Bootstrap 4网格在UL内部无法正常工作

Question

我正在尝试使用bootstrap 4网格系统创建一个巨大的下拉菜单，无论我对col做了什么，它都不会并排浮动。请给我一个灯！谢谢

        <nav class="navbar navbar-expand-lg navbar-light bg-light">
      <a class="navbar-brand" href="#">Test</a>
      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
      <div class="collapse navbar-collapse container-fluid" id="navbarSupportedContent">
            <ul class="navbar-nav mr-auto">
                <li id="menu-item-24" class="dropdown">
                    <a href="#" class="nav-link dropdown-toggle" data-toggle="dropdown">Borrow</a>
                    <ul class="dropdown-menu row">
                        <li class="col-sm-3 ">
                            <ul>
                                <li id="menu-item-29" class="dropdown-item"><a href="#" class="nav-link">0</a></li>
                            </ul>
                        </li>
                        <li class=" col-sm-3 ">
                            <ul>
                                <li id="menu-item-49" class="dropdown-item"><a href="#" class="nav-link">1</a></li>
                            </ul>
                        </li>
                        <li class=" col-sm-3 ">
                            <ul>
                                <li id="menu-item-52" class="dropdown-item"><a href="#" class="nav-link">2</a></li>
                            </ul>
                        </li>
                        <li class=" col-sm-3 ">
                            <ul>
                                <li id="menu-item-55" class="dropdown-item"><a href="#" class="nav-link">3</a></li>
                            </ul>
                        </li>
                    </ul>
                </li>
</ul>

      </div>
    </nav>

Answer 1

使用此Css并定义固定宽度

.dropdown-menu.show {
display: flex;
}

固定宽度下拉菜单

.navbar-expand-lg .navbar-nav .dropdown-menu {
min-width: 900px !important;
left: 0;
}