这是一个使用Bootstrap 4.2创建的导航栏，包含带有下拉菜单的导航链接和一个集成的搜索框。当鼠标悬停在菜单链接上时，背景颜色会变为#337ab7。导航栏右侧设有搜索表单，包含一个输入框和一个搜索按钮，输入框带有图标装饰并设置有占位符文本。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" href="css/bootstrap.css" />
<style>
div>form>ul>.list>a:hover{
background: #337ab7;
}
</style>
</head>
<body>
<script type="text/javascript" src="js/jquery-1.11.0.js" ></script>
<script type="text/javascript" src="js/bootstrap.js" ></script>
<div class="container">
<form class="navbar-form navbar-left">
<ul class="nav nav-tabs">
<li class="dropdown list">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
首页
</a>
<ul class="dropdown-menu">
<li class="active">
<a href="#">菜单一</a>
</li>
<li>
<a href="#">菜单二</a>
</li>
</ul>
</li>
<li class="dropdown list">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
官网
</a>
<ul class="dropdown-menu">
<li class="active">
<a href="#">菜单三</a>
</li>
<li>
<a href="#">菜单四</a>
</li>
</ul>
</li>
<li class="dropdown list">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
关于
</a>
<ul class="dropdown-menu">
<li class="active">
<a href="#">菜单五</a>
</li>
<li>
<a href="#">菜单六</a>
</li>
</ul>
</li>
</ul>
</form>
<form class="navbar-form navbar-right">
<div class="form-group">
<div class="input-group">
<div class="input-group-addon">
<i class="glyphicon glyphicon-search"></i>
</div>
<input type="text" class="form-control" placeholder="搜索" />
</div>
</div>
<button type="button" class="btn btn-danger">搜索</button>
</form>
</div>
</body>
</html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" href="css/bootstrap.css" />
<style>
div>form>ul>.list>a:hover{
background: #337ab7;
}
</style>
</head>
<body>
<script type="text/javascript" src="js/jquery-1.11.0.js" ></script>
<script type="text/javascript" src="js/bootstrap.js" ></script>
<div class="container">
<form class="navbar-form navbar-left">
<ul class="nav nav-tabs">
<li class="dropdown list">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
首页
</a>
<ul class="dropdown-menu">
<li class="active">
<a href="#">菜单一</a>
</li>
<li>
<a href="#">菜单二</a>
</li>
</ul>
</li>
<li class="dropdown list">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
官网
</a>
<ul class="dropdown-menu">
<li class="active">
<a href="#">菜单三</a>
</li>
<li>
<a href="#">菜单四</a>
</li>
</ul>
</li>
<li class="dropdown list">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
关于
</a>
<ul class="dropdown-menu">
<li class="active">
<a href="#">菜单五</a>
</li>
<li>
<a href="#">菜单六</a>
</li>
</ul>
</li>
</ul>
</form>
<form class="navbar-form navbar-right">
<div class="form-group">
<div class="input-group">
<div class="input-group-addon">
<i class="glyphicon glyphicon-search"></i>
</div>
<input type="text" class="form-control" placeholder="搜索" />
</div>
</div>
<button type="button" class="btn btn-danger">搜索</button>
</form>
</div>
</body>
</html>
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