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In our large screen visualization project, we often use a variety of charts. Compared with the traditional table display and boring text description, the chart display makes the user look more intuitive and the data display more clear at a glance. Based on svg drawing technology and front-end technology stack vue, this paper briefly expounds so ...

The article was first published on personal blog Small gray spaceOption merge policy analysisAfter converting the three options of projects input directive into a unified format, you can start to merge the options. Take a look at the code of option merging// core/instance/init.js // Start merge option const options = {} let key for (key in pare ...

Because of Xiaobian's marriage and family affairs. I stopped updating for a long time. Today, Xiaobian came back again. Today, let's take you to learn about Vue Use of watch listening events in JS. Usage of handler and immediate <div> <h2>It's a fine day today{{info}}</h2> <button @click="isHot = !isHot">Po ...

Component: a reusable Vue instance with a name and accepts the same option objects, such as data, computed, watch, methods, and life cycle hooks. The only exception is options specific to root instances like el. Function: components can be reused any number of times. Each component maintains itself independently. Because every time a compone ...

summary In typical OOP languages (such as java), the concept of class exists. Class is the template of object, but the concept of class was not introduced into JS before ES6 (ECMAscript6.0 released in 2015) Before that, objects were not created based on classes, but used a special function called constructor to define objects and their cha ...

In version 17.0.1, React has modified the life cycle of components. The new life cycle and the old life cycle have not changed much. The new life cycle has added two new hook functions, and three hook functions are outdated.   1, Old life cycle The life cycle of components can be divided into three stages: initialization stage, update st ...

prefaceLast year, I came up with an idea to extract the theme color of the picture, cooperate with the picture to have an immersive visual effect, and produce a harmonious and consistent feeling. It dawdled until this year to start development~ It took a week to realize this function in two ways: client and server. The two methods have their ow ...

preface: The project needs to write a K-line diagram. The charts of echarts can't realize the functions inside, so it's really a headache to use TradingView. Baidu has few things, and it took a long time to realize them. design sketch: The k-line is updated in real time and can jump normally according to the data index.html introduces js and ...

TypeScript learning notes TypeScript overview and environment Install the toolkit typescript for parsing TSInstall the TS node toolkit to simplify TS executionEntry codeNotes in TS JS original type numberstringbooleanundefinednullobject Object type basic usageFunction writing in object type arrayfunction Definition of function ...

preface js notes, a good memory is not as good as a bad pen. It summarizes some commonly used knowledge points. Send it to csdn as a backup. The previous ones are relatively simple, so I didn't write them. I only wrote some knowledge points that I think are easy to forget. If there are mistakes, please give me some advice. JavaScript prefa ...