수업 따라 그대로 진행했는데 버튼을 눌러도 반응을 하지않아요

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수업 따라 그대로 진행했는데 버튼을 눌러도 반응을 하지않아요

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javascript로딩후 실행을 복사해서 <style></style>탭밑에 <script>에 복사 붙여넣기 하여도

localhost:5000 저장하기 버튼을 눌러도 무응답입니다 ㅠ

<!doctype html>
<html lang="en">

<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
          integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
            integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
            crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
            integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
            crossorigin="anonymous"></script>

    <title>스파르타코딩클럽 | 부트스트랩 연습하기</title>
        <link rel="preconnect" href="https://fonts.googleapis.com">
        <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
        <link href="https://fonts.googleapis.com/css2?family=Black+Han+Sans&family=Hi+Melody&family=Nanum+Pen+Script&display=swap"
              rel="stylesheet">

    <style>
        .container {
            width: 500px;
            margin-top: 20px;

        }

        .wrap {
            width: 900px;
            margin: auto;
        }

        * {
            font-family: 'Black Han Sans', sans-serif;
        }

    </style>
    <script>
        $(document).ready(function () {
            alert('안녕!')
        })
    </script>

</head>

<body>
<div class="wrap">
    <div class="jumbotron jumbotron-fluid">
        <div class="container">
            <h1>나홀로 일기장</h1>
            <div>
                <div class="form-group">
                    <input type="email" class="form-control" id="exampleFormControlInput1"
                           placeholder="사진 제목">
                </div>
                <div class="form-group">
                    <textarea class="form-control" id="exampleFormControlTextarea1" rows="3"
                              placeholder="사진 내용"></textarea>
                </div>
                <button type="저장하기" class="btn btn-primary">저장하기</button>
            </div>
        </div>

    </div>
    <div class="card-columns">
        <div class="card">
            <!--        <img class="card-img-top" src="..." alt="Card image cap">-->
            <div class="card-body">
                <h5 class="card-title">창덕궁</h5>
                <p class="card-text">날씨가 참 좋았다.</p>
            </div>
        </div>
        <div class="card">
            <!--        <img class="card-img-top" src="..." alt="Card image cap">-->
            <div class="card-body">
                <h5 class="card-title">창덕궁</h5>
                <p class="card-text">날씨가 참 좋았다.</p>
            </div>
        </div>
        <div class="card">
            <!--        <img class="card-img-top" src="..." alt="Card image cap">-->
            <div class="card-body">
                <h5 class="card-title">창덕궁</h5>
                <p class="card-text">날씨가 참 좋았다.</p>
            </div>
        </div>
        <div class="card">
            <!--        <img class="card-img-top" src="..." alt="Card image cap">-->
            <div class="card-body">
                <h5 class="card-title">창덕궁</h5>
                <p class="card-text">날씨가 참 좋았다.</p>
            </div>
        </div>
        <div class="card">
            <!--        <img class="card-img-top" src="..." alt="Card image cap">-->
            <div class="card-body">
                <h5 class="card-title">창덕궁</h5>
                <p class="card-text">날씨가 참 좋았다.</p>
            </div>
        </div>
        <div class="card">
            <!--        <img class="card-img-top" src="..." alt="Card image cap">-->
            <div class="card-body">
                <h5 class="card-title">창덕궁</h5>
                <p class="card-text">날씨가 참 좋았다.</p>
            </div>
        </div>


    </div>
</div>

</body>

</html>

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