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catalogue 1, Implementation principle 2, Define an array for storing picture URL s 3, Set start button action event 1. Set click listening 2. Set start button failure 3. Define cycle timer 4. Toggle src attribute of small photo frame 4, Set end button action event 1. Set the listening function for the end button 2. Set stop button fai ...

Release an npm package and build your own third-party library preface When Xiaosheng needs to release his npm package, he can't meet his needs by seeing many online tutorials; Either it's too simple or it's short of three or four. Therefore, go to GitHub of major manufacturers and read its source code patiently before you have experience; I h ...

Link: Document address. 1. Get to know Redux 1.1 JavaScript pure functions In functional programming, there is a concept called pure function. JavaScript conforms to the paradigm of functional programming, so there is also the concept of pure function; In React, the concept of pure function is very important, and it is also very important i ...

History function Objective: to realize the function of searching history Initialize history data data () { return { // Search keywords q: '', // Historical keywords history: JSON.parse(localStorage.getItem('keywords') || '[]') } }, The history is displayed only when there is data <div class= ...

1. Get to know node js 1. What is a node js Node.js is a JavaScript running environment based on Chrome V8 engine. Node.js official website address: https://nodejs.org/zh-cn/ .2. Node. JavaScript running environment in JS .3. Node. What can JS do        Node. As a JavaScript running environment, JS only prov ...

1, Grid layout overview First, Grid layout and Flex layout With certain similarity, you can specify the location of multiple items in the container. However, the Grid layout is far more powerful than the Flex layout! Flex layout is a grid layout. You can only specify the location of the "project" for the grid. It can be regarded as a ...

Variable declaration Variable declaration Let and const are relatively new variable declarations in JavaScript. As we mentioned before, let is similar to var in many aspects, but it can help you avoid some common problems in JavaScript. Const is an enhancement to let, which can prevent the re assignment of a variable. Because TypeScript ...

Reflow and Repaint At the beginning, let's review the basic knowledge of reflow and redrawing introduced in the previous section (skip students, please consciously go back to the previous section to supplement → → →). Reflow: when our modification of DOM causes changes in the geometric dimensions of DOM (such as modifying the wi ...

📋 Personal profile 💖 About the author: Hello, I'm Daniel 😜📝 Personal homepage: Hall owner a Niu🔥🎉 Support me: like 👍+ Collection ⭐ Email + message 📝📣 Series column: web development🍁💬 Maxim: so far, all life is written with failure, but it doesn't prevent me from moving forward! 🔥 🍒 preface Today, I'd like to summari ...

Life cycle of vue The process of vue instance from creation to destruction is the life cycle. vue each component is independent, and each component has its own life cycle. Life cycle makes it easier for us to form better logic when controlling the whole vue. It can be divided into three stages: Mount stage, update stage and destroy stage. ...