= ""; Does not match the following routing rule, only matches the URL get request if (Url.match (/\. Png|jpe?g|gif|js|css|html|ico)) {return next (); } HTML = await Reactroute (). catch (E = = {//do error handle return false; }); if (HTML) {return res.send (HTML); }//Other route processing rules ... return next ();}) Async function Reactroute () {return new Promise ((Resolve, reject) +//Can be filtered for a non-
state of the thread and restores its control over the CPU to continue execution. This I/O pattern is the usual synchronous I/O (synchronous I/O).
asynchronous I/O: When a thread encounters an I/O operation, it does not block the completion of the I/O operation or the return of the data, but simply sends the I/O request to the operating system and proceeds to the next statement. When the operating system completes an I/O operation, the thread that notifies the I/O operation as an event
), logic and its complexity (state and content correspond) 0.3 react historyReact, created by Facebook's engineer, Jordan Walke, was affected by the PHP HTML component library XHP, react in 11 when it was first deployed on Facebook newsfeed;Then deployed on Instagram in 12 and announced open source in jsconf us in May 1314 became Facebook's first open source project to reach 10,000 star on GitHub,
property to the Repolist component.If the Promise object is fetching data (pending state), the component displays "Loading", if the Promise object is error (rejected status), the component displays an error message, and if the Promise object fetches the data successfully (fulfilled state), The component displays the obtained data.
var repolist = React.createclass ({getinitialstate:function () {return {loading:true, error:null, data:null}; }, Componentdidmount () {This.props.promise.the
The previous chapter explains the two ways in which node. JS projects are created in Webstorm, and when the node. JS Project is created, the rest of it involves configuration setup work.To ensure the code completion feature of the node.
This article mainly introduces Nodejs simple getting started tutorial (3): process. This article describes the communication between Node processes and cluster modules, for more information, see Node. Although there are multiple threads, JavaScript running on v8 is single-threaded. The child_process module of Node is u
Preface using Nodejs to build a Web server is a comprehensive introductory tutorial for node. js, because to complete a simple Web server, you need to learn some of the more important modules in Nodejs, such as: HTTP protocol module, file system, URL parsing module, path parsing module, and the 301 redirect problem, let's talk a little bit about how to build a si
update, insert objnew,true is inserted , default is false, do not insert. A fourth parameter, The default is false, update only the first record found, if this parameter is true, the condition is checked out all the records are updated. Let's change a piece of data, the modifier uses the $setAfter running the following code, we find that the age in the data of name Zhangsan is modified to 50 (originally 25)Delete the data field, using the $unsetThe following code removes the Age property of the
Objective:This article describes the functions in node. js, which is a bit simpler than the previous one, and is actually the same as the function in our JavaScript .Well, no more nonsense, let's get to the point.
node. JS functions:"Example 1: Creating a basic parameter function" In JavaScript, we use function-
Objective:node. js Introduction, installation and configuration, the previous section has been introduced, if there is unclear can also leave a message or directly ask Niang.
This section:This section focuses on a simple example of node. js, using two methods. This is described below.In short, this section is very simple. Look down, everybody.
Script
Tags: Verify options note localhost crud pre type unique MonThis article focuses on installing the basic tutorial using Mongoose to let node. js operate MongoDB, front-end js+ back-end Node+js Operation MongoDB is the so-called mo
Because the new job to do front-end, as the front-end small white and can learn as soon as possible, so choose the web of node. JS's Introductory tutorial. Blogs only do their own records of learning.JavaScript lacks a module management mechanism, which is prone to variables being overwritten and methods being substituted (both contaminated). In particular, there are dependencies that are prone to errors. I
Lodash Type judge the source code"hungry Big front Node. JS advanced tutorial" address: Https://github.com/ElemeFE/node-interviewLodash Introduction : Lodash is currently a very popular JS tool library, It encapsulates a lot of JS
This article is an introduction to the nodejs tutorial series. It mainly describes the features of nodejs, the module mechanism CommonJs (module reference, module definition, Module Identification, module implementation), packages, and NPM, this is a very detailed article. Preface
If we don't want to learn nodeJs, we will get old... when the HTML5 waves hit us, many of our predecessors started the NodeJs journey, and at that time I was still working
1. First go to the official website to download the installation packagenode. JS Official website: https://nodejs.org/en/Download the corresponding installation package according to your operating systemThis post takes the Node-v4.4.5-x64.msi version as an example to introduce the installation tutorial.2. Installation Steps3. Check if installation is successful a
"Hungry big front node. JS Advanced Tutorial" Address: Https://github.com/ElemeFE/node-interview1. How to write a copy function of a JSON object
function Clone (obj) {
var result;
if (Array.isarray (obj)) {
result = [];
Obj.foreach (item) = {
Result.push (Clone (item));
});
} else i
page. */router.get(‘/‘, function(req, res, next) { res.render(‘index‘);});After packing with Webpack (or not packaging), introduce the relevant JS in the root HTML template, and then node uses the root path / to match the HTML template. That way, node won't report 404.2.2 When node returns 404, point to HTMLrouter.ge
First, NPM has built-inUse the online tutorial to install NPM always prompt version error, the latest version of the bugExecute the NPM-V, please.Oh, it's already installed.The latest version of node. JS has built-in NPM and does not need to be installed manuallysecond, Express command does not recognizeAfter you install Express, perform the express-v promptExpre
Construction of Node JS project:To create a standard file structure, you need to download and use the Webstorm software to create a new Node Express project.Operation of App.js:(1) Introduce a new module: var School_controller = require ('./controller/school_controller ');(2) Add a new route: App.use ('/school ', school_controller);Three ways to get parameters:(1
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