DOCTYPE html> $(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"}) }) }) Document focus / blur ID PW focus - 포커스를 받을때 blur - 포커스를 잃을때 발생