我正在使用Framework 7开发一个Web应用程序，在其中，我有它所以菜单是一个从菜单按钮打开的左面板。当菜单打开时，正文具有.with-panel-left-cover类。当发生这种情况时，我一直在尝试将类添加到文档的另一部分，因此我可以添加样式。下面是代码以及我现在要使用的内容。
if ( $('body').hasClass('with-panel-left-cover') ) {
$('.views').addClass( "overlay" );
}
和html（带填充文字）
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no, minimal-ui">
<title>My App</title>
<!-- Font Awesome -->
<link rel="stylesheet" href="links/font-awesome-4.4.0/css/font-awesome.min.css">
<!-- Path to Framework7 Library CSS-->
<link rel="stylesheet" href="dist/css/framework7.ios.min.css">
<link rel="stylesheet" href="dist/css/framework7.ios.colors.min.css">
<!-- Path to your custom app styles-->
<link rel="stylesheet" href="links/css/my-app.css">
<script src="phonegap.js"></script>
</head>
<body>
<div class="statusbar-overlay"></div>
<!-- Panels overlay-->
<div class="panel-overlay"></div>
<!-- Left panel with reveal effect-->
<div class="panel panel-left panel-cover" style="background:lightgray">
<div class="content-block">
<p> <a class="button button-big color-blue button-fill panel-close" href="#index"><i class="fa fa-home fa-lg fa-fw"></i> Step 1</a> </p>
<p> <a class="button button-fill button-big panel-close" href="#about"><i class="fa fa-info fa-lg fa-fw"></i> Step 2/a> </p>
<p> <a class="button button-fill button-big panel-close" href="#form"><i class="fa fa-file fa-lg fa-fw"></i> Step 3</a> </p>
</div>
</div>
<!-- Views-->
<div class="views">
<!-- Your main view, should have "view-main" class-->
<div class="view view-main">
<!-- Top Navbar-->
<div class="navbar">
<!-- Navbar inner for Index page-->
<div data-page="index" class="navbar-inner" style="background-color:white">
<!-- We have home navbar without left link-->
<div class="center sliding"><strong>Phone App</strong></div>
<div class="right">
<!-- Right link contains only icon - additional "icon-only" class--><a href="#" class="link icon-only open-panel"> <i class="icon icon-bars"></i></a>
</div>
</div>
<!-- Navbar inner for About page-->
<div data-page="about" class="navbar-inner cached">
<div class="left sliding"><a href="#" class="back link"> <i class="icon icon-back"></i><span>Back</span></a></div>
<div class="center sliding"><strong>How it works</strong></div>
</div>
<!-- Navbar inner for Services page-->
<div data-page="services" class="navbar-inner cached">
<div class="left sliding"><a href="#" class="back link"> <i class="icon icon-back"></i><span>Back</span></a></div>
<div class="center sliding">Services</div>
</div>
<!-- Navbar inner for Form page-->
<div data-page="form" class="navbar-inner cached">
<div class="left sliding"><a href="#" class="back link"> <i class="icon icon-back"></i><span>Back</span></a></div>
<div class="center sliding"><strong>Submissions</strong></div>
</div>
</div>
<!-- Pages, because we need fixed-through navbar and toolbar, it has additional appropriate classes-->
<div class="pages navbar-through toolbar-through">
<!-- Index Page-->
<div data-page="index" class="page">
<!-- Scrollable page content-->
<div class="page-content" style="background-color: #ed1c24" >
<img src="images/Filler.png" alt="" class="ri">
<!--<h1 style="font-size: 3em;
color: ghostwhite;
text-shadow: red -2px -1px 1px;"> Flash <i class="fa fa-bolt" style="color: white; text-shadow: yellow -1px 2px 25px;"></i> News </h1>
<h2 style="color:ghostwhite;text-shadow: red -2px -1px 1px;">Please swipe to the right or use the above button to navigate the app!</h2>-->
</div>
</div>
<!-- About Page-->
<div data-page="about" class="page cached">
<div class="page-content" style="padding-top:0px; padding-bottom:0px">
<div class="content-block" style="padding:0; margin:0px">
<div class="content-block-title"></div>
<div class="one" style="background-image:url(images/8-People.jpg); background-size: cover; height:66vh">
<div class="card">
<div class="card-header">Filler</div>
<div class="card-content">
<div class="card-content-inner">
Filler
</div>
</div>
</div>
</div>
<div class="two" style="background-image:url(images/12370-NOAIKP.jpg); background-size: cover; height:66vh">
<div class="card">
<div class="card-header">Filler</div>
<div class="card-content">
<div class="card-content-inner">
Filler
</div>
</div>
</div>
</div>
<div class="three" style="background-image:url(images/10895-NN6QH9.jpg); background-size: cover; height:66vh">
<div class="card">
<div class="card-header">Filler</div>
<div class="card-content">
<div class="card-content-inner">
Filler
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<!-- Form Page-->
<div data-page="form" class="page cached">
<div class="page-content">
<iframe src="http://www.filler.com" style="width: 100%;height: 100%;border: 0;"></iframe>
</div>
</div>
</div>
<!-- Bottom Toolbar-->
</div>
</div>
<!-- Path to Framework7 Library JS-->
<script type="text/javascript" src="dist/js/framework7.min.js"></script>
<!-- Path to your app js-->
<script type="text/javascript" src="links/js/my-app.js"></script>
</body>
</html>