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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">
<script src="../js/jquery.min.js"></script>
<style>
</style>
<script>
$(document).ready(function(){
$("#user_id_1,#user_pw_1").on("focus",function(){
$(this).css({"background-color":"grey"})
})
$("#user_id_1,#user_pw_1").on("blur",function(){
$(this).css({"background-color":"#fff"})
})
})
</script>
<title>Document</title>
</head>
<body>
<h1>focus / blur</h1>
<form action="#">
<p>
<label for="user_id_1">ID</label>
<input type="text" id="user_id_1"/>
</p>
<p>
<labe for="user_pw_1">PW</labe>
<input type="password" id="user_pw_1"/>
</p>
</form>
</body>
</html>
focus - 포커스를 받을때
blur - 포커스를 잃을때 발생
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