버튼을 누르면 글자가 보였다 사라지는 코드
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
class A extends React.Component{
redner(){
return(
<>
{this.props.name}
<button onClick={this.props.hide}>hide</button>
</>
)
}
}
class B extends React.Component{
render(){
return (
<>
<A name={this.props.text} hide={this.props.hide}/>
</>
)
}
}
class C extends React.Component{
render(){
return(
<>
<B text={this.props.value} hide={this.props.hide}/>
</>
)
}
}
class App extends React.Component{
constructor(props){
super(props)
this.state = {
txt:'hello world',
isShow:false,
}
}
handleClick = () => {
this.setState({isShow:true})
}
hideClick = () => {
this.setState({isShow:false})
}
render(){
return(
<>
{this.state.isShow ? <C value={this.state.txt} hide={this.hideClick}/>:<button onClick={this.handleClick}>show</button>}
</>
)
}
}
ReactDOM.render(
<App/>,
document.querySelector('#root')
)
</script>
</body>
</html>
안녕하세요