reactintro/15.effect.html at master · linyutg/reactintro · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>effect</title>
    <meta charset="utf-8" />
    <style>
      body {
        font-family: -apple-system, sans-serif;
      }
    </style>
  </head>
  <body>
    <div id="app"></div>
    <script src="react/react.js"></script>
    <script src="react/react-dom.js"></script>
    <script src="react/babel.js"></script>
    <script type="text/babel">
      const { useState, useEffect } = React;

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

        useEffect(() => {
          // Update the document title using the browser API
          document.title = `You clicked ${count} times`;
        }, [count]);

        return (
          <div>
            <p>You clicked {count} times</p>
            <button onClick={() => setCount(count + 1)}>Click me</button>
          </div>
        );
      }

      ReactDOM.render(<Example />, document.getElementById("app"));
    </script>
  </body>
</html>