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3 changed files with 46 additions and 55 deletions
+44 -36
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@@ -1,50 +1,58 @@
import { useState, useReducer } from 'react' import React from 'react'
function counterReducer(state, action) { class RandomUser extends React.Component {
switch (action.type) { constructor(props) {
case 'increment': super(props)
return state + 1 this.state = { user: {} }
case 'decrement':
return state - 1
case 'reset':
return 0
case 'set_value':
return action.value
default:
return state
}
} }
function Counter() { componentDidMount() {
const [count, dispatch] = useReducer(counterReducer,0); fetch('https://randomuser.me/api')
.then(responce => responce.json())
.then(json => this.setState({ user: json.results[0] }));
console.log('смонтирован')
}
return ( componentDidUpdate(prevProps,prevState) {
<div> console.log(this.state);
<span>Счетчик: {count}</span> console.log('Компонент обнвлен')
<button onClick={()=> dispatch({type: 'increment'})}>+</button> }
<button onClick={()=> dispatch({type: 'decrement'})}>-</button>
<button onClick={()=> dispatch({type: 'reset'})}>reset</button> componentWillUnmount() {
<button onClick={()=> dispatch({type: 'set_value', value: 5})}>set 5</button> console.log('Компонент таймера размонтирован')
</div> }
render() {
return <div>
{this.state.user &&
this.state.user.name &&
(
<>
<h2>{this.state.user.name.first} {this.state.user.name.last}</h2>
<img src={this.state.user.picture.medium} />
<button onClick={() => {
console.log('Загружаем ... ')
fetch('https://randomuser.me/api')
.then(responce => responce.json())
.then(json => this.setState({ user: json.results[0] }));
}}>Загрузить нового</button>
</>
) )
} }
</div>
}
}
function App() { function App() {
const [tasks, setTasks] = useState([]) const [showClock, setShowClock] = React.useState(true);
const [filter, setFilter] = useState('all')
const [sortBy,setSortBy] = useState('date')
const addTask = newTask => {
setTasks([...tasks,newTask])
}
return ( return (
<> <>
{/* Добавьте тестовый контент для проверки */} <h1>Домашнее задание: жизненый цикл</h1>
<h1>Hello, React!</h1> <button onClick={()=> setShowClock(!showClock)}>
<Counter /> {showClock ? 'Скрыть часы' : 'Показать часы' }
</button>
{showClock && <RandomUser />}
</> </>
) )
} }
-15
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@@ -1,15 +0,0 @@
.container {
/* display: flex;
flex-direction: column;
flex-wrap: nowrap;*/
height: 500px;
overflow: auto;
border: 1px solid black;
}
.item {
font-size: 16pt;
border: 1px dotted gray;
/*margin: 5px 10px;
padding: 10px;*/
border-radius: 5px;
}
-2
View File
@@ -4,7 +4,5 @@ import { createRoot } from 'react-dom/client'
import App from './App.jsx' import App from './App.jsx'
createRoot(document.getElementById('root')).render( createRoot(document.getElementById('root')).render(
<StrictMode>
<App /> <App />
</StrictMode>
) )