
<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8" />
<title>Fetch 시작하기</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
function hey() {
let url = "http://spartacodingclub.shop/sparta_api/seoulair";
fetch(url) then(res => res.json()).then(data => {
console.log(data)
})
}
</script>
</head>
<body>
<button onclick="hey()">fetch 연습!</button>
</body>
</html>

오류가 나는데 왜 그런걸까요??
