Update 11_events.md

11_Day_Events/11_events.md

@@ -100,7 +100,8 @@ However, in React it could be as follows:
 import React, { Component } from 'react'
 // if it is functional components
 class App extends Component {
-  handleClick = () => {
+  handleClick = (e) => {
+    e.preventDefault()
     alert('Welcome to 30 Days Of React Challenge')
   }
   render() {