Bootstrap是一種流行的CSS框架，可以幫助開發人員快速、簡單地創建具有響應式設計和漂亮外觀的網站。Bootstrap還提供了各種組件和工具，包括按鈕、表格、表單和導航欄等，可以用于HTML代碼中。以下是一些使用Bootstrap的示例代碼：

<!-- 引入Bootstrap CSS文件 -->
<link rel="stylesheet" >
<!-- 創建一個導航欄 -->
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<div class="container">
<a class="navbar-brand" href="#">Logo</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav me-auto">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</div>
</nav>
<!-- 創建一個表單 -->
<form>
<div class="mb-3">
<label for="exampleInputEmail1" class="form-label">Email address</label>
<input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
<div id="emailHelp" class="form-text">We'll never share your email with anyone else.</div>
</div>
<div class="mb-3">
<label for="exampleInputPassword1" class="form-label">Password</label>
<input type="password" class="form-control" id="exampleInputPassword1">
</div>
<div class="mb-3 form-check">
<input type="checkbox" class="form-check-input" id="exampleCheck1">
<label class="form-check-label" for="exampleCheck1">Check me out</label>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>

上述代碼中，第一個pre標簽包含了引入Bootstrap CSS文件的代碼，以及創建一個導航欄的代碼。第二個pre標簽包含了創建一個表單的代碼?？梢钥吹?，使用Bootstrap可以大大簡化HTML代碼的編寫和樣式的設計，使網站開發更加高效和美觀。