Сделали таймер

src/App.jsx

@@ -1,58 +1,108 @@
 import React from 'react'
 
-class RandomUser extends React.Component {
+class MyComponent extends React.Component {
     constructor(props) {
-        super(props)
+        super(props);
-        this.state = { user: {} }
+        this.state = { data: null };
-    }
+        this.handleClick = this.handleClick.bind(this);
-    
-    componentDidMount() {
-        fetch('https://randomuser.me/api')
-        .then(responce => responce.json())
-        .then(json => this.setState({ user: json.results[0] }));
-        console.log('смонтирован')
-    }
-    
-    componentDidUpdate(prevProps,prevState) {
-        console.log(this.state);
-        console.log('Компонент обнвлен')
-    }
-    
-    componentWillUnmount() {
-        console.log('Компонент таймера размонтирован')
     }
     
     render() {
-        return <div>
+        return (
-            {this.state.user && 
+            <div>
-                this.state.user.name &&
+            {this.state.data ? (
-                (
+                    <div>Данные: {this.state.data}</div>
-                <>
+                ) : (
-                    <h2>{this.state.user.name.first} {this.state.user.name.last}</h2>
+                    <div>Загрузка...</div>
-                    <img src={this.state.user.picture.medium} />
+                )}
-                    <button onClick={() => {
+                <button onClick={this.handleClick}>Обновить</button>
-                        console.log('Загружаем ... ')
-                        fetch('https://randomuser.me/api')
-                        .then(responce => responce.json())
-                        .then(json => this.setState({ user: json.results[0] }));
-                    }}>Загрузить нового</button>
-                </>
-                )
-            }
             </div>
+        )
+    }
+    
+    componentDidMount() {
+        fetch('https://api.example.com/data')
+        .then(responce => responce.json())
+        .then(json => this.setState({data: json}));
+        
+        this.timerId = setInterval(()=> console.log('Tick'), 1000);
+    }
+    
+    componentWillUnmout() {
+        clearInterval(this.timerId);
+    }
+    
+    handleClick() {
+        this.setState({data: 'Данные'})
+    }
+}
+
+class MyComponent2 extends React.Component {
+    controller = new AbortController()
+
+    componentDidMount() {
+        fetch('https://api.example.com/data',{ singnal: this.controller.signal })
+        .then(responce => responce.json())
+        .then(json => this.setState({data: json}))
+        .catch(error => {
+            if(error.name == 'AbortError') {
+                console.log('Aborted');
+            } else {
+                console.log('Other error',error);
+            }
+        });
+    }
+
+    componentWillUnmount() {
+        this.controller.abort()
+    }
+}
+class MyComponent3 extends React.Component {
+    componentDidMount() {
+        this.loadData();
+    }
+    
+    async loadData() {
+        try {
+            const response = await fetch('https://api.example.com/data');
+            const data = await response.json();
+            this.setSate({ data });
+        } catch {
+            console.log('error');
+        }
+    }
+}
+
+class Timer extends React.Component {
+    constructor(props) {
+        super(props);
+        this.state = { seconds: 0 }
+    }
+    
+    componentDidMount() {
+        console.log('Timer mounted');
+        this.interval = setInterval(()=>{
+            this.setState(prevState => ({seconds: prevState.seconds + 1}))
+        },1000);
+    }
+    
+    componentWillUnmount() {
+        console.log('Timer unmount');
+        clearInterval(this.interval);
+    }
+    render() {
+        return <h2>Прошло секунд: {this.state.seconds}</h2>
     }
 }
 
 function App() {
-    const [showClock, setShowClock] = React.useState(true);
+    const [show,setShow] = React.useState(true);
     
 	return (
 		<>
-			<h1>Домашнее задание: жизненый цикл</h1>
+			<h1>Таймер с классом</h1>
-            <button onClick={()=> setShowClock(!showClock)}>
+            <button onClick={()=>setShow(prev => !prev)}>{show ? 'Скрыть' : 'Показать'} таймер</button>
-                {showClock ? 'Скрыть часы' : 'Показать часы' }
+            {show && <Timer />}
-            </button>
-            {showClock && <RandomUser />}
 		</>
 	)
 }