i dont know why click event is not firing.can anyone help me please

enter image description here
can anyone solve thisenter image description here

>Solution :

I checked your code and I fixed the problems:

import React, { Component } from 'react';

export default class Classcompo extends Component {
  constructor(props) {
    super(props);
    this.state = {
      message: 'welcome visitors',
    };
  }
  changeMessage() {
    this.setState({
      message: 'ok',
    });
  }
  render() {
    return (
      <div>
        <h1>{this.state.message}</h1>
        <button onClick={() => this.changeMessage()}>CLICK</button>
      </div>
    );
  }
}