The useRef is a hook for creating values that persist across renders. In this lesson we'll learn how to use the useRef hook to measure the width of an element as it changes. import React, { useState, useEffect, useRef } from "react"; import Reac…

The function forwardRef allows us to extract a ref and pass it to its descendants. This is a powerful tool, but should be used with caution to avoid unexpected ref behaviour. The technique of forwarding refs really starts to shine in combination with…

react系列笔记1 用npx npm命令创建react app create-react-app my-app是开始构建新的 React 单页应用程序的最佳方式.它已经为你设置好了开发环境,以便您可以使用最新的 JavaScript 特性,提供不错的开发体验,并且可以优化你的生产环境应用.你需要在你的机器上安装 Node >= 6 . 安装node.js 工具 Download | Node.jshttps://nodejs.org/en/download/ 安装后再打开cmd执行下面命令:…

React.PropTypes是React用来typechecking的一个属性.要在组件的props上运行typechecking,可以分配特殊的propTypes属性: class Greeting extends React.Component { render() { return ( <h1>Hello {this.props.name}</h1> ) }; } Greeting.propTypes = { name: React.PropTypes.string.isR…

react全家桶从0到1(最新) 本文从零开始,逐步讲解如何用react全家桶搭建一个完整的react项目.文中针对react.webpack.babel.react-route.redux.redux-saga的核心配置会加以讲解,通过这个项目,可以系统的了解react技术栈的主要知识,避免搭建一次后面就忘记的情况. 从webpack开始 思考一下webpack到底做了什么事情?其实简单来说,就是从入口文件开始,不断寻找依赖,同时为了解析各种不同的文件加载相应的loader,最后生成我们希望的…

项目演示地址 项目演示地址 项目代码结构 前言 React 框架的优雅不言而喻,组件化的编程思想使得React框架开发的项目代码简洁,易懂,但早期 React 类组件的写法略显繁琐.React Hooks 是 React 16.8 发布以来最吸引人的特性之一,她简化了原有代码的编写,是未来 React 应用的主流写法. 本文通过一个实战小项目,手把手从零开始带领大家快速入门React Hooks. 在本项目中,会用到以下知识点: React 组件化设计思想 React State 和 Props…

In this lesson I demonstrate how to use the library MDXC to create and import React components with Markdown. MDXC converts markdown into JavaScript and supports JSX. Additional Resources: https://github.com/jamesknelson/mdxc   Create a React app by…

In this lesson, we extend the styles of a base button component to create multiple variations of buttons, using "extend". We can then modify the base styles in one place, and have all button types updated. import React from "react"; im…

In this lesson, we'll use next to create a universal React application with no configuration. We'll create page components that will render on the server if accessed directly, but function as you would expect in the client. We'll use the routing capa…

We will create animated Content Placeholder as React component just like Facebook has when you load the page. Key points: 1. For each elements on the DOM, you might need to create a placeholder components for that. 2. Different size prop is important…