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1. Introduction The core of HTML is its defined tags and elements. Tags mainly include three parts: Tag keywords. For example: p, h1, img, etc.The semantics expressed by the tag. For example, p label represents paragraph, h1 label represents primary title, etc.Common attributes and attribute values of tags. For example, the align attribute ...

catalog: 1,new Promise() 2,.then()And chain call 3,.resolve()and.reject() 4,.all()and.race() Before tearing Promise by hand, we have to understand the characteristics of Promise.First of all, Promise is essentially a constructor, which can create Promise object instances to meet the requirements of asynchronous programming.The Promise features ...

[Vue3] new Vue3 status management tool: Pinia New Vue3 status management tool: Pinia Vue3 has been released for some time. It adopts a new responsive system and builds a new Composition API. The surrounding ecology of Vue is stepping up the adaptation of this new system, and the official state management library Vuex is also being adapted. Th ...

VUE Foundation 1. What is vue? At present, the front-end has three very popular frameworks, namely angularjs, reactjs and vuejs. Among the three, vuejs has the highest popularity at present, and the one who developed vuejs is you Yuxi, a Chinese. Association with other frameworks Learn from angular's template and data binding technologyLear ...

There are many methods of array de duplication. Next, let's talk about several common methods: 1, includes method + for loop The includes() method is used to determine whether an array contains a specified value. According to the situation, if it does, it returns ， true; otherwise, ， false const array = [1,2,3,2,4,6,3,1, undefined, Na ...

There is no problem logging in different accounts with the same browser, but there may be major problems. The second login will overwrite the token of the first login, resulting in the second login user operating some data of the first login. Here is a solution. 1. Log in to account A in the login window, and then copy the same url to log in t ...

preface Since the official introduction of hook by react, many partners have changed from the old class component to hook component. However, there are still some differences between hook component and class component, so the following summarizes four parameter transmission methods 1, Father to son The child component receives the dat ...

[reference course] dark horse programmer pink teacher's front-end introductory course, h5(html5)+css3 + Mobile front-end video course for zero Foundation: b station course link Course materials: materials and source code: Download link [PPT] link: https://pan.baidu.com/s/1jm1LUuk5NIM-PPhmAbjEkg Extraction code: sp39 Related materials: W3C-CSS ...

In the React component, we will execute the method in useEffect() and return a function to eliminate its side effects. The following is a scenario in our business. This custom Hooks is used to call the interface to update data every 2s.import { useState, useEffect } from 'react'; export function useFetchDataInterval(fetchData) { const [list, ...

ES2015(ES6) ES2015 is the sixth version of ECMA Script(JS) released in 2015, so it is also called ES6. Since then, ECMA Script has released a large version every year and added some important features, which we call ES6 +. This paper mainly summarizes the main features of ES2015-ES2019. A learning front-end children's shoe should be some comm ...