React Hooks 연습하기
import React, { useState, useEffect } from "react";
const useScroll = () => {
const [state, setState] = useSTate({y: 0, x: 0})
const onScroll = () => {
setState({ y: window.scrollY, x: window.scrollX })
};
useEffect(()=>{
window.addEventListener('scroll', onScroll);
return () => window.removeEventListener('scroll', onScroll);
}, [])
return state;
}
const App1 =() =>{
const { y } = useScroll();
return(
<div style ={{height:"1000vh"}}>
<h1 style = {{ position : "fixed", color: y> 150 ? green : red}}>
Hello, Strangers!
</h1>
</div>
)
}
export default App1;
6. 결과물