index.js
import React from 'react'
import ReactDOM from 'react-dom'
class Btn extends React.Component {
render() {
return <button onClick={() => alert('click')}>click</button>
}
}
ReactDOM.render(<Btn />, document.getElementById('root'))
index.js
import React from 'react'
import ReactDOM from 'react-dom'
class Btn extends React.Component {
render() {
return <button onClick={() => alert('click')}>click</button>
}
}
ReactDOM.render(<Btn />, document.getElementById('root'))