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CSS brief introduction p { color:red; text-align:center; } Do not leave spaces between attribute values and units CSS comments start with / * and end with / id selector #para1 { text-align:center; color:red; } id and class should not start with numbers class selector .center {text-align:center;} Specifies tha ...

Problem background Today, we need to do a function of clicking icon to slide to the article comment area, using scrollIntoView. It is found that the mobile terminal occasionally fails. The code is as follows: commentRef.current.scrollIntoView({ behavior: 'smooth', }); analysis Think about whether 1 is caused by a browser bug accor ...

Learning video station B: Dark horse programmer - front end learning (phase I) CSS advanced Advanced of selector compound selector Descendant selector: spaces Function: select the qualified elements in the descendants of parent elements according to the nesting relationship of HTML tags Selector syntax: selector 1 selector 2 {CSS} res ...

Source code link: https://pan.baidu.com/s/1cDehMieTufSbZRBR6sqVYQ Extraction code: x0pz After downloading, double-click the index in the restaurant exercise directly HTML file, and then do it one by one The answers are given in code snippets~ W3C description of CSS selector: CSS pseudo class Level operation instructions: 1. Directly selec ...

PHP Deserialization Principle: the serialization string entered by the user is not detected, so that the attacker can control the deserialization process, resulting in code failure Execution, SQL Injection, directory traversal and other uncontrollable consequences. Some magic methods are automatically triggered during deserialization. When ...

** vue event handling ** Generally, v-on is used to listen for events. When listening for DOM events, some js code will be triggered. Use v-on:xxx or @ xxx to bind events. xxx refers to the event name. The callback of the event should be written in the methods object and will eventually be placed on the vm. 2. The function in is managed by ...

preface Recently, I need to implement the requirement of a markdown editor in my project, which is developed based on the React framework, similar to Nuggets: My first thought is that if you can use excellent open source, you must use open source. After all, you can't always build wheels repeatedly. So I asked a lot of friends in my front-e ...

Plugin plug in In the whole process of webpack, loader enables webpack to process more file resources. The plugin exists in the whole packaging process of webpack. The processed content can be processed when the hook exposed by the webpack is triggered. So we can use plugin to process the files in process. index.html file processing Before, ...

Three properties of component instances 1. Attribute I state [concept] React regards components as a state machine. Through the interaction with users, different states are realized, and then the UI is rendered to keep the user interface and data consistent. [note] this in the render method of the component is the component instance obje ...

Using Router, you can build a multi page single page app 1. Install the react router: npm intall react-router-dom 2 basic usage 2.1 App.js import Route component import { Route } from "react-router-dom"; 2.2 App.js definition path: There are two paths: http://localhost:3000/welcome http://localhost:3000/products Load correspo ...