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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Title</title>
<script src="https://code.jquery.com/jquery-3.7.0.min.js"></script>
<style>
</style>
</head>
<body>
<div>
<label>아이디
<input type="text" id = "userid", name = "userid">
</label>
</div>
</body>
<script>
$("#userid").on("change",()=>{
alert($("#userid").val());
})
</script>
</html>
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