无法在Chrome浏览器中查看我的下拉菜单，但当我在这里插入代码时，我可以查看.如何来

Cannot view my drop down menu in Chrome browser, but when I insert the codes in here, I can view that. How come?

本文关键字：代码 插入 在这里 我可以 浏览器 Chrome 看我 下拉菜单 我的      更新时间：2023-09-26

我有下面的代码，但是，当我用visual studio代码修改代码并在我的Chrome浏览器中运行它时，我无法看到"热门产品"部分的下拉菜单。

然而，当我插入代码在这里(stackoverflow)，我可以看到我的下拉菜单。有人能给我解释一下这是怎么发生的吗?如何解决这个问题，让我可以在所有浏览器中查看?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SO的下拉菜单。只要从#navigation_bar中移除overflow: hidden，它应该就可以工作了:

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>
</html>

从#navigation_bar id中删除overflow: hidden;将帮助您看到下拉菜单。

小提琴

这与浏览器无关。因为

，当屏幕足够宽，可以在一行中显示菜单时，它就完全不可见了
#navigation_bar {
    overflow: hidden;
}

即使在您的示例中，它也不会显示所有菜单项，只显示那些适合导航栏高度的菜单项。因此，只要删除这个属性，以便显示覆盖的菜单项，无论菜单的高度如何

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