React Js setTimeout Method

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState, useEffect } = React;

function App() {
            const [color, setColor] = useState('red');
            const [text, setText] = useState("Red button");

useEffect(() => {
                const timeoutId = setTimeout(() => {
                    setColor('blue');
                    setText('Blue Button')
                }, 3000);

// Cleanup the timeout when the component unmounts or when the color changes
                return () => clearTimeout(timeoutId);
            }, []);

return (
                <div className="container">
                    <h3>React Js SetTimeout() Method</h3>
                    <p>Button color red turns to blue after 3 seconds</p>
                    <button style={{ backgroundColor: color }}>{text}</button>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        * {
            box-sizing: border-box;
        }

.container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }

h3 {
            font-size: 24px;
            margin-bottom: 10px;
        }

p {
            font-size: 16px;
            margin-bottom: 20px;
        }

button {
            color: white;
            border: none;
            padding: 10px 20px;
            font-size: 18px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

</style>
</body>

</html>

 
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState, useEffect } = React;
​
        function App() {
            const [color, setColor] = useState('red');
            const [text, setText] = useState("Red button");
​
            useEffect(() => {
                const timeoutId = setTimeout(() => {
                    setColor('blue');
                    setText('Blue Button')
                }, 3000);
​
                // Cleanup the timeout when the component unmounts or when the color changes
                return () => clearTimeout(timeoutId);
            }, []);
​
            return (
                <div className="container">
                    <h3>React Js SetTimeout() Method</h3>
                    <p>Button color red turns to blue after 3 seconds</p>
                    <button style={{ backgroundColor: color }}>{text}</button>
                </div>
            );
        }
​
        ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        * {
            box-sizing: border-box;
        }
​
        .container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }
​
        h3 {
            font-size: 24px;
            margin-bottom: 10px;
        }
​
        p {
            font-size: 16px;
            margin-bottom: 20px;
        }
​
        button {
            color: white;
            border: none;
            padding: 10px 20px;
            font-size: 18px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
​
       
    </style>
</body>
​
</html>