compo.jsx

class Count extends React.Component {
	constructor(){
    	this.state = {
        	count: 0
        }
    }
    
    handleOnClick = ()=>{
    	let count = this.state.count + 1;
    	this.setState({count: count})
    }
	render(){
    	return (
        <div>
        <button onClick={this.handleOnclick}>Inc</butto,>
        {{this.state.count}}
        </div>
        )
    }
}