import React from "react";
import PropTypes from "prop-types"
class App extends React.Component {
state = {
count: 0
};
add = () => {
this.setState({ count: this.state.count + 1});
};
minus = () => {
this.setState({ count: this.state.count - 1});
};
render() {
return
<h1>The number is: {this.state.count}</h1>;
<button onClick={this.add}>Add</button>
<button onClick={this.minus}>Minus</button>
</div>
}
}
export default App;
stateSet을 호출할 때마다 새로운 state와 함께 render function을 호출한다.