html - Bootstrap 4 - 如何为不同的屏幕尺寸重新定位一些导航栏元素

Question

因此，我使用 bootstrap 4 创建了一个导航栏，当屏幕太小时，它会折叠成一个按钮。当它没有折叠时，导航栏以完美的顺序设置。但是，当它确实折叠在按钮后面时，一个元素(图标图像)居中，而其余元素则在左侧。只有当导航栏折叠时(就像其他元素一样)，我怎样才能让图标向左移动。

我试过在图标图像上执行“float-md-left”，但是没有做出任何改变。

<!--Navbar-->
        <nav class="navbar navbar-expand-lg navbar-dark bg-dark mx-auto">
            <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" id="navbarSupportedContent">
                <ul class="navbar-nav mx-auto">
                    <li class="nav-item active">
                        <a class="nav-link" href="#">The Party<span class="sr-only">(current)</span></a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Current Stadium</a>
                    </li>

                    <a class="navbar-brand mx-auto float-sm-left" href="#"><i class="fas fa-football-ball"></i></a>

                    <li class="nav-item">
                        <a class="nav-link" href="#">RSVP</a>
                    </li>
                    <li class="nav-item dropdown">
                        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            Stadium History
                        </a>
                        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                            <a class="dropdown-item" href="#">2017 Stadium</a>
                            <a class="dropdown-item" href="#">2018 Stadium</a>
                            <a class="dropdown-item" href="#">2019 Stadium</a>
                        </div>
                    </li>
                </ul>
            </div>
        </nav>

Answer 1

我明白了。这要归功于 mx-auto 类。

应用mx-auto类有什么具体原因吗？否则，您可以自行删除。

另外，请删除 float 类。

请看下面的代码。

<a class="navbar-brand mx-lg-auto" href="#"><i class="fas fa-football-ball"></i></a>

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                <span class="navbar-toggler-icon"></span>
            </button>

            <div class="collapse navbar-collapse" id="navbarSupportedContent">
                <ul class="navbar-nav mx-auto">
                    <li class="nav-item active">
                        <a class="nav-link" href="#">The Party<span class="sr-only">(current)</span></a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Current Stadium</a>
                    </li>

                    <a class="navbar-brand mx-lg-auto" href="#"><i class="fas fa-football-ball"></i></a>

                    <li class="nav-item">
                        <a class="nav-link" href="#">RSVP</a>
                    </li>
                    <li class="nav-item dropdown">
                        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            Stadium History
                        </a>
                        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                            <a class="dropdown-item" href="#">2017 Stadium</a>
                            <a class="dropdown-item" href="#">2018 Stadium</a>
                            <a class="dropdown-item" href="#">2019 Stadium</a>
                        </div>
                    </li>
                </ul>
            </div>
        </nav>
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