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网站规划文字说明,帝国网站的互动专栏怎么做,中国与俄罗斯最新局势,新乡网站建设制作报价方案目录#xff1a; react脚手架创建项目并启动react脚手架项目结构一个简单的Hello组件样式的模块化功能界面的组件化编码流程#xff08;通用#xff09;组件的组合使用-TodoList
1.react脚手架 xxx脚手架: 用来帮助程序员快速创建一个基于xxx库的模板项目 包含了所有需…目录 react脚手架创建项目并启动react脚手架项目结构一个简单的Hello组件样式的模块化功能界面的组件化编码流程通用组件的组合使用-TodoList   1.react脚手架 xxx脚手架: 用来帮助程序员快速创建一个基于xxx库的模板项目 包含了所有需要的配置语法检查、jsx编译、devServer…下载好了所有相关的依赖可以直接运行一个简单效果react提供了一个用于创建react项目的脚手架库: create-react-app项目的整体技术架构为:  react webpack es6 eslint使用脚手架开发的项目的特点: 模块化, 组件化, 工程化 2.创建项目并启动 全局安装npm i -g create-react-app切换到想创项目的目录使用命令create-react-app hello-react进入项目文件夹cd hello-react启动项目npm start 3.react脚手架项目结构 public —- 静态资源文件夹                         favicon.icon —— 网站页签图标                         index.html ——– 主页面                         logo192.png ——- logo图                         logo512.png ——- logo图                         manifest.json —– 应用加壳的配置文件                         robots.txt ——– 爬虫协议文件 src —- 源码文件夹                         App.css ——– App组件的样式                         App.js ——— App组件                         App.test.js —- 用于给App做测试                         index.css —— 样式                         index.js ——- 入口文件                         logo.svg ——- logo图                         reportWebVitals.js — 页面性能分析文件(需要web-vitals库的支持)                         setupTests.js —- 组件单元测试的文件(需要jest-dom库的支持) 4.一个简单的Hello组件 Hello.jsx import React, {Component} from react import ./Hello.cssexport default class Hello extends Component {render() {return h2 classNametitlehello,react!/h2} } Hello.css .title {background-color: orange; } Welcome.jsx import React, {Component} from react; import ./Welcome.cssexport default class Welcome extends Component {render() {return h2 classNamedemowelcome/h2} } Welcome.css .demo {background-color: skyblue; } App.js import React from react import Hello from ./components/Hello/Hello; import Welcome from ./components/Welcome/Welcome;export default class App extends React.Component {render() {return (divHello/HelloWelcome/Welcome/div)} } index.js import React from react; import ReactDOM from react-dom/client; import App from ./App;const root ReactDOM.createRoot(document.getElementById(root)); root.render(App/); 运行结果 5.样式的模块化  Hello.jsx import React, {Component} from react import hellocss from ./Hello.module.cssexport default class Hello extends Component {render() {return h2 className{hellocss.title}hello,react!/h2} } Hello.module.css .title {background-color: orange; } Welcome.jsx import React, {Component} from react; import welcomecss from ./Welcome.module.cssexport default class Welcome extends Component {render() {return h2 className{welcomecss.title}welcome/h2} } Welcome.module.css .title {background-color: skyblue; } 运行结果: 6.功能界面的组件化编码流程通用 拆分组件: 拆分界面,抽取组件实现静态组件: 使用组件实现静态页面效果实现动态组件 动态显示初始化数据 数据类型数据名称保存在哪个组件?交互(从绑定事件监听开始) 7.组件的组合使用-TodoList   todoList案例相关知识点 拆分组件、实现静态组件注意: className、style的写法动态初始化列表如何确定将数据放在哪个组件的state中? 某个组件使用放在自身的state中某些组件使用:放在他们共同的父组件state中(官方称此操作为:状态提升关于父子之间通信: 【父组件】给【子组件】传递数据:通过props传递【子组件】给【父组件】传递数据:通过props传递要求父提前给子传递注意defaultchecked 和 checked的区别类似的还有: defaultValue 和 value状态在哪里操作状态的方法就在哪里 Footer.css /footer/ .todo-footer {height: 40px;line-height: 40px;padding-left: 6px;margin-top: 5px; }.todo-footer label {display: inline-block;margin-right: 20px;cursor: pointer; }.todo-footer label input {position: relative;top: -1px;vertical-align: middle;margin-right: 5px; }.todo-footer button {float: right;margin-top: 5px; } Footer.jsx import React, {Component} from react; import ./Footer.cssclass Footer extends Component {handleCheckAll (event) {this.props.checkAllTodo(event.target.checked)}handleClearAllDone () {this.props.clearAllDone()}render() {const {todos} this.propsconst doneCount todos.reduce((pre, current) {return pre (current.done ? 1 : 0)}, 0)const total todos.lengthreturn (div classNametodo-footerlabelinput typecheckbox onChange{this.handleCheckAll}checked{doneCount total total ! 0 ? true : false}//labelspanspan已完成{doneCount}/span / 全部{total}/spanbutton onClick{this.handleClearAllDone} classNamebtn btn-danger清除已完成任务/button/div);} }export default Footer; Header.css /header/ .todo-header input {width: 560px;height: 28px;font-size: 14px;border: 1px solid #ccc;border-radius: 4px;padding: 4px 7px; }.todo-header input:focus {outline: none;border-color: rgba(82, 168, 236, 0.8);box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6); } Header.jsx import React, {Component} from react; import PropTypes from prop-types import {nanoid} from nanoid; import ./Header.cssclass Header extends Component {static propTypes {addTodo: PropTypes.func.isRequired}handleKeyUp (event) {const {keyCode, target} eventif (keyCode ! 13) returnif (target.value.trim() ) {alert(输入不能为空)return;}const todoObj {id: nanoid(), name: target.value, done: false}this.props.addTodo(todoObj)target.value }render() {return (div classNametodo-headerinput onKeyUp{this.handleKeyUp} typetext placeholder请输入你的任务名称按回车键确认//div);} }export default Header; Item.css /item/ li {list-style: none;height: 36px;line-height: 36px;padding: 0 5px;border-bottom: 1px solid #ddd; }li label {float: left;cursor: pointer; }li label li input {vertical-align: middle;margin-right: 6px;position: relative;top: -1px; }li button {float: right;display: none;margin-top: 3px; }li:before {content: initial; }li:last-child {border-bottom: none; } Item.jsx import React, {Component} from react; import ./Item.cssclass Item extends Component {state {mouse: false}handelMouse (flag) {return () {this.setState({mouse: flag})}}handleCheck (id) {return (event) {this.props.updateTodo(id, event.target.checked)}}handleDelete (id) {if (window.confirm(确定删除吗)) {this.props.deleteTodo(id)}}render() {const {id, name, done} this.propsconst {mouse} this.statereturn (li style{{backgroundColor: mouse ? #ddd : white}} onMouseEnter{this.handelMouse(true)}onMouseLeave{this.handelMouse(false)}labelinput typecheckbox checked{done} onChange{this.handleCheck(id)}/span{name}/span/labelbutton onClick{() {this.handleDelete(id)}}classNamebtn btn-dangerstyle{{display: mouse ? block : none}}删除/button/li);} }export default Item; List.css /main/ .todo-main {margin-left: 0px;border: 1px solid #ddd;border-radius: 2px;padding: 0px; }.todo-empty {height: 40px;line-height: 40px;border: 1px solid #ddd;border-radius: 2px;padding-left: 5px;margin-top: 10px; } List.jsx import React, {Component} from react; import PropTypes from prop-types; import Item from ../Item/Item; import ./List.cssclass List extends Component {static propTypes {todos: PropTypes.array.isRequired,updateTodo: PropTypes.func.isRequired,deleteTodo: PropTypes.func.isRequired}render() {const {todos, updateTodo, deleteTodo} this.propsreturn (ul classNametodo-main{todos.map((todo) {return Item key{todo.id} {…todo} updateTodo{updateTodo} deleteTodo{deleteTodo}/Item})}/ul);} }export default List; App.css /base/ body {background: #fff; }.btn {display: inline-block;padding: 4px 12px;margin-bottom: 0;font-size: 14px;line-height: 20px;text-align: center;vertical-align: middle;cursor: pointer;box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);border-radius: 4px; }.btn-danger {color: #fff;background-color: #da4f49;border: 1px solid #bd362f; }.btn-danger:hover {color: #fff;background-color: #bd362f; }.btn:focus {outline: none; }.todo-container {width: 600px;margin: 0 auto; }.todo-container .todo-wrap {padding: 10px;border: 1px solid #ddd;border-radius: 5px; } App.js import React, {Component} from react; import ./App.css import Header from ./components/Header/Header; import Footer from ./components/Footer/Footer; import List from ./components/List/List;class App extends Component {//初始化状态state {todos: [{id: 001, name: 吃饭, done: true},{id: 002, name: 睡觉, done: true},{id: 003, name: 打代码, done: false},{id: 004, name: 逛街, done: true},]}addTodo (todoObj) {const {todos} this.stateconst newTodos [todoObj, …todos]this.setState({todos: newTodos})}updateTodo (id, done) {const {todos} this.stateconst newTodos todos.map((todoObj) {if (todoObj.id id) {return {…todoObj, done: done}} else {return todoObj}})this.setState({todos: newTodos})}deleteTodo (id) {const {todos} this.stateconst newTodos todos.filter((todoObj) {return todoObj.id ! id})this.setState({todos: newTodos})}checkAllTodo (done) {const {todos} this.stateconst newTodos todos.map((todoObj) {return {…todoObj, done: done}})this.setState({todos: newTodos})}clearAllDone () {const {todos} this.stateconst newTodos todos.filter((todoObj) {return !todoObj.done})this.setState({todos: newTodos})}render() {return (div classNametodo-containerdiv classNametodo-wrapHeader addTodo{this.addTodo}/HeaderList todos{this.state.todos} updateTodo{this.updateTodo} deleteTodo{this.deleteTodo}/ListFooter todos{this.state.todos}checkAllTodo{this.checkAllTodo}clearAllDone{this.clearAllDone}/Footer/div/div);} }export default App; index.js import React from react; import ReactDOM from react-dom/client; import App from ./App;const root ReactDOM.createRoot(document.getElementById(root)); root.render(App/); 项目结构 ‘’ 运行结果