{"id":13387,"date":"2025-04-18T20:22:59","date_gmt":"2025-04-18T12:22:59","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/13387.html"},"modified":"2025-04-18T20:22:59","modified_gmt":"2025-04-18T12:22:59","slug":"react%e5%ad%a6%e4%b9%a0day02%ef%bc%88%e6%81%a8%e8%bf%9e%e6%8e%a5%e4%b8%8d%e4%b8%8a%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/13387.html","title":{"rendered":"REACT\u5b66\u4e60DAY02\uff08\u6068\u8fde\u63a5\u4e0d\u4e0a\u670d\u52a1\u5668\uff09"},"content":{"rendered":"

\u53d7\u63a7\u8868\u5355\u7ed1\u5b9a<\/h4>\n

\u6982\u5ff5：\u4f7f\u7528React\u7ec4\u4ef6\u7684\u72b6\u6001（useState）\u63a7\u5236\u8868\u5355\u7684\u72b6\u6001<\/p>\n

\"\"<\/p>\n

1. \u51c6\u5907\u4e00\u4e2aReact\u72b6\u6001\u503c<\/p>\n

const [value,setValue] = useState('') <\/p>\n

2. \u901a\u8fc7value\u5c5e\u6027\u7ed1\u5b9a\u72b6\u6001，\u901a\u8fc7onChange\u5c5e\u6027\u7ed1\u5b9a\u72b6\u6001\u540c\u6b65\u7684\u51fd\u6570<\/p>\n

<input
\ntype="text"
\nvalue={value}
\nonChange={(e) => setValue(e.target.value)}
\n\/> <\/p>\n

React\u4e2d\u83b7\u53d6DOM<\/h4>\n

\u5728 React \u7ec4\u4ef6\u4e2d\u83b7\u53d6\/\u64cd\u4f5c DOM，\u9700\u8981\u4f7f\u7528 useRef React Hook\u94a9\u5b50\u51fd\u6570，\u5206\u4e3a\u4e24\u6b65:<\/p>\n

1. \u4f7f\u7528useRef\u521b\u5efa ref \u5bf9\u8c61，\u5e76\u4e0e JSX \u7ed1\u5b9a<\/p>\n

const inputRef = useRef(null)
\n<input type="text" ref={inputRef} \/> <\/p>\n

2. \u5728DOM\u53ef\u7528\u65f6，\u901a\u8fc7 inputRef.current \u62ff\u5230 DOM \u5bf9\u8c61<\/p>\n

\u516b\u8001\u5e08\u8bf4\u8d3a\u8d8a\u8bf4\u8981\u5148\u770b\u5343\u950b\u634f<\/p>\n

\u6240\u4ee5\u8f6c\u6218 \u4e86<\/p>\n

\u611f\u89c9\u81ea\u5df1\u6709\u70b9\u7406\u89e3\u4e86react\u57fa\u672c\u4f7f\u7528？<\/p>\n

\"\"<\/p>\n

\u00a0\u8fd9\u4ed6\u55b5\u4e0d\u662f\u548c\u9ed1\u9a6c\u662f\u4e24\u4e2a\u4e1c\u897f\u5417<\/p>\n

\u5f53\u65f6\u8c46\u5305\u5efa\u8bae\u6211\u4e0b\u7684<\/p>\n

\u8fd9\u4e2a\u811a\u624b\u67b6\u9700\u8981\u8f83\u9ad8\u7248\u672c\u7684Node.js（14.18+,16+）<\/p>\n

\u7136\u540e\u53ef\u4ee5<\/p>\n

npm create vite@latest <\/p>\n

\"\"<\/p>\n

\u5728\u5b89\u88c5\u7684\u65f6\u5019\u53ef\u4ee5\u9009JS\u6216\u8005JS+SWC<\/p>\n

\u6240\u4ee5\u6211\u4eec\u9009\u62e9JS+SWC<\/p>\n

\u00a0\u5728\u6587\u4ef6\u4e0a\u9762vite.svg\u662f\u6ca1\u6709\u88ab\u7f16\u8bd1\u8fc7\u7684<\/p>\n

\u4f7f\u7528npm run build\u5c31\u662f\u628a\u5b83\u7ed9\u6253\u5305<\/p>\n

\"\"<\/p>\n

\u9006\u5929\u8ffd\u8e2a<\/p>\n

\u5df2\u7ecf\u53d6\u6d88\u4e86<\/p>\n

\u53ea\u80fd\u8bf4\u6211\u7684\u670d\u52a1\u5668\u6302\u4e86\u548c\u6211\u4e5f\u8131\u4e0d\u5f00\u5173\u7cfb<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

ESLint\u914d\u7f6e\u4e0ePrettier\u914d\u7f6e<\/h4>\n

ESLint\u662f\u4ee3\u7801\u89c4\u8303\u63d2\u4ef6<\/p>\n

npm run lint
\nvite-plugin-eslint <\/p>\n

\"\"<\/p>\n

Prettier\u662f\u4ee3\u7801\u683c\u5f0f\u5316\u63d2\u4ef6<\/p>\n

\"\"<\/p>\n

\u4e0b\u8f7d\u4e00\u4e2a\u8fd9\u4e2a\u4e1c\u897f<\/p>\n

\u00a0\u7136\u540e\u8fd8\u662f\u6309Alt+Shift+F\u5c31\u683c\u5f0f\u5316\u4e86<\/p>\n

React\u6a21\u5757\u4e0ereact-dom\u6a21\u5757\u5206\u522b\u8d77\u4ec0\u4e48\u4f5c\u7528<\/h4>\n

react\u6a21\u5757\u6709\u6838\u5fc3\u529f\u80fd\u548c\u7ec4\u4ef6<\/p>\n

react-dom\u6a21\u5757\u662f\u64cd\u4f5c\u6d4f\u89c8\u5668DOM，react-dom\/server<\/p>\n

JSX\u4e0eHTML\u4e4b\u95f4\u5199\u6cd5\u7684\u533a\u522b<\/h4>\n

\u9996\u5148\u662f\u6807\u7b7e\u8981\u5c0f\u5199\u3001\u5fc5\u987b\u95ed\u5408<\/p>\n

\u7136\u540e\u662f\u7c7b\u9009\u62e9\u5668\u8981\u5199\u6210className<\/p>\n

for\u5c5e\u6027\u8981\u6362\u6210htmlFor<\/p>\n

<label htmlFor="elem">\u7528\u6237\u540d<\/label> <\/p>\n

\u5c5e\u6027\u662f\u91c7\u53d6\u9a7c\u5cf0\u547d\u540d\u6cd5<\/p>\n

\u5927\u62ec\u53f7\u4f7f\u7528JS<\/p>\n

\u4f46\u662f\u5bf9\u8c61\u548c\u51fd\u6570\u4e0d\u80fd\u76f4\u63a5\u653e\u5230JSX\u7684{}\u4e2d<\/p>\n

\u5c5e\u6027\u53ef\u4ee5\u4f7f\u7528 \u5927\u62ec\u53f7\u6e32\u67d3<\/p>\n

\u53ea\u6709\u552f\u4e00\u7684\u6839\u5143\u7d20<\/p>\n

import { Fragment } from 'react' <\/p>\n

\u8fd9\u4e2a\u76f8\u5f53\u4e8e\u4e00\u4e2a\u5bb9\u5668，\u7b80\u5199\u5c31\u662f\u7a7a\u7bad\u5934<\/p>\n

<><\/> <\/p>\n

\u533a\u522b\u662fFragment\u53ef\u4ee5\u6dfb\u52a0key\u5c5e\u6027<\/p>\n

\u884c\u95f4\u6837\u5f0f\u3001\u5168\u5c40\u6837\u5f0f\u3001\u5c40\u90e8\u6837\u5f0f\u7684\u4f7f\u7528<\/h4>\n

function App(){
\n return(
\n <div style={{width:'100px',height:'100px',background:'red'}}>hello<\/div>
\n )
\n}<\/p>\n

export default App <\/p>\n

\u5199\u7684\u4e1c\u897f\u6700\u540e\u4f1a\u901a\u8fc7\u811a\u624b\u67b6\u7f16\u8bd1\u6210\u65b0\u7684\u4e1c\u897f<\/p>\n

\u5f15\u7528\u7684\u8bdd\u9700\u8981\u8fd9\u6837\u5199：<\/p>\n

<div className={style.box2}>aaa<\/div>
\n<div className={style['head-title']}>bbbbb<\/div> <\/p>\n

\u5f53\u628a\u914d\u7f6e\u6539\u4e00\u4e0b\u4e4b\u540e\u5c31\u597d\u7528\u4e86，\u8fd9\u662fvite.config.js：<\/p>\n

import { defineConfig } from 'vite'
\nimport react from '@vitejs\/plugin-react-swc'
\nimport eslintPlugin from 'vite-plugin-eslint'<\/p>\n

\/\/ https:\/\/vite.dev\/config\/
\nexport default defineConfig({
\n plugins: [
\n react(),
\n eslintPlugin({
\n include: ['src\/*.jsx', 'src\/**\/*.jsx'],
\n }),
\n ],
\n css:{
\n modules:{
\n localsConvention:'camelCase'
\n }
\n }
\n}) <\/p>\n

\u628a\u5b83\u53d8\u6210\u8fd9\u6837\u52a0\u4e00\u4e2acss\u4e4b\u540e\u5c31\u53ef\u4ee5\u4f7f\u7528\u9a7c\u5cf0\u547d\u540d\u4f7f\u7528\u5f15\u5165\u7684\u6837\u5f0f\u4e86<\/p>\n

\"\"<\/p>\n

\u652f\u6301sass\u9884\u5904\u7406\u548cclassnames\u6a21\u5757\u7684\u4f7f\u7528<\/h4>\n

\u600e\u4e48\u652f\u6301\u9884\u5904\u7406\u5462？<\/p>\n

\u6267\u884c\u4e00\u4e0b\u8fd9\u4e2a\u547d\u4ee4：<\/p>\n

npm install sass <\/p>\n

\"\"<\/p>\n

\u6bcf\u4e00\u6b21\u7684\u65cb\u8f6c\u90fd\u662f\u5bf9\u6211\u5c0f\u5fc3\u810f\u7684\u953b\u70bc<\/p>\n

\u5c31\u6015\u53c8\u65ad\u8054\u4e86<\/p>\n

sass.scss<\/p>\n

$bg:red;<\/p>\n

.box3{
\n background-color: $bg;
\n} <\/p>\n

classname\u6a21\u5757\u53c8\u662f\u5728\u5e72\u561b\u7684\u5462？<\/p>\n

\u7ee7\u7eed\u6dfb\u52a0\u4e00\u4e2a\u5305：<\/p>\n

npm install classnames <\/p>\n

import classNames from 'classnames'<\/p>\n

function App(){
\n const myClass = classNames({
\n box1:true,
\n box2:false,
\n })
\n return(
\n \/\/ <div className={ myClass.join(' ')}>
\n \/\/ Hello App
\n \/\/ <\/div>
\n <>
\n <div className={myClass}>
\n hello App
\n <\/div>
\n <\/>
\n )
\n}<\/p>\n

export default App <\/p>\n

\u8fd8\u53ef\u4ee5\u7528\u5176\u4ed6\u7684：<\/p>\n

\"\"<\/p>\n

React\u5143\u7d20\u662f\u5982\u4f55\u6dfb\u52a0\u4e8b\u4ef6\u64cd\u4f5c<\/h4>\n

event\u5408\u6210\u4e8b\u4ef6，\u53ef\u4ee5\u89e3\u51b3\u4e00\u4e9b\u4e8b\u4ef6\u7684\u5904\u7406<\/p>\n

\u4e8b\u4ef6\u59d4\u6258\u5230\u5bb9\u5668\u5143\u7d20<\/p>\n

\u5982\u4f55\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u8fdb\u884c\u4e0d\u540c\u7684\u5185\u5bb9\u6e32\u67d3<\/h4>\n

\"\"<\/p>\n

function App(){
\n let count = 0
\n return (
\n <div>
\n Hello App
\n <br \/>
\n {count >3 ? <div>hello react<\/div> : <p>hi JavaScript<\/p>}
\n <\/div>
\n )
\n}
\nexport default App <\/p>\n

\u522b\u7684\u7c7b\u578b+\u7a7a\u5b57\u7b26\u4e32\u662f\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u7c7b\u578b<\/p>\n

\u4f46\u662f\u5bf9\u8c61\u52a0\u4e0a\u7a7a\u5b57\u7b26\u4e32\u8f6c\u6210\u7684\u662f\u4e0d\u540c\u7684\u683c\u5f0f<\/p>\n

\u5bf9\u4e00\u4e2a\u6570\u636e\u96c6\u5408\u8fdb\u884c\u6279\u91cf\u6e32\u67d3<\/h4>\n

\u5faa\u73af\u8bed\u53e5：for，while<\/p>\n

JSX\u4e2d\u9ed8\u8ba4\u5bf9\u6570\u7ec4\u8fdb\u884cjoin()\u64cd\u4f5c<\/p>\n

\u6570\u7ec4\u65b9\u6cd5:map<\/p>\n

\u5217\u8868\u6e32\u67d3\u9700\u8981\u6dfb\u52a0key\u5c5e\u6027\u3002\u8fd9\u4e9bkey\u4f1a\u544a\u8bc9react，\u6bcf\u4e2a\u7ec4\u4ef6\u91cc\u9762\u5bf9\u5e94\u7740\u6570\u7ec4\u7684\u54ea\u4e00\u9879，\u53ef\u4ee5\u5e2e\u52a9React\u63a8\u65ad\u53d1\u751f\u4e86\u4ec0\u4e48，\u4ece\u800c\u5f97\u4ee5\u6b63\u786e\u5730\u66f4\u65b0DOM\u6811<\/p>\n

\/\/ function App(){
\n\/\/ const list = ['aaaa','bbbb','cccc']
\n\/\/ for(let i=0;i<list.length;i++)
\n\/\/ {
\n\/\/ list[i] = <li>{list[i]}<\/li>
\n\/\/ }
\n\/\/ return (
\n\/\/ <div>hello App
\n\/\/ hello App
\n\/\/ <br \/>
\n\/\/ <ul>
\n\/\/ {list}
\n\/\/ <\/ul>
\n\/\/ <\/div>
\n\/\/ )
\n\/\/ }<\/p>\n

\/\/ export default App<\/p>\n

function App(){
\n const list = ['aaaa','bbbb','cccc']
\n \/\/ for(let i=0;i<list.length;i++)
\n \/\/ {
\n \/\/ list[i] = <li>{list[i]}<\/li>
\n \/\/ }
\n return (
\n <div>
\n hello App
\n <br \/>
\n <ul>
\n { list.map((item,index)=><li key={index}>{item}<\/li>) }
\n <\/ul>
\n <\/div>
\n )
\n}<\/p>\n

export default App <\/p>\n

\u4e24\u79cd\u5b9e\u73b0\u7ec4\u4ef6\u7684\u6807\u8bb0\u5199\u6cd5<\/h4>\n

const Qf = {
\n Welcome() {
\n return <div>hello Welcome<\/div>
\n },
\n}<\/p>\n

const { Welcome } = Qf<\/p>\n

function App() {
\n return (
\n <div>
\n hello App
\n <Qf.Welcome><\/Qf.Welcome>
\n <Welcome><\/Welcome>
\n <\/div>
\n )
\n}<\/p>\n

export default App<\/p>\n

\u8fd8\u6709\u4e00\u79cd\u51fd\u6570\u7684\u5199\u6cd5<\/p>\n

react\/display-name\u00a0\u89c4\u5219\u8981\u6c42\u6bcf\u4e2a React \u7ec4\u4ef6\u90fd\u5e94\u8be5\u6709\u4e00\u4e2a\u663e\u793a\u540d\u79f0，\u5728\u5f00\u53d1\u8005\u5de5\u5177\u548c\u9519\u8bef\u4fe1\u606f\u91cc，\u663e\u793a\u540d\u79f0\u6709\u52a9\u4e8e\u8bc6\u522b\u7ec4\u4ef6\u3002\u5bf9\u4e8e\u51fd\u6570\u5f0f\u7ec4\u4ef6，\u901a\u5e38\u51fd\u6570\u540d\u4f1a\u88ab\u5f53\u4f5c\u663e\u793a\u540d\u79f0，\u4f46\u5bf9\u4e8e\u50cf\u00a0Qf.Welcome\u00a0\u8fd9\u6837\u7684\u5d4c\u5957\u7ec4\u4ef6，ESLint \u53ef\u80fd\u65e0\u6cd5\u81ea\u52a8\u8bc6\u522b\u663e\u793a\u540d\u79f0\u3002<\/p>\n

\u6240\u4ee5\u9700\u8981\u624b\u52a8\u8bbe\u7f6e（\u6211\u770b\u5343\u5cf0\u7684\u4e0a\u9762\u6ca1\u6709\u8981\u6c42\u8fd9\u4e2a，\u53ef\u80fd\u662f\u6211\u7528\u7684\u8fd9\u4e2a\u7248\u672c\u9ad8）<\/p>\n

const Qf=()=>{
\n return (
\n <div>
\n hello Qf
\n <\/div>
\n )
\n}<\/p>\n

\/\/ \u624b\u52a8\u8bbe\u7f6e Qf \u7ec4\u4ef6\u7684\u663e\u793a\u540d\u79f0
\nQf.displayName = 'Qf';<\/p>\n

Qf.Welcome=()=>{
\n return (<div>hello Welcome<\/div>)
\n}<\/p>\n

\/\/ \u624b\u52a8\u8bbe\u7f6e Qf.Welcome \u7ec4\u4ef6\u7684\u663e\u793a\u540d\u79f0
\nQf.Welcome.displayName = 'Qf.Welcome';<\/p>\n

function App() {
\n return (
\n <div>
\n hello App
\n <Qf\/>
\n <Qf.Welcome><\/Qf.Welcome>
\n <\/div>
\n )
\n}<\/p>\n

export default App<\/p>\n","protected":false},"excerpt":{"rendered":"

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