update example

Terry-Su · Jun 24, 2021 · edd10b4 · edd10b4
1 parent 85e377a
commit edd10b4
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/react-16.13.1/index.js b/react-16.13.1/index.js
@@ -1,5 +1,10 @@
 function App() {
-    return <div>Hello, React Source Code!</div>
+    const [count, setCount] = React.useState(0)
+    return <div>
+        <div>Hello, React Source Code!</div>
+        <div>Number: {count}</div>
+        <button onClick={() => setCount(v => v + 1)}>Increment</button>
+    </div>
 }
 
 ReactDOM.render(<App/>, document.querySelector('#app'))