classArrowOrNormal.js

class Diff extends React.Component {

    constructor(props) {
        super(props);
        this.name = "HaHa!"
    }

    handleArrow = () => {
        console.log(this.name);
    };

    handleNormal() {
        console.log(this.name);
    };

    render() {
        return (
            <div>
                {/* HaHa! */}
                <button onClick={this.handleArrow}>handleArrow</button>
                {/* throw error */}
                <button onClick={this.handleNormal}>handleNormal</button>
            </div>
        );
    }
}