ReactJs_component_api2

import React from 'react';

import PropTypes from 'prop-types';

import ReactDOM from 'react-dom';

class App extends React.Component {

  constructor(){

    super();

    this.forceUpdateHandler = this.forceUpdateHandler.bind(this);

  };

  forceUpdateHandler(){

    this.forceUpdate();

  };

   render() {

      return (

         <div id = "app">

           <button onClick = {this.setStateHandler}>FORCE UPDATE</button>

           <h4>Random number : {Math.random()}</h4>

            </div>

      );

   }

}

export default App;