为什么引入bootstrap没效果?

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="node_modules/bootstrap/dist/css/bootstrap.css">
</head>
<body>
  <div id="app">
      <nav class="navbar navbar-inverse">
          <div class="container-fluid">
              <div class="navbar-header">
                  <a class="navbar-brand" href="#">
                      ToDoList
                  </a>
              </div>
          </div>
      </nav>
  </div>
  <script src="node_modules/axios/dist/axios.js"></script>
<script src="node_modules/vue/dist/vue.js"></script>

</body>
</html>

bootstrap有通过安装到本地,跟着视频中的老师到bootstrap官网上复制导航条代码,但没有效果,请问下什么原因?

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