如何让我的导航栏在手机视图中显示bootstrap 4中被阻止的行？

Question

我是个编程新手。我有下面的代码为我的导航栏，我正在使用django。但它确实在移动视图上崩溃了，但它不会生成积木，这是我打算做的。我在导航栏的各个部分尝试过.d-sm-flex和of sm-10这样的类。我可以在哪里放置一个.d-sm-flex类，这样我的导航栏就会自动成为手机等小屏幕上的字母块。

<div class="container">
  <nav class="navbar navbar-expand-lg navbar-light bg-light">
    <a class="navbar-brand .d-sm-block .d-xs-block" href="{% url 'home:index' %}">  <img src="{% static "images/rainbow.jpg" %}" width="100" height="100" alt=""></a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav">
        {% if user.is_authenticated %}
        <li class="nav-item active">
          <a class="nav-link" href="{% url 'home:about' %}">About Us <span class="sr-only">(current)</span></a>
        </li>
        {% if user.userprofiles %}
          <li class="nav-item">
            <a class="nav-link " href="{% url 'userprofile:profileview' user %}">My Account</a>
      </li>
  <li class="nav-item">
    <a class="nav-link" href="{% url 'postman:inbox' %}">Inbox</a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="{% url 'posts:postshome' %}">Micro Posts</a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="{% url 'userprofile:profilesearch' %}">Search</a>
  </li>
   {% else %}
          <li class="nav-item">
            <a class="nav-link" href="{% url 'userprofile:newprofile' %}">Create New Profile</a>
   {% endif %}  <!-- login/logout dont need namespace app -->
   <li class="nav-item">
    <a class="nav-link" href="{% url 'logout' %}">Logout</a>
        </li>
            {% else %}
        <li class="nav-item active">
          <a class="nav-link" href="{% url 'home:about' %}">About Us <span class="sr-only">(current)</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="{% url 'home:signup' %}">Sign Up</a>
        </li>
        <li class="nav-item">
          <!-- login/logout dont need namespace app -->
          <a class="nav-link" href="{% url 'login' %}">Login</a>
        <li>
          {% endif %}
      </ul>
    </div>
  </nav>

Answer 1

您需要先使用class row才能使用列。尝试在class=-sm-10的父级中添加行“row