我的按钮已设置为位置：固定在页面右侧。单击时，它应该打开模态，但是单击时不会做任何事情。
如果我删除了位置：修复了它的工作正常，模态显示了，但是这不是我想要的，因为它需要固定在侧面
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<script type="text/javascript" src="https://netdna.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.3.0/css/font-awesome.min.css"
rel="stylesheet" type="text/css">
<link href="https://pingendo.github.io/pingendo-bootstrap/themes/default/bootstrap.css"
rel="stylesheet" type="text/css">
</head>
<body>
<div class="navbar navbar-default navbar-static-top" style="height:80px;background-color:white;border-bottom:0px;">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar-ex-collapse">
<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" style="padding-top:0px;"><img height="75" alt="Brand" src="logo260x80-2.png"></a>
</div>
<div class="collapse navbar-collapse" id="navbar-ex-collapse" style="border-top:0px;border-bottom:0px;">
<ul class="nav navbar-nav navbar-right" style="padding-top:20px;border-top:0px;border-bottom:0px;">
<li class="active">
<a href="#">Home</a>
</li>
<li>
<a href="#">Contacts</a>
</li>
</ul>
</div>
</div>
</div>
<div class="section">
<div class="background-image" style="background-image : url('headerbg3.jpg');"></div>
<div class="container">
<div class="row">
<div class="col-md-12" style="height:200px;"></div>
</div>
</div>
</div>
<button data-toggle="modal" data-target="#demo" type="button" style="position:fixed;right:0px;"
tab-index="1" id="showmodal" class="btn btn-lg btn-success">
<i class="fa fa-envelope fa-2x"></i>
</button>
<div class="section">
<div class="container">
<div class="row">
<div class="col-md-12">
<h1 class="text-center">Gallery</h1>
</div>
</div>
<div class="row">
<div class="col-md-4">
<a><img src="http://pingendo.github.io/pingendo-bootstrap/assets/placeholder.png" class="img-responsive"></a>
<h3>A title</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, </p>
</div>
<div class="col-md-4">
<a><img src="http://pingendo.github.io/pingendo-bootstrap/assets/placeholder.png" class="img-responsive"></a>
<h2>A title</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, </p>
</div>
<div class="col-md-4">
<a><img src="http://pingendo.github.io/pingendo-bootstrap/assets/placeholder.png" class="img-responsive"></a>
<h2>A ttile</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, </p>
</div>
</div>
<div class="row">
<div class="col-md-4">
<a><img src="http://pingendo.github.io/pingendo-bootstrap/assets/placeholder.png" class="img-responsive"></a>
<h3>A title</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, </p>
</div>
<div class="col-md-4">
<a><img src="http://pingendo.github.io/pingendo-bootstrap/assets/placeholder.png" class="img-responsive"></a>
<h3>A title</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, </p>
</div>
<div class="col-md-4">
<a><img src="http://pingendo.github.io/pingendo-bootstrap/assets/placeholder.png" class="img-responsive"></a>
<h2>A title</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisici elit, </p>
</div>
</div>
</div>
</div>
<div class="modal fade" id="demo" tabindex="-1" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Modal title</h4>
</div>
<div class="modal-body">
<p>One fine body...</p>
</div>
<div class="modal-footer">
<a class="btn btn-default" data-dismiss="modal">Close</a>
<a class="btn btn-primary">Save changes</a>
</div>
</div>
</div>
</div>
</body>
</html>
上面是页面的完整html代码
问题是该按钮隐藏在截面div后面并变得无法拼凑。因此，要使按钮出现在本节之前，我们将z-index:1;样式应用于按钮，代码看起来像：
<button data-toggle="modal" data-target="#demo" type="button" style="z-index:1;position:fixed;right:0px;" tab-index="1" id="showmodal" class="btn btn-lg btn-success">
或JSFIDDLE DEMO。
注意：在这里您可以阅读有关
z-index属性的更多信息。