클릭 시 state값을 변경하고 싶은 상황 class App extends Component { constructor(props){ super(props); this.state = { mode:'read', subject:{title:'WEB',sub:'World wide web'}, welcome:{title:'welcome', desc:'Hello,React!'}, contents:[ {id:1, title: 'HTML', desc:'html is ...'}, {id:2, title: 'css', desc:'css is ...'}, {id:3, title: 'javaScript', desc:'js is ...'} ] } } render(){ console.log('lendering'); var _ti..