useeffect in class code example
Example 1: setting className using useEffect
useEffect(() => {
document.body.className = 'signin';
return () => { document.body.className = ''; }
});
Example 2: useeffect react
useEffect(() => {
window.addEventListener('mousemove', () => {});
return () => {
window.removeEventListener('mousemove', () => {})
}
}, [])
Example 3: useeffect
import React, { useState, useEffect } from 'react';
function Example() {
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}