reactEvents.jsx

class Button extends React.Component {
    constructor(props) {
        super(props);
        this.onMouseMove = this.onMouseMove.bind(this);
    }
 
    render() {
        return (
            <button
                onMouseOver={this.onMouseOver}
                onMouseDown={() => this.onMouseDown()}
                onMouseUp={this.onMouseUp.bind(this)}
                onMouseMove={this.onMouseMove}
                onClick={this.onClick}
            >Butt</button>
        );
    }
 
    onMouseOver(event) { console.log(event, this); }
    onMouseDown(event) { console.log(event, this); }
    onMouseUp(event) { console.log(event, this); }
    onMouseMove(event) { console.log(event, this); }
    onClick = (event) => { console.log(event, this); }
}