一.脚手架创建项目

1.安装

全局安装npm i -g create-react-app或者yarn global add create-react-app。

2.初始化

create-react-app my-app，my-app 表示项目名称，可以修改。

3.启动项目

yarn startor npm start。

🙁 缺点：全局安装命令无法保证命令一直是最新版本。

4.启动后的页面

yarn创建react的命令 react如何创建项目_前端

二.渲染一个自己的界面

1.步骤

  1. 删除 src 和 public 目录中的所有内容。
  2. 新建 public/index.html。
  3. 新建 src/index.js 文件。
  4. 引入 React 核心库和涉及 DOM 操作的包。
  5. 调用 React.createElement() 方法创建 React 元素。
  6. 调用 ReactDOM.render() 方法渲染 React 元素到页面

2.代码

public/index.html
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
</head>

<body>
  <div id="root"></div>
</body>

</html>
src/index.js
// create-react-app 脚手架生成的项目中已经下载好了 react 和 react-dom，无需重复下载，直接使用即可
import React from 'react'
import ReactDOM from 'react-dom'
// 标签名、标签属性、标签内容，返回的是一个 React 元素（虚拟 DOM）
 const title = React.createElement('h1', null, 'Hello World')调用 ReactDOM.render() 方法渲染 React 元素到页面
ReactDOM.render(title, document.querySelector('#root'))

3.创建好的页面

yarn创建react的命令 react如何创建项目_html_02

 

三.JSX

为什么要有JSX

React.createElement（）创建React元素的问题:繁琐/不简洁;不直观

React.createElement(
    'div',
    { className: 'wrap' },
    React.createElement('ul', null, React.createElement('li', null, 'React'), React.createElement('li', null, 'Vue'), React.createElement('li', null, 'Angular'))
)

对比下面JSX的写法

<div class="wrap">
    <ul>
        <li>React</li>
        <li>Vue</li>
        <li>Angular</li>
    </ul>
</div>

JSX是什么

JSX是javaScrpit XML的简写,表示可以在JavaScri

ReactDOM.render(title, document.querySelector('#root'))

pt代码中写XML（HTML）格式的代码

优势:声明式语法更加直观,与HTML结构相同,降低了学习成本,提高了开发效率,JSX是React的核心之一

JSX的基本使用

1.使用 JSX 创建 React 元素

const title = <h1>Hello JSX</h1>

2.使用 ReactDOM.render() 方法渲染 React 元素到页面中

ReactDOM.render(title, document.querySelector('#root'))

JSX 是如何工作的

🤔 换句话说，JSX 并不是标准的 ECMAScript 语法，为什么 React 脚手架中可以直接使用 JSX 呢？

JSX需要使用Babel编译成React.creatElement()的形式,然后配合React才能在浏览器中使用,而create-react-app脚手架中已经内置了Babel以及相关配置

JSX注意点

const r = (
    <div className='wrap'>
        <h1>Hello World</h1>
        <p>React</p>
    </div>
)

1.必循有一个根节点,或者虚拟根节点<></>

2.属性名一般是驼峰的写法且不能是 JS 中的关键字，例如 class 改成 className，label 的 for 属性改为 htmlFor，colspan 改为 colSpan。

3.元素若没有子节点，可以使用单标签，但一定要闭合，例如 <span/>。

4.React@16.14 之前需要先引入 React 才能使用 JSX（这个也好理解，因为 JSX 最后还是要被转成 React.createElement() 的形式）

5.换行建议使用 () 进行包裹，防止换行的时候自动插入分号的 Bug。

yarn创建react的命令 react如何创建项目_yarn创建react的命令_03

 四.使用表达式

单大括号中可以使用任意的表达式(可以产生结果的式子)

普通的简单数据类型。

const name = 'zs'
const age = 18
const title = (
    <h1>
        姓名：{name}, 年龄：{age}
    </h1>
)

对象中的属性

const car = {
    brand: '玛莎拉蒂',
}
const title = <h1>汽车：{car.brand}</h1>

数组中的某一项甚至整个数组

const friends = ['张三', '李四']
const title = <h1>汽车：{friends}</h1>

可以调用方法

function sayHi() {
    return '你好'
}
const title = <h1>姓名：{sayHi()}</h1>

注意

JS对象虽然也是表达式,但是不能直接嵌套在{}中,一般只会出现在style属性中。

JSX本身也是表达式

const span = <span>我是一个span</span>
const title = <h1>盒子{span}</h1>

小结

  JSX中可以包含任意的表达式(除了对象) 

  JSX中不能放语句,例如if,switch,for,while等

内容

📝 需求：isLoading 是 true，显示“加载中…”，否则显示“加载完毕！”。

import ReactDOM from 'react-dom'


const isLoading =false


const loadData = () => {

    if (isLoading) {

        return <h2>数据加载中，请稍后...</h2>

    }

    return <h2>数据加载完成，此处显示了加载后的数据</h2>

}


ReactDOM.render(loadData(), document.querySelector('#root'))

显示出的结果

yarn创建react的命令 react如何创建项目_JSX_04

 三元表达式的写法如下

const loadData = () => {
    return <h2>{isLoading ? '数据加载中，请稍后...' : '数据加载完成，此处显示了加载后的数据'}</h2>
}

列表渲染

能在JSX中使用数组的map方法来生产列表结构

后端返回的数据

const arr = [
    { id: 1, name: 'Vue' },
    { id: 2, name: 'React' },
    { id: 3, name: 'Angular' },
]

期望实现的效果

yarn创建react的命令 react如何创建项目_html_05

 

import ReactDOM from 'react-dom'

const list = [
    { id: 1, name: 'Vue' },
    { id: 2, name: 'React' },
    { id: 3, name: 'Angular' },
]

const arrJsx = list.map((item) => <li key={item.id}>{item.name}</li>)

const loadData = () => {
    return <ul>{arrJsx}</ul>
}

ReactDOM.render(loadData(), document.querySelector('#root'))

关于key

1.特点:key值要保证唯一,尽量避免使用索引号,key在最终的HTML结构是看不见的

2.加在哪里,map（）遍历谁,就把key加在谁上

3.作用:React内部用来进行性能优化

练习

const list = [
    { id: 1, name: '武汉', salary: 11000 },
    { id: 2, name: '北京', salary: 13000 },
    { id: 3, name: '长沙', salary: 15000 },
]
<ul>
    <li>
        <h3>城市：武汉</h3>
        <p>工资：11000</p>
    </li>
    <li>
        <h3>城市：长沙</h3>
        <p>工资：15000</p>
    </li>
</ul>
import ReactDOM from 'react-dom'

const list = [
  { id: 1, name: '武汉', salary: 11000 },
  { id: 2, name: '北京', salary: 13000 },
  { id: 3, name: '长沙', salary: 15000 },
]

const arrJsx = list.map((item) => <li key={item.id}>
  <h3>城市:{item.name}</h3>
  <p>工资:{item.salary}</p>
</li>)

const loadData = () => {
    return <ul>{arrJsx}</ul>
}

ReactDOM.render(loadData(), document.querySelector('#root'))

图示:

yarn创建react的命令 react如何创建项目_JSX_06

  五.样式处理 

 行内样式

语法:

<元素 style={ {css属性1：值1,css属性2：值2} }></元素>

需求:

yarn创建react的命令 react如何创建项目_前端_07

 <div style={{ width: 200, height: 200, lineHeight: '200px', backgroundColor: 'black', color: 'white', textAlign: 'center', fontSize: 30 }}>React</div>

注意点

a. 为啥有两个{{}}，外层的{}表示要开始写JS表达式了,内部的{}表示一个对象

b.属性名是小驼峰格式，例如background-color 需要些成backgroundColor

c.属性值是字符串,如果单位是px,可以简写数值

className

用className定义类名

在src目录下准备index.css文件,然后在index.js文件中通过import './index.css'引入文件      

index.css

.title {
    width: 200px;
    height: 200px;
    color: white;
    background-color: black;
}

index.js

import ReactDOM from 'react-dom'

import './index.css'
<div className='title'>Hello React</div>

const loadData = () => {
    return <div className='title'>Hello React</div>
}

小结

类名使用className,推荐

行内样式,<div style={{ color: 'red' }}>Hello</div>

B 站评论列表 📝

综合使用JSX的知识,结合数据,结构和样式渲染成如下效果

yarn创建react的命令 react如何创建项目_JSX_08

资源准备

index.html

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
        <link rel="stylesheet" href="./index.css" />
    </head>

    <body>
        <div class="App">
            <div class="comment-container">
                <div class="comment-head"><span>1 评论</span></div>
                <div class="tabs-order">
                    <ul class="sort-container">
                        <li class="">按热度排序</li>
                        <li class="on">按时间排序</li>
                    </ul>
                </div>
                <div class="comment-send">
                    <div class="user-face"><img class="user-head" src="avatar.png" alt="" /></div>
                    <div class="textarea-container"><textarea cols="80" rows="5" placeholder="发条友善的评论" class="ipt-txt"></textarea><button class="comment-submit">发表评论</button></div>
                    <div class="comment-emoji"><i class="face"></i><span class="text">表情</span></div>
                </div>
                <div class="comment-list">
                    <div class="list-item">
                        <div class="user-face"><img class="user-head" src="https://y.qq.com/music/photo_new/T001R300x300M000003aQYLo2x8izP.jpg?max_age=2592000" alt="" /></div>
                        <div class="comment">
                            <div class="user">刘德华</div>
                            <p class="text">给我一杯忘情水</p>
                            <div class="info">
                                <span class="time">2021-10-10 09:09:00</span><span class="like liked"><i class="icon"></i></span><span class="hate"><i class="icon"></i></span
                                ><span class="reply btn-hover">删除</span>
                            </div>
                        </div>
                    </div>
                    <div class="list-item">
                        <div class="user-face"><img class="user-head" src="https://y.qq.com/music/photo_new/T001R500x500M0000025NhlN2yWrP4.jpg?max_age=2592000" alt="" /></div>
                        <div class="comment">
                            <div class="user">周杰伦</div>
                            <p class="text">听妈妈的话</p>
                            <div class="info">
                                <span class="time">2021-10-11 09:09:00</span><span class="like"><i class="icon"></i></span><span class="hate"><i class="icon"></i></span
                                ><span class="reply btn-hover">删除</span>
                            </div>
                        </div>
                    </div>
                    <div class="list-item">
                        <div class="user-face"><img class="user-head" src="https://y.qq.com/music/photo_new/T001R500x500M000003Nz2So3XXYek.jpg?max_age=2592000" alt="" /></div>
                        <div class="comment">
                            <div class="user">陈奕迅</div>
                            <p class="text">十年</p>
                            <div class="info">
                                <span class="time">2021-10-11 10:09:00</span><span class="like"><i class="icon"></i></span><span class="hate hated"><i class="icon"></i></span
                                ><span class="reply btn-hover">删除</span>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </body>
</html>

index.css

* {
    margin: 0;
    padding: 0;
    list-style: none;
}
.App {
    /* width: 1090px; */

    width: 80%;
    margin: 50px auto;
}
.comment-head {
    margin: 0 0 20px;
    font-size: 18px;
    line-height: 24px;
    color: #222;
}

.comment-send {
    margin: 10px 0;
}

.user-face {
    float: left;
    margin: 7px 0 0 5px;
    position: relative;
}

.user-head {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.textarea-container {
    position: relative;
    margin-left: 85px;
    margin-right: 80px;
}
.textarea-container:hover .ipt-txt {
    background-color: #fff;
    border-color: #00a1d6;
}

.ipt-txt {
    font-size: 12px;
    display: inline-block;
    box-sizing: border-box;
    background-color: #f4f5f7;
    border: 1px solid #e5e9ef;
    overflow: auto;
    border-radius: 4px;
    color: #555;
    width: 100% !important;
    height: 65px;
    transition: 0s;
    padding: 5px 10px;
    line-height: normal;
    resize: none;
    outline: none;
}

.comment-submit {
    width: 70px;
    height: 64px;
    position: absolute;
    right: -80px;
    top: 0;
    padding: 4px 15px;
    font-size: 14px;
    color: #fff;
    border-radius: 4px;
    text-align: center;
    min-width: 60px;
    vertical-align: top;
    cursor: pointer;
    background-color: #00a1d6;
    border: 1px solid #00a1d6;
    transition: 0.1s;
    user-select: none;
    outline: none;
}
.comment-submit:hover {
    background-color: #00b5e5;
    border-color: #00b5e5;
}

.comment-emoji {
    padding: 0;
    width: 66px;
    height: 24px;
    color: #99a2aa;
    border: 1px solid #e5e9ef;
    border-radius: 4px;
    position: relative;
    font-size: 12px;
    text-align: center;
    line-height: 23px;
    margin-left: 86px;
    margin-top: 3px;
    cursor: pointer;
    display: inline-block;
}
.comment-emoji:hover {
    color: #6d757a;
}

.face {
    display: inline-block;
    vertical-align: middle;
    line-height: 1;
    width: 16px;
    height: 16px;
    margin-right: 5px;
    background: 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        no-repeat -408px -24px;
}
.comment-emoji:hover .face {
    background-position: -472px -24px;
}

.comment-emoji .text {
    display: inline-block;
    vertical-align: middle;
    line-height: 1;
    font-size: 12px !important;
}

.tabs-order {
    margin: 0 0 24px 0;
    border-bottom: 1px solid #e5e9ef;
}

.sort-container {
    display: flex;
}

.tabs-order li {
    background-color: transparent;
    border-radius: 0;
    border: 0;
    padding: 8px 0;
    margin-right: 16px;
    border-bottom: 1px solid transparent;
    position: relative;
    float: left;
    cursor: pointer;
    line-height: 20px;
    height: 20px;
    font-size: 14px;
    font-weight: bold;
    color: #222;
}

.tabs-order li:last-child {
    margin: 0 16px;
}

.tabs-order li.on {
    border-bottom: 1px solid #00a1d6;
    color: #00a1d6;
}

.tabs-order li.on::after {
    content: '';
    width: 6px;
    height: 3px;
    background: transparent
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-669px -31px
        no-repeat;
    position: absolute;
    bottom: 0;
    left: 50%;
    margin-left: -3px;
    visibility: visible;
}

.list-item {
    display: flex;
}
.list-item:first-child {
    padding-top: 22px;
}

.comment {
    flex: 1;
    position: relative;
    margin-left: 35px;
    padding: 22px 0 14px 0;
    border-top: 1px solid #e5e9ef;
}
.list-item:last-child .comment {
    border-bottom: 1px solid #e5e9ef;
}

.comment .user {
    color: #6d757a;
    font-size: 12px;
    font-weight: bold;
    line-height: 18px;
    padding-bottom: 4px;
    display: block;
    word-wrap: break-word;
    position: relative;
}

.comment .text {
    line-height: 20px;
    padding: 2px 0;
    font-size: 14px;
    text-shadow: none;
    overflow: hidden;
    word-wrap: break-word;
    word-break: break-word;
    white-space: pre-wrap;
}

.info {
    color: #99a2aa;
    line-height: 26px;
    font-size: 12px;
}

.icon {
    cursor: pointer;
    background: 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        no-repeat;
}

.time {
    margin-right: 20px;
}

.like {
    cursor: pointer;
    margin-right: 20px;
}

.like > i {
    display: inline-block;
    width: 14px;
    height: 14px;
    vertical-align: text-top;
    margin-right: 5px;
    background-position: -153px -25px;
}
.like:hover > i {
    background-position: -218px -25px;
}
.info .liked > i {
    background-position: -154px -89px;
}

.hate {
    cursor: pointer;
    margin-right: 15px;
}

.hate > i {
    display: inline-block;
    width: 14px;
    height: 14px;
    vertical-align: text-top;
    margin-right: 5px;
    background-position: -153px -153px;
}

.hate:hover > i {
    background-position: -217px -153px;
}
.info .hated > i {
    background-position: -154px -217px;
}

.btn-hover {
    padding: 0 5px;
    border-radius: 4px;
    margin-right: 15px;
    cursor: pointer;
    display: inline-block;
}

.btn-hover:hover {
    color: #00a1d6;
    background: #e5e9ef;
}

代码

import ReactDOM from 'react-dom'
import './index.css'
import avatar from './static/007wpEetly1gxr5aih1j9j30u0140dnj.jpg'

const state = {
    // hot: 热度排序  time: 时间排序
    tabs: [
        {
            id: 1,
            name: '热度',
            type: 'hot',
        },
        {
            id: 2,
            name: '时间',
            type: 'time',
        },
    ],
    active: 'time',
    list: [
        {
            id: 1,
            author: '刘德华',
            comment: '给我一杯忘情水',
            time: '2021-11-10 09:09:00',
            img: 'https://y.qq.com/music/photo_new/T001R300x300M000003aQYLo2x8izP.jpg?max_age=2592000',
            // 1: 点赞 0：无态度 -1:踩
            attitude: 1,
        },
        {
            id: 2,
            author: '周杰伦',
            comment: '听妈妈的话',
            time: '2021-12-11 09:09:00',
            img: 'https://y.qq.com/music/photo_new/T001R500x500M0000025NhlN2yWrP4.jpg?max_age=2592000',
            // 1: 点赞 0：无态度 -1:踩
            attitude: 0,
        },
        {
            id: 3,
            author: '陈奕迅',
            comment: '十年',
            time: '2021-10-11 10:09:00',
            img: 'https://y.qq.com/music/photo_new/T001R500x500M000003Nz2So3XXYek.jpg?max_age=2592000',
            // 1: 点赞 0：无态度 -1:踩
            attitude: -1,
        },
    ],
}

const content = (
    <div className='App'>
        <div className='comment-container'>
            <div className='comment-head'>
                <span>{state.list.length} 评论</span>
            </div>
            <div className='tabs-order'>
                <ul className='sort-container'>
                    {state.tabs.map((item) => (
                        <li className={item.type === state.active ? 'on' : ''} key={item.id}>
                            按{item.name}排序
                        </li>
                    ))}
                </ul>
            </div>
            <div className='comment-send'>
                <div className='user-face'>
                    <img className='user-head' src={avatar} alt='' />
                </div>
                <div className='textarea-container'>
                    <textarea cols='80' rows='5' placeholder='发条友善的评论' className='ipt-txt'></textarea>
                    <button className='comment-submit'>发表评论</button>
                </div>
                <div className='comment-emoji'>
                    <i className='face'></i>
                    <span className='text'>表情</span>
                </div>
            </div>
            <div className='comment-list'>
                {state.list.map((item) => (
                    <div className='list-item' key={item.id}>
                        <div className='user-face'>
                            <img className='user-head' src={item.img} alt='' />
                        </div>
                        <div className='comment'>
                            <div className='user'>{item.author}</div>
                            <p className='text'>{item.comment}</p>
                            <div className='info'>
                                <span className='time'>{item.time}</span>
                                <span className={item.attitude === 1 ? 'like liked' : 'like'}>
                                    <i className='icon'></i>
                                </span>
                                <span className={item.attitude === -1 ? 'hate hated' : 'hate'}>
                                    <i className='icon'></i>
                                </span>
                                <span className='reply btn-hover'>删除</span>
                            </div>
                        </div>
                    </div>
                ))}
            </div>
        </div>
    </div>
)

ReactDOM.render(content, document.querySelector('#root'))

图：

yarn创建react的命令 react如何创建项目_html_09