React Basic Hooks - useEffects sample

by 1004lucifer

HTML

<div id="root"></div>
<div id="other-div"></div>

CSS

body {
  height: 100vh;
  font-family: 'Open Sans', sans-serif;
  font-weight: bold;
  font-size: 24px;
  display: flex;
  justify-content: center;
  align-content: center;
  flex-wrap: wrap;
  text-align: center
}

#root, #other-div {
  width: 100%;
}

React

const {useState, useEffect} = React;

function Example() {
  const [count, setCount] = useState(0);

  // Similar to componentDidMount and componentDidUpdate:  
  useEffect(() => {   
  	// Update the document title using the browser API    
  	document.getElementById('other-div').innerHTML = `You clicked ${count} times`;  
    var intervalId = setInterval(() => {
    	console.log('1111');
      setCount(count + 1);
    }, 1000);
  }, []);
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

ReactDOM.render( <Example />, document.getElementById('root') );