const {useEffect, useState} = React

function TestEffect() {
  const [data, setData] = useState(0)
  useEffect(() => {
    console.log("useEffect")
  }, [data])
  
  const handleClick = () => {
    let temp = data
    setData(++temp)
  }
  
  return (
    <div>
      <div>{data}</div>
      <button onClick={handleClick}>change data</button>
    </div>
  )
}

ReactDOM.render(<TestEffect />, document.getElementById("root"))