Bootstrap's JavaScript requires jQuery version 1.9.1 or higher,

 

 

 

 

 

<!-- 합쳐지고 최소화된 최신 CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">

<!-- 부가적인 테마 -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap-theme.min.css">

<!-- jquery 로딩 -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

<!-- 합쳐지고 최소화된 최신 자바스크립트 -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>