node js modules tutorial

propName or obj ['propname'> method to find the object attributes but fail to search for them. hasOwnProperty ('propname') is used to search for attributes in the prototype object. If the property does not exist in the prototype chain, the undefined value is returned. Let's use the following example to illustrate: if (typeof Object.create !== 'function') { Object.create = function (o) { var F = function () {}; F.prototype = o; return new F(); };var otherPerson = Object.create(person

The fourth chapter recommends 3 hours of study time 10 chaptersHow to learn: read it in detail and implement the relevant code manuallyLearning Goals : This tutorial will teach you to install node, build servers, Express, MySQL, MongoDB, write background business logic, write interfaces, and finally complete a complete project backstage, a total of 10 days is expected.node.

4.1 Core modules and file modules/574.2 Accessing members within modules from outside the module/584.2.1 using Exports object/584.2.2 defines a module as a class/584.2.3 Defining class variables or class functions for a module class/614.3 Organization and Management module/614.3.1 loading modules from the Node_modules

does not exist ');} Normal operation if (typeof foo = = ' undefined ') {console.log (' Foo does not exist ');}To detect COMMONJS we only need to check the module, exports, require whether it exists, such as:Commonjsif (typeof module!== ' undefined ' typeof module.exports!== ' undefined ') {module.exports = person;} Detecting browser environmentsThe browser environment also includes the introduction of the AMD framework, as well as the lack of modularity. For the former we should use the AMD fr

= True, because the last B module output is done=true AH;Then output A.done ; A module is finished running.To this, a, b two modules are loaded, in main although there is a reference to the B module, but will not be executed.And then the last thing we see is the output in Main, A.done=true, B.done=true. variantsWe change the statement of a, B module as follows:We removed two of the lines of the black line, and now what does the output turn out to be?

/');The second argument is set to true to indicate that the value of the query object is rendered as an objectUrl.parse (' Https://www.baidu.com:8080/list?from=scottcourse=node#floor1 ', true);Url.format ({protocol: ' https: ',Slashes:true,Auth:null,host: ' www.baidu.com:8080 ',port: ' 8080 ',hostname: ' www.baidu.com ',hash: ' #floor1 ',search: '? From=scottcourse=node ',query: ' From=scottcourse=

'; this.age = 10;}; Person.prototype = {sayname:function () {console.log (this.name);},sayage:function () {console.log (this.age);}}; Module.exports = Person;//index.jsvar person = require ('./person '), var person = new Person ();p erson.sayname (); Person.sayage ();If the module is a directory, the file that defines the module in the module directory must be named Index.js. Unless specifically indicated in this directory under a file called Package.json. To designate a file that supersedes In

Installation of 1.node.jsWindows platform:Windows X64:current version:v4.1.0 https://nodejs.org/en/Note: (The new. msi installer already contains NPM by default)2.node.js Modules installation (The following are common modules)Cli-color Https://www.npmjs.com/package/cli-colorinstallation command:npm install cli-colorEvents Https://www.npmjs.com/package/eventsinstallation command:NPM Install EventsExpress Htt

There are usually some modules that can be applied to both the front and back ends, but the JavaScript file is loaded into the script tag in the browser side, unlike node. js. node. JS is packaged to load into the final execution, so that the variables in each file are natur

COOMONJS modules provide a clean syntax for importing dependencies. This lesson would take a look at the basics of using CommonJS modules.App.jsvar dep = require ('./DEP'// exports a string backDep.jsModule.exports = "exports a stringback";You can exports anything, such as a function:App.jsvar dep = require ('./DEP'// Export a function backDep.jsfunction () { return "exports a function back";}Exprots multi-value:App.jsvar dep = require ('./dep '

This article will share with you the use of node. js is used to develop Weibo instances. After reading the nodejs Development guide, I found that many of the Code in the book is no longer available, because the express version has been upgraded, so today, I will try to develop Weibo instances and recommend them to you. I have been persistently engaged in front-end development before. In recent days, I start

This article analyzes and explains node through several examples. the use of require in js is very detailed. Here we recommend that you provide a very clear description in the code comments. Here we will not talk nonsense about it. We will provide the Code directly: The Code is as follows: /* In node, you can use the require () function to load

Through node-mysql Build Windows + Node. js + MySQL environment tutorial, node-mysqlnode.js Preface MySQL is a common open source database product and is usually the first choice for free databases. After checking the NPM list, I found that Nodejs has 13 databases to access

This is the third article in this series. The first two netizens have fed back a lot of messages. In addition, they have been busy for the last two days and have never had time to sort out the articles. It's a weekend, let's sort it out. In this article, we will talk about node. js module introduction and Materials Through Node. the official API of

This article mainly introduces the understanding and analysis of node. js event monitoring and triggering, and compares node. js and jQuery's practical skills on event monitoring in the form of examples, which helps to deepen the understanding of node.

step will go to github to download npm files and progress, and the fourth step is to install npm to node. js will copy several cmd files and the mode_modules folder to the nodejs directory. In this way, npm is configured. If you need to install any modules, enter npm install ***. If there is no npm or windows users can use github to download socket. io and put i

Use npm to publish the Node. JS package tutorial, and npm to publish the node. js tutorial Npm is the package manager of Node. JS. During

Global Object of basic Node. js tutorial, basic node. js tutorial Global Objects in basic Node. js tutorials In browser JavaScript, windo

In this article, I will share my personal information on node. I hope to help you understand and understand js. node. javascript on the server side, which allows javascript code to run on the backend (out of the browser environment. 2. event-driven, asynchronous I/O programming mode (single thread) is its core. 3. node