(asp.net)引导带4导航开关不工作

Question

我在asp.net (.net框架)中使用引导程序4。当我从个人电脑上将网站视图更改为移动视图时，导航开关图标按钮就可以工作了。当我按下切换图标按钮时，导航栏的内容没有显示。导航条折叠标识与数据目标相同，但仍然不起作用，你能帮帮我吗？这是我的代码：

<nav id="navbar" class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
    <div class="container">
        <a class="navbar-brand" href="/index.aspx">
            <img class="logo" src="img/Logo/logo_Rueston.png" alt="">
        </a>
        <button class="navbar-toggler" type="button" data-toggle="navbar-collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarCollapse">
            <ul class="navbar-nav navbar-center ml-auto">
                <li class="nav-item ml-3">
                    <a class="nav-link" href="/index.aspx">Home<span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item ml-3">
                    <a class="nav-link" href="#">About</a>
                </li>
                <li class="nav-item ml-3">
                    <a class="nav-link" href="#">Products</a>
                </li>
                <li class="nav-item ml-3">
                    <a class="nav-link" href="#">Rueston Water</a>
                </li>
            </ul>
            <ul class="navbar-nav ml-auto">

                <li class="nav-item ml-3">
                    <a class="nav-link" href="#">
                        <asp:Label ID="lbLogin" runat="server" Text="Login"></asp:Label>

                    </a>
                </li>
                <li class="nav-item ml-3">
                    <a class="nav-link" href="#">
                        <asp:Label ID="lbSignup" runat="server" Text="SignUp"></asp:Label>

                    </a>
                </li>
            </ul>
        </div>
    </div>
</nav>

下面是演示图片：

在按下切换按钮之前：

按下按钮后

Answer 1

将按钮中的data-toggle="navbar-collapse"更改为data-toggle="collapse"

<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
</button>