我按照此处的示例代码 将可关闭的抽屉放在顶部应用程序栏下，但它不起作用。
这是我尝试过的：
// Note: these styles do not account for any paddings/margins that you may need.
body {
display: flex;
height: 100vh;
}
.mdc-drawer-app-content {
flex: auto;
overflow: auto;
position: relative;
}
.main-content {
overflow: auto;
height: 100%;
}
.app-bar {
position: absolute;
}
// only apply this style if below top app bar
.mdc-top-app-bar {
z-index: 7;
}<!doctype html>
<html lang="en-US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Default Page Title</title>
<link rel="stylesheet" type="text/css" href="drawer.css">
<!--[if lt IE 9]>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Test</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.1/normalize.min.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:400,500,700,900&display=swap">
<link rel="stylesheet" href="https://unpkg.com/material-components-web@4.0.0/dist/material-components-web.min.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
<link rel="stylesheet" href="./drawer.css">
</head>
<header class="mdc-top-app-bar app-bar" id="app-bar">
<div class="mdc-top-app-bar__row">
<section class="mdc-top-app-bar__section mdc-top-app-bar__section--align-start">
<button class="mdc-top-app-bar__navigation-icon mdc-icon-button material-icons" href="#">menu</button>
<span class="mdc-top-app-bar__title">Dismissible Drawer</span>
</section>
</div>
</header>
<aside class="mdc-drawer mdc-drawer--dismissible mdc-top-app-bar--fixed-adjust">
<div class="mdc-drawer__content">
<div class="mdc-list">
<a class="mdc-list-item mdc-list-item--activated" href="#" aria-current="page">
<i class="material-icons mdc-list-item__graphic" aria-hidden="true">inbox</i>
<span class="mdc-list-item__text">Inbox</span>
</a>
<a class="mdc-list-item" href="#">
<i class="material-icons mdc-list-item__graphic" aria-hidden="true">send</i>
<span class="mdc-list-item__text">Outgoing</span>
</a>
<a class="mdc-list-item" href="#">
<i class="material-icons mdc-list-item__graphic" aria-hidden="true">drafts</i>
<span class="mdc-list-item__text">Drafts</span>
</a>
</div>
</div>
</aside>
<div class="mdc-drawer-app-content mdc-top-app-bar--fixed-adjust">
<main class="main-content" id="main-content">
App Content
</main>
</div>
<body>
<script src="https://unpkg.com/material-components-web@4.0.0/dist/material-components-web.min.js"></script>
<script>
// Instantiate MDC Drawer
const drawerEl = document.querySelector('.mdc-drawer');
const drawer = new mdc.drawer.MDCDrawer.attachTo(drawerEl);
// Instantiate MDC Top App Bar (required)
const topAppBarEl = document.querySelector('.mdc-top-app-bar');
const topAppBar = new mdc.topAppBar.MDCTopAppBar.attachTo(topAppBarEl);
topAppBar.setScrollTarget(document.querySelector('.main-content'));
topAppBar.listen('MDCTopAppBar:nav', () => {
drawer.open = !drawer.open;
});
</script>
</body>
</html>