screen_rotation
Copied to Clipboard
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> </head> <body> <div id="app"></div> <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script> <script src="https://unpkg.com/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> <script type="text/babel"> const { useEffect } = React; function App() { useEffect(() => { const elements = document.querySelectorAll('.my-class'); const element = elements[1]; // Access the first matched element // Do something with the element if (element) { element.style.color = 'red'; } }, []); return ( <div className='container'> <h3>React Js Get Element by Class Name</h3> <div className="my-class">Element 1</div> <div className="my-class">Element 2</div> <div className="my-class">Element 3</div> </div> ); } ReactDOM.render(<App />, document.getElementById("app")); </script> <style> * { box-sizing: border-box; } .container { margin: 0 auto; width: 500px; 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; } </style> </body> </html>