SOURCE

class Component extends React.Component{
  constructor(props){
    super(props)
    this.state = {text:'haha'}
  }
  
  change = ()=>{
    this.setState({text:!this.state.text})
  }
  
  render(){
    return (
      <div>
        {this.state.text?(<span>yes</span>):(<div>no</div>)}
    <button onClick={this.change}>change</button>
      </div>
    )
  }
}

ReactDOM.render(<Component/>,document.getElementById('app'))

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<div id="app"></div>