我遇到的问题是我的下拉菜单无效。就像有时当我在我的css或html中更改某些内容并刷新页面时，它会工作一次，但之后再也不会。不能为我的生活找出原因。我指的是带有nav navbar-nav pull-right类的ul。
希望能帮助你们的大脑寻求帮助。
以下是我的网页代码：
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Website Title & Description for Search Engine purposes -->
<title></title>
<meta name="Richmond Movie Club" content="">
<!-- Mobile viewport optimized -->
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<!-- Bootstrap CSS -->
<link href="bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="includes/css/bootstrap-glyphicons.css" rel="stylesheet">
<!-- Font Awesome CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- Custom CSS -->
<link href="includes/css/styles.css" rel="stylesheet">
<!-- Include Modernizr in the head, before any other Javascript -->
<script src="includes/js/modernizr-2.6.2.min.js"></script>
</head>
<body>
<div class="navbar navbar-fixed-top navbar-inverse">
<div class="container">
<button class="navbar-toggle" data-target=".navbar-responsive-collapse" data-toggle="collapse" type="button">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<!-- end responsive-dropdown -->
<a href="index.php" class="navbar-brand">RichmondMC</a>
<div class="nav-collapse collapse navbar-responsive-collapse">
<ul class="nav navbar-nav">
<li><a href="movieDatabase.php">Movie Database</a></li>
<li><a href="gallery.php">Gallery</a></li>
<li><a href="ratings.php">Ratings</a></li>
</ul>
<!-- end navbar-nav -->
<ul class="nav navbar-nav pull-right">
<li class="dropdown">
<a href="" class="dropdown-toggle" data-toggle="dropdown"><span class="glyphicon glyphicon-user"></span> My Account <strong class="caret"></strong></a>
<ul class="dropdown-menu">
<li><a href="#"><span class="glyphicon glyphicon-wrench"></span> Settings</a></li>
<li><a href="#registerModal" role="button" data-toggle="modal"><span class="glyphicon glyphicon-list-alt"></span> Register New User</a></li>
<li class="divider"></li>
<li><a href="login.php"><span class="glyphicon glyphicon-play"></span> Sign In</a></li>
<li><a href="#"><span class="glyphicon glyphicon-off"></span> Sign Out</a></li>
</ul>
<!-- end dropdown-menu -->
</li>
<!-- end dropdown -->
</ul>
<!-- end myAccount-dropdown -->
</div>
<!-- end nav-collapse -->
</div>
<!-- end container -->
</div>
<!-- end navbar -->
<div class="modal fade" id="registerModal">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<a href="#" class="close" data-dismiss="modal">×</a>
<h4 class="modal-title"><span class="glyphicon glyphicon-th-list"></span> New User Registration </h4>
</div>
<!-- end modal-header -->
<div class="modal-body">
<h5>Enter the New Members details including username/password to complete registration</h5><br>
<form action="" class="form-horizontal">
<div class="form-group">
<label for="username" class="col-lg-4 control-label">Username:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="username" placeholder="Username" required>
</div>
</div>
<div class="form-group">
<label for="password" class="col-lg-4 control-label">Password:</label>
<div class="col-lg-8">
<input type="password" class="form-control" id="password" placeholder="Password" required>
</div>
</div>
<div class="form-group">
<label for="firstName" class="col-lg-4 control-label">First Name:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="firstName" placeholder="First Name" required>
</div>
</div>
<div class="form-group">
<label for="lastName" class="col-lg-4 control-label">Last Name:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="lastName" placeholder="Last Name" required>
</div>
</div>
<div class="form-group">
<label for="emailAddress" class="col-lg-4 control-label">Email Address:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="emailAddress" placeholder="Email Address" required>
</div>
</div>
<div class="form-group">
<label for="phoneNumber" class="col-lg-4 control-label">Phone Number:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="phoneNumber" placeholder="Phone Number" required>
</div>
</div>
<button class="btn btn-success pull-right" type="submit" id="alertMe">Submit</button><br>
</form>
<!-- end form -->
</div>
<!-- end modal-body -->
<div class="modal-footer">
<div class="alert alert-success alert-block fade in" id="successAlert">
<button class="close" type="button" data-dismiss="alert" aria-label="close"><span aria-hidden="true">×</span></button>
<h4>Success!</h4>
<p>New user registered successfully</p>
</div><!-- end alert -->
</div>
</div>
<!-- end modal-content -->
</div>
<!-- end modal-dialog -->
</div>
<!-- end modal -->
<!-- All Javascript at the bottom of the page for faster page loading -->
<!-- First try for the online version of jQuery-->
<script src="http://code.jquery.com/jquery.js"></script>
<!-- If no online access, fallback to our hardcoded version of jQuery -->
<script>
window.jQuery || document.write('<script src="includes/js/jquery-1.8.2.min.js"><\/script>')
</script>
<!-- Bootstrap JS -->
<script src="bootstrap/js/bootstrap.min.js"></script>
<!-- Custom JS -->
<script src="includes/js/script.js"></script>
</body>
</html>
修改的
忘记包含这些是.php文件。
这是我的header.php，我把它包含在我的所有页面中
<?php include "header.php" ?>
如果这有任何区别。
答案 0 :(得分：1)
在以下代码段中工作正常。您的自定义css或js文件中必定存在一些问题，这会出现在下拉列表中。
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Website Title & Description for Search Engine purposes -->
<title></title>
<meta name="Richmond Movie Club" content="">
<!-- Mobile viewport optimized -->
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<!-- Bootstrap CSS -->
<link href="bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="includes/css/bootstrap-glyphicons.css" rel="stylesheet">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<!-- Font Awesome CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!-- Custom CSS -->
<link href="includes/css/styles.css" rel="stylesheet">
<!-- Include Modernizr in the head, before any other Javascript -->
<script src="includes/js/modernizr-2.6.2.min.js"></script>
</head>
<body>
<div class="navbar navbar-fixed-top navbar-inverse">
<div class="container">
<button class="navbar-toggle" data-target=".navbar-responsive-collapse" data-toggle="collapse" type="button">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<!-- end responsive-dropdown -->
<a href="index.php" class="navbar-brand">RichmondMC</a>
<div class="nav-collapse collapse navbar-responsive-collapse">
<ul class="nav navbar-nav">
<li><a href="movieDatabase.php">Movie Database</a></li>
<li><a href="gallery.php">Gallery</a></li>
<li><a href="ratings.php">Ratings</a></li>
</ul>
<!-- end navbar-nav -->
<ul class="nav navbar-nav pull-right">
<li class="dropdown">
<a href="" class="dropdown-toggle" data-toggle="dropdown"><span class="glyphicon glyphicon-user"></span> My Account <strong class="caret"></strong></a>
<ul class="dropdown-menu">
<li><a href="#"><span class="glyphicon glyphicon-wrench"></span> Settings</a></li>
<li><a href="#registerModal" role="button" data-toggle="modal"><span class="glyphicon glyphicon-list-alt"></span> Register New User</a></li>
<li class="divider"></li>
<li><a href="login.php"><span class="glyphicon glyphicon-play"></span> Sign In</a></li>
<li><a href="#"><span class="glyphicon glyphicon-off"></span> Sign Out</a></li>
</ul>
<!-- end dropdown-menu -->
</li>
<!-- end dropdown -->
</ul>
<!-- end myAccount-dropdown -->
</div>
<!-- end nav-collapse -->
</div>
<!-- end container -->
</div>
<!-- end navbar -->
<div class="modal fade" id="registerModal">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<a href="#" class="close" data-dismiss="modal">×</a>
<h4 class="modal-title"><span class="glyphicon glyphicon-th-list"></span> New User Registration </h4>
</div>
<!-- end modal-header -->
<div class="modal-body">
<h5>Enter the New Members details including username/password to complete registration</h5><br>
<form action="" class="form-horizontal">
<div class="form-group">
<label for="username" class="col-lg-4 control-label">Username:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="username" placeholder="Username" required>
</div>
</div>
<div class="form-group">
<label for="password" class="col-lg-4 control-label">Password:</label>
<div class="col-lg-8">
<input type="password" class="form-control" id="password" placeholder="Password" required>
</div>
</div>
<div class="form-group">
<label for="firstName" class="col-lg-4 control-label">First Name:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="firstName" placeholder="First Name" required>
</div>
</div>
<div class="form-group">
<label for="lastName" class="col-lg-4 control-label">Last Name:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="lastName" placeholder="Last Name" required>
</div>
</div>
<div class="form-group">
<label for="emailAddress" class="col-lg-4 control-label">Email Address:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="emailAddress" placeholder="Email Address" required>
</div>
</div>
<div class="form-group">
<label for="phoneNumber" class="col-lg-4 control-label">Phone Number:</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="phoneNumber" placeholder="Phone Number" required>
</div>
</div>
<button class="btn btn-success pull-right" type="submit" id="alertMe">Submit</button><br>
</form>
<!-- end form -->
</div>
<!-- end modal-body -->
<div class="modal-footer">
<div class="alert alert-success alert-block fade in" id="successAlert">
<button class="close" type="button" data-dismiss="alert" aria-label="close"><span aria-hidden="true">×</span></button>
<h4>Success!</h4>
<p>New user registered successfully</p>
</div><!-- end alert -->
</div>
</div>
<!-- end modal-content -->
</div>
<!-- end modal-dialog -->
</div>
<!-- end modal -->
<!-- All Javascript at the bottom of the page for faster page loading -->
<!-- First try for the online version of jQuery-->
<script src="http://code.jquery.com/jquery.js"></script>
<!-- If no online access, fallback to our hardcoded version of jQuery -->
<script>
window.jQuery || document.write('<script src="includes/js/jquery-1.8.2.min.js"><\/script>')
</script>
<!-- Bootstrap JS -->
<script src="bootstrap/js/bootstrap.min.js"></script>
<!-- Custom JS -->
<script src="includes/js/script.js"></script>
</body>
</html>