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This article mainly wants to record some problems I have encountered in learning the responsive principle in vue. If there are mistakes, please correct them!1. What are watcher, Dep and Observer respectively responsible for?Observer is responsible for recursive data and all sub data through object Defineproperty defines getters / setters for pr ...

prefaceIn the previous section, we learned how to set styles for custom components. At that time, we set the styles of custom labels in the main DOM:<style> my-card { display: block; margin: 20px; width: 200px; height: 200px; border: 3px solid #000; } </style> <my-card></my-ca ...

Welcome to my official account, "front-end wall". 1, Environmental preparation axios version v0 twenty-four Through github1s web page, you can see axios - dispatchRequest.js source code clone to local is required for debugging git clone https://github.com/axios/axios.git cd axios npm start http://localhost:3000/ 2, Funct ...

I've come to the responsibility chain mode. My guest, listen to my nonsense What is the responsibility chain model Responsibility chain model is a design model. In the responsibility chain model, many objects are connected by each object's reference to its next family to form a chain. Requests are passed along the chain until an object i ...

TypeScript -- basics Write in front: This article is a little long, which is suitable for Xiaobai who is going to learn TS. if there is a certain basic God, you can ignore this article. The article is not completely original. Most of the content is moved from other articles on the Internet, and then add some of your own understanding and su ...

In the previous section, we introduced the life cycle functions and customization methods in low code. In this section, we introduce the page Jump in low code. Page Jump It is relatively simple to realize page Jump in low code. Directly add behavior to the component and call the jump method of the platform. Open the application editor, select ...

reactive & ref reactive method Receive the parameter value and return a responsive Proxy object, that is, a responsive copy of the parameter valueParameter value: reference type dataAdvantages: even if only part of the data of the reference type is modified, eg: the data of the page will change when a property of the object / an item ...

prefaceThrough the previous study, we have a certain understanding of the relevant concepts and knowledge points of custom components. Today, let's learn several methods to set styles for custom elements and their sub elements.Add styles directly to custom labelsindex.html: <style> my-card{ display: block; margin: 20px ...

1. Registration event (binding event) ① Overview Adding an event to an element is called a registration event or a binding event. There are two ways to register events: traditional method and method listening registration method Traditional registration method: Use the event onclick starting with on <button οnclick="alert('hi~')">< ...

I What is an onion model? Look first 🌰 const Koa = require('koa'); const app = new Koa(); const PORT = 3000; // #1 app.use(async (ctx, next)=>{ console.log(1) await next(); //Pause the current program console.log(1) }); // #2 app.use(async (ctx, next) => { console.log(2) await next(); console.log(2) }) app.us ...