React map()

//map() Key 綁定

const list=[1,2,3,4,5,6,7]

const  arrayList=list.map((list,index)=>{
  return (
  <li key={index}>
    {list}
  </li>
  )
})


const root = ReactDOM.createRoot(document.getElementById('root'));

root.render( <ul>{arrayList}</ul>);