (res) {var events es = [] var err = null var statusCode = res. statusCode var headers = res. headers var ws = fs. createWriteStream (filepath, fileOptions) ws. on ('error', function (e) {console. log ('ws

Details about the Async and Await functions in Node. js, node. jsasync In this article, you will learn how to use the async function (async/await) in Node. js to simplify callback or Promise. Asynchronous language structure already exists in other languages, such as c #'s as

subscript without using the array subscript to manipulate all the satisfied node objects. The performance of getElementById is better compared to using document.queryselector, so using the latter can improve performance when selecting nodes is relatively straightforward (finding nodes faster). 2. Use comparison of jquery and native JS node objects//jque

);Console.log (' HEADERS: ' + json.stringfy (res.headers));Res.setencoding (' UTF8 ');Res.on (' Data ', function (chunk) {Console.log (' BODY: ' + chunk);});});Req.on (' Error ', function (e) {Console.log (' Problem with request: ' + e.message);});Write data to request bodyReq.write (' data\n ');Req.write (' data2\n ');Req.end ();Note: If you add more than 10 listeners to an event, you get a warning because the designer thinks that too many listeners

Detailed description of Node. js Streams file read and write operations, node. jsstreams Node. js is inherently asynchronous and event-driven, and is very suitable for processing I/O-related tasks. If you are dealing with I/O-related operations in the application, you can us

A Simple Method for reading and writing Redis databases in Node. js applications, node. jsredis Before starting this article, make sure that you have installed Redis, Node. js, and Node. js