Navbar与Footer无法占满宽度的技术求助

你的问题根源在于Bootstrap容器类的嵌套使用错误：

• 你将navbar放在了container类的div内部，而Bootstrap的container默认带有左右内边距，导致navbar被限制在这个容器的宽度内，无法铺满全屏。
• 外层的section.row虽然带有负margin，但无法抵消内层container的内边距限制。

修复方案1：替换内层容器为container-fluid #

将nav内部的<div class="container navigation_bar">改为<div class="container-fluid navigation_bar">，这样容器会自适应全屏宽度，没有左右内边距：

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

<section id="title" class="row">
  <div class="container-fluid">
    <nav class="navbar navbar-expand-lg navbar-dark">
      <!-- 替换container为container-fluid -->
      <div class="container-fluid navigation_bar">
        <a class="navbar-brand navbar-dark brand_logo"></a>
        
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
        
        <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
          <ul class="navbar-nav ms-auto">
            <li class="nav-item">
              <a class="nav-link" href="index.html">Home</a>
            </li>
            
            <li class="nav-item dropdown">
              <a class="nav-link" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                Explore
              </a>
            </li>
          </ul>
        </div>
    </nav>
    </div>
</section>

修复方案2：移除内层容器 #

如果不需要额外的容器包裹navbar内容，可以直接删除<div class="container navigation_bar">，让navbar直接使用父级container-fluid的宽度：

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

<section id="title" class="row">
  <div class="container-fluid">
    <nav class="navbar navbar-expand-lg navbar-dark">
        <a class="navbar-brand navbar-dark brand_logo"></a>
        
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
        
        <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
          <ul class="navbar-nav ms-auto">
            <li class="nav-item">
              <a class="nav-link" href="index.html">Home</a>
            </li>
            
            <li class="nav-item dropdown">
              <a class="nav-link" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                Explore
              </a>
            </li>
          </ul>
        </div>
    </nav>
    </div>
</section>

额外检查点 #

• 确保你的body元素没有自定义的左右margin，如果有，添加CSS：body { margin: 0; }
• Footer的问题可以用同样的逻辑处理：避免将Footer放在带有左右内边距的container里，改用container-fluid或直接移除外层限制容器。

内容的提问来源于stack exchange，提问作者Batman2.0