我正在尝试使用 bootstrap 发出警报，但它不起作用。在 mozilla firebug 控制台中显示
ReferenceError: $ is not defined
$('#openAlert').click(function () {
代码如下。我可以知道缺少什么吗。我包括 jquery 以及 bootstrap js 文件。
<head>
<title>Twilio Messages (Send message Example)</title>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="http://getbootstrap.com/2.3.2/assets/css/bootstrap.css" rel="stylesheet">
<link href="http://getbootstrap.com/2.3.2/assets/css/bootstrap-responsive.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row">
<div class="span12">
<h2>Twilio Messages (Send message Example)</h2>
<form class="form-signin" action="#Twilio" method="post">
<div class="row">
<div class="span3">
Enter Number to send:
</div>
<div class="span3">
<input type="text" name="toNumber" maxlength="10" placeholder="Enter 10 digits number to send" value="+16822037149"/>
</div>
<div class="span6">
<div class="alert">
<button type="button" class="close" data-dismiss="alert">×</button>
The number to send an SMS to. This field accepts formatted and unformatted US numbers, e.g. +14155551212, (415) 555-1212 or 415-555-1212.<hr />
To send message from SandBox Account. The Number has to be <a href="https://www.twilio.com/user/account/phone-numbers/verified" target="_blank">verified</a>
</div>
</div>
</div>
<div class="row">
<div class="span3">
Enter Message to send:
</div>
<div class="span3">
<textarea name="body" maxlength="160" placeholder="Enter message to send">
</textarea>
</div>
<div class="span6">
<div class="alert">
<button type="button" class="close" data-dismiss="alert">×</button>
The text of the message you want to send, limited to 160 characters.
</div>
</div>
</div>
<div class="row">
<div class="span3">
</div>
<div class="span9">
<button class="btn" type="submit" id="openAlert">Send</button>
</div>
</div>
</form>
</div>
</div>
<div id="le-alert" class="alert alert-warn alert-block fade">
<button href="#" type="button" class="close">×</button>
<h4>Alert title</h4>
<p>Roses are red, violets are blue...</p>
</div>
</div>
<script type="text/javascript">
$('#openAlert').click(function () {
$('#le-alert').addClass('in'); // shows alert with Bootstrap CSS3 implem
});
$('.close').click(function () {
$(this).parent().removeClass('in'); // hides alert with Bootstrap CSS3 implem
});
</script>
</body>
<script type="text/javascript" src="https://code.jquery.com/jquery.min.js"></script>
<script type="text/javascript" src="http://getbootstrap.com/2.3.2/assets/js/bootstrap.js"></script>
</html>
最佳答案
将您的脚本包含到 <head></head>然后使用 alert()或者你正在做的任何图书馆调用，
在加载库之前调用库函数
$('#openAlert').click(function () {
$('#le-alert').addClass('in'); //
.................
应该在*之后*
<script type="text/javascript" src="https://code.jquery.com/jquery.min.js"></script>
<script type="text/javascript" src="http://getbootstrap.com/2.3.2/assets/js/bootstrap.js"></script>
记住: 您需要先包含 JS 库，然后才能使用函数，因为 $ 是要初始化的
关于javascript - Bootstrap 警报不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19491892/