一直在尝试启动页面时，会发生这样的错误：
未捕获的类型错误：$(...).sidenav 不是函数
在 HTMLDocument。(index.html:59)
在 j (jquery-3.2.1.min.js:2)
在 k (jquery-3.2.1.min.js:2)
为什么会出现？我好像一切都做对了？
索引.html：
<!DOCTYPE html>
<html>
<head>
<!--Import Google Icon Font-->
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<!--Import materialize.css-->
<link type="text/css" rel="stylesheet" href="css/materialize.min.css" media="screen,projection" />
<!--Let browser know website is optimized for mobile-->
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style>
header,
main,
footer {
padding-left: 300px;
}
@media only screen and (max-width : 992px) {
header,
main,
footer {
padding-left: 0;
}
}
</style>
</head>
<body>
<nav>
<a href="#" data-target="slide-out" class="sidenav-trigger"><i class="material-icons">menu</i></a>
</nav>
<ul id="slide-out" class="sidenav">
<li>
<div class="user-view">
<div class="background">
<img src="images/office.jpg">
</div>
<a href="#user"><img class="circle" src="images/yuna.jpg"></a>
<a href="#name"><span class="white-text name">John Doe</span></a>
<a href="#email"><span class="white-text email">jdandturk@gmail.com</span></a>
</div>
</li>
<li><a href="#!"><i class="material-icons">cloud</i>First Link With Icon</a></li>
<li><a href="#!">Second Link</a></li>
<li>
<div class="divider"></div>
</li>
<li><a class="subheader">Subheader</a></li>
<li><a class="waves-effect" href="#!">Third Link With Waves</a></li>
</ul>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script type="text/javascript" src="js/materialize.min.js"></script>
慕斯709654
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