Bootstrap导航栏搜索框与按钮无法右对齐问题求助

直接给你修正后的代码，核心是调整搜索表单的布局类来实现右对齐：

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</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" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</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">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <!-- 添加ml-auto类强制表单右对齐 -->
    <form class="form-inline my-2 my-lg-0 ml-auto">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

补充说明： #

• 原代码中navbar-nav mr-auto已经让导航列表占据左侧剩余空间，但添加ml-auto到表单类中，能确保表单始终被推到导航栏右侧，不受其他元素影响。
• 如果需要在导航栏折叠的小屏幕状态下，搜索表单依然右对齐，可以给表单额外添加justify-content-end类：

<form class="form-inline my-2 my-lg-0 ml-auto justify-content-end">

内容的提问来源于stack exchange，提问作者Asim Bhatta