点击它时它不会下降 为什么下拉按钮没有工作？ 我使用了here :
找到的bootstrap导航栏以下是我的代码： 请问你是否需要我的其他任何东西 提前致谢！！
DOCTYPE html>
<head>
<title>Unicity</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Latest compiled and minified CSS -->
<link type="text/css" rel="stylesheet" href="css/bootstrap.css"/>
<link type="text/css" rel="stylesheet" href="css/bootstrap.min.css"/>
<link type="text/css" rel="stylesheet" href="css/bootstrap-theme.css"/>
<link type="text/css" rel="stylesheet" href="css/bootstrap-theme.min.css"/>
<link type="text/css" rel="stylesheet" href="style/style.css"/>
<script src="U:\Desktop\jihad\unicityv1\js\bootstrap.js"></script>
<script src="U:\Desktop\jihad\unicityv1\js\bootstrap.js"></script>
<script src="U:\Desktop\jihad\unicityv1\js\bootstrap.min.js"></script>
<script src="U:\Desktop\jihad\unicityv1\js\npm.js"></script>
</head>
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#"><img src="U:\Desktop\jihad\unicityv1\images\logo1.png" width="110" class="logo"/>
</a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home<span class="sr-only">(current)</span></a></li>
<li><a href="#">Buy Gold</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Sell Gold<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Runescape3</a></li>
<li><a href="#">Oldschool Runecape</a></li>
<li><a href="#">Darkscape</a></li>
</ul>
</li>
</ul>
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="row">
<div class="col-sm-4">
<h3>Saving your money, we are cheap!</h3>
<p>At Unicity we save your money by...</p>
</div>
<div class="col-sm-4">
<h3>Saving your time, we are fast!</h3>
<p> At Unicity we save your time by...</p>
</div>
<div class="col-sm-4">
<h3>Protecting your information, we are secure!</h3>
<p> At Unicity we secure your information are make sure that...</p>
</div>
</div>
</div>
</body>
</html>
答案 0 :(得分：0)
演示：https://jsfiddle.net/1rwdc9os/
添加Jquery库文件。
使用bootstrap.css或bootstrap.min.css和bootstrap.min.js或bootstrap.js
<script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>
答案 1 :(得分：0)
我尝试使用您的代码似乎没有代码问题，似乎找不到正确的CSS和Javascript。试试这个，让我知道。
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"> </script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"> </script>
</head>
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#"><img src="U:\Desktop\jihad\unicityv1\images\logo1.png" width="110" class="logo"/>
</a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home<span class="sr-only">(current)</span></a></li>
<li><a href="#">Buy Gold</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Sell Gold<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Runescape3</a></li>
<li><a href="#">Oldschool Runecape</a></li>
<li><a href="#">Darkscape</a></li>
</ul>
</li>
</ul>
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="row">
<div class="col-sm-4">
<h3>Saving your money, we are cheap!</h3>
<p>At Unicity we save your money by...</p>
</div>
<div class="col-sm-4">
<h3>Saving your time, we are fast!</h3>
<p> At Unicity we save your time by...</p>
</div>
<div class="col-sm-4">
<h3>Protecting your information, we are secure!</h3>
<p> At Unicity we secure your information are make sure that...</p>
</div>
</div>
</div>
答案 2 :(得分：0)
尝试角度......这比其他人更好......
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.names = ["Emil", "Tobias", "Linus"];
});<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<select ng-model="selectedName" ng-options="x for x in names">
</select>
</div>
<p>This example shows how to fill a dropdown list using the ng-options directive.</p>
</body>
</html>