我下面有代码，但是，当我使用Visual Studio代码修改代码并在Chrome浏览器中运行它时，我看不到“热门产品”中的下拉菜单。部分。
但是，当我在此处插入代码（stackoverflow）时，可以看到下拉菜单。有人可以向我解释这是怎么发生的吗？以及如何解决此问题，以便可以在所有类型的浏览器中查看？非常感谢！
body {
background-color: white;
background-repeat: no-repeat;
background-attachment: fixed;
background-size: cover;
}
/* Navigation bar */
#navigation_bar {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
position: fixed;
top: 0;
width: 100%;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover:not(.active), .dropdown:hover .dropbtn {
background-color: #111;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #4CAF50;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
background-color: #f1f1f1
}
.dropdown:hover .dropdown-content {
display: block;
}
.active {
background-color: #4CAF50;
}<!DOCTYPE html>
<html>
<head>
<title>Bo Kei Restaurant</title>
<link rel='stylesheet' type='text/css' href='stylesheet.css'/>
<script type='text/javascript' src='javascript/jquery-3.1.0.js'></script>
<script type='text/javascript' src='javascript/jquery-ui.min.js'></script>
<script type='text/javascript' src='javascript/script.js'></script>
</head>
<body>
<!--Navigation bar-->
<ul id="navigation_bar">
<li><a class="active" href="navigation_bar/home.html">Home.</a></li>
<li><a href="navigation_bar/promotion.html">Promotion.</a></li>
<!--drop down menu-->
<li class="dropdown"><a href="navigation_bar/hot_products.html" class="dropbtn">Hot Products.</a>
<div class="dropdown-content">
<a herf="navigation_bar/sub_menu/sandwiches.html">Sandwiches</a>
<a herf="navigation_bar/sub_menu/burger.html">Burger</a>
<a herf="navigation_bar/sub_menu/rice.html">Rice</a>
<a herf="navigation_bar/sub_menu/noodles.html">Noddles</a>
</div>
</li>
<!--Back to normal-->
<li><a href="navigation_bar/cold_products.html">Cold Products.</a></li>
<li><a href="navigation_bar/snacks.html">Snacks.</a></li>
<li><a href="navigation_bar/about_us.html">About Us.</a></li>
<li><a href="navigation_bar/contact_us.html">Contact Us.</a></li>
</ul>
</body>
</html>我看不到这里的下拉列表...overflow: hidden从中删除#navigation_bar，它应该可以正常工作：
body {
background-color: white;
background-repeat: no-repeat;
background-attachment: fixed;
background-size: cover;
}
/* Navigation bar */
#navigation_bar {
list-style-type: none;
margin: 0;
padding: 0;
background-color: #333;
position: fixed;
top: 0;
width: 100%;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover:not(.active), .dropdown:hover .dropbtn {
background-color: #111;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #4CAF50;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
background-color: #f1f1f1
}
.dropdown:hover .dropdown-content {
display: block;
}
.active {
background-color: #4CAF50;
}<!DOCTYPE html>
<html>
<head>
<title>Bo Kei Restaurant</title>
<link rel='stylesheet' type='text/css' href='stylesheet.css'/>
<script type='text/javascript' src='javascript/jquery-3.1.0.js'></script>
<script type='text/javascript' src='javascript/jquery-ui.min.js'></script>
<script type='text/javascript' src='javascript/script.js'></script>
</head>
<body>
<!--Navigation bar-->
<ul id="navigation_bar">
<li><a class="active" href="navigation_bar/home.html">Home.</a></li>
<li><a href="navigation_bar/promotion.html">Promotion.</a></li>
<!--drop down menu-->
<li class="dropdown"><a href="navigation_bar/hot_products.html" class="dropbtn">Hot Products.</a>
<div class="dropdown-content">
<a herf="navigation_bar/sub_menu/sandwiches.html">Sandwiches</a>
<a herf="navigation_bar/sub_menu/burger.html">Burger</a>
<a herf="navigation_bar/sub_menu/rice.html">Rice</a>
<a herf="navigation_bar/sub_menu/noodles.html">Noddles</a>
</div>
</li>
<!--Back to normal-->
<li><a href="navigation_bar/cold_products.html">Cold Products.</a></li>
<li><a href="navigation_bar/snacks.html">Snacks.</a></li>
<li><a href="navigation_bar/about_us.html">About Us.</a></li>
<li><a href="navigation_bar/contact_us.html">Contact Us.</a></li>
</ul>
</body>
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