我唯一的问题是。我有css下拉菜单。在我悬停在它之前，我看到一个滚动条。当我进行调试时，我发现有隐藏的li元素。但当我将鼠标悬停在菜单上时，滚动条就消失了。似乎li元素正在变得风格化，并且它们变小并且在悬停后适合视口。问题出在菜单产品＆gt;菜单的这一部分上。产品1
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #menu-button {
margin: 0;
padding: 0;
border: 0;
list-style: none;
line-height: 1;
display: block;
position: relative;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
#cssmenu:after,
#cssmenu > ul:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
#cssmenu #menu-button {
display: none;
}
#cssmenu {
width: auto;
font-family: 'Open Sans', Helvetica, sans-serif;
background: #39b1cc;
background: -moz-linear-gradient(top, #51bbd2 0%, #2d97af 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #51bbd2), color-stop(100%, #2d97af));
background: -webkit-linear-gradient(top, #51bbd2 0%, #2d97af 100%);
background: -o-linear-gradient(top, #51bbd2 0%, #2d97af 100%);
background: -ms-linear-gradient(top, #51bbd2 0%, #2d97af 100%);
background: linear-gradient(to bottom, #51bbd2 0%, #2d97af 100%);
}
#cssmenu > ul {
background: url('images/bg.png');
box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.05);
}
#cssmenu.align-right > ul > li {
float: right;
}
#cssmenu > ul > li {
float: left;
display: inline-block;
}
#cssmenu.align-center > ul {
float: none;
text-align: center;
}
#cssmenu.align-center > ul > li {
float: none;
}
#cssmenu.align-center ul ul {
text-align: left;
}
#cssmenu > ul > li > a {
padding: 18px 25px 21px 25px;
border-right: 1px solid rgba(80, 80, 80, 0.12);
text-decoration: none;
font-size: 13px;
font-weight: 700;
color: #d3eced;
text-transform: uppercase;
letter-spacing: 1px;
}
#cssmenu > ul > li:hover > a,
#cssmenu > ul > li > a:hover,
#cssmenu > ul > li.active > a {
color: #ffffff;
background: #32a9c3;
background: rgba(0, 0, 0, 0.1);
}
#cssmenu > ul > li.has-sub > a {
padding-right: 45px;
}
#cssmenu > ul > li.has-sub > a::after {
content: "";
position: absolute;
width: 0;
height: 0;
border: 6px solid transparent;
border-top-color: #d3eced;
right: 17px;
top: 22px;
}
#cssmenu > ul > li.has-sub.active > a::after,
#cssmenu > ul > li.has-sub:hover > a {
border-top-color: #ffffff;
}
#cssmenu ul ul {
position: absolute;
left: -9999px;
top: 60px;
padding-top: 6px;
font-size: 13px;
opacity: 0;
-webkit-transition: top 0.2s ease, opacity 0.2s ease-in;
-moz-transition: top 0.2s ease, opacity 0.2s ease-in;
-ms-transition: top 0.2s ease, opacity 0.2s ease-in;
-o-transition: top 0.2s ease, opacity 0.2s ease-in;
transition: top 0.2s ease, opacity 0.2s ease-in;
}
#cssmenu.align-right ul ul {
text-align: right;
}
#cssmenu > ul > li > ul::after {
content: "";
position: absolute;
width: 0;
height: 0;
border: 5px solid transparent;
border-bottom-color: #ffffff;
top: -4px;
left: 20px;
}
#cssmenu.align-right > ul > li > ul::after {
left: auto;
right: 20px;
}
#cssmenu ul ul ul::after {
content: "";
position: absolute;
width: 0;
height: 0;
border: 5px solid transparent;
border-right-color: #ffffff;
top: 11px;
left: -4px;
}
#cssmenu.align-right ul ul ul::after {
border-right-color: transparent;
border-left-color: #ffffff;
left: auto;
right: -4px;
}
#cssmenu > ul > li > ul {
top: 120px;
}
#cssmenu > ul > li:hover > ul {
top: 52px;
left: 0;
opacity: 1;
}
#cssmenu.align-right > ul > li:hover > ul {
left: auto;
right: 0;
}
#cssmenu ul ul ul {
padding-top: 0;
padding-left: 6px;
}
#cssmenu.align-right ul ul ul {
padding-right: 6px;
}
#cssmenu ul ul > li:hover > ul {
left: 180px;
top: 0;
opacity: 1;
}
#cssmenu.align-right ul ul > li:hover > ul {
left: auto;
right: 100%;
opacity: 1;
}
#cssmenu ul ul li a {
text-decoration: none;
font-weight: 400;
padding: 11px 25px;
width: 180px;
color: #777777;
background: #ffffff;
box-shadow: 0 2px 2px rgba(0, 0, 0, 0.1), 1px 1px 1px rgba(0, 0, 0, 0.1), -1px 1px 1px rgba(0, 0, 0, 0.1);
}
#cssmenu ul ul li:hover > a,
#cssmenu ul ul li.active > a {
color: #333333;
}
#cssmenu ul ul li:first-child > a {
border-top-left-radius: 3px;
border-top-right-radius: 3px;
}
#cssmenu ul ul li:last-child > a {
border-bottom-left-radius: 3px;
border-bottom-right-radius: 3px;
}
#cssmenu > ul > li > ul::after {
position: absolute;
display: block;
}
#cssmenu ul ul li.has-sub > a::after {
content: "";
position: absolute;
width: 0;
height: 0;
border: 4px solid transparent;
border-left-color: #777777;
right: 17px;
top: 14px;
}
#cssmenu.align-right ul ul li.has-sub > a::after {
border-left-color: transparent;
border-right-color: #777777;
right: auto;
left: 17px;
}
#cssmenu ul ul li.has-sub.active > a::after,
#cssmenu ul ul li.has-sub:hover > a::after {
border-left-color: #333333;
}
#cssmenu.align-right ul ul li.has-sub.active > a::after,
#cssmenu.align-right ul ul li.has-sub:hover > a::after {
border-right-color: #333333;
border-left-color: transparent;
}<!doctype html>
<html lang=''>
<head>
<meta charset='utf-8'>
<link rel="stylesheet" href="styles.css">
<script src="script.js"></script>
<title>CSS MenuMaker</title>
</head>
<body>
<div id='cssmenu'>
<ul>
<li><a href='#'><span>Home</span></a></li>
<li class='active has-sub'><a href='#'><span>Products</span></a>
<ul>
<li class='has-sub'><a href='#'><span>Product 1</span></a>
<ul>
<li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li>
</ul>
</li>
<li class='has-sub'><a href='#'><span>Product 2</span></a>
<ul>
<li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li>
</ul>
</li>
</ul>
</li>
<li><a href='#'><span>About</span></a></li>
<li class='last'><a href='#'><span>Contact</span></a></li>
</ul>
</div>
</body>
<html>
我可以在悬停在菜单上之前停止加载li吗？或者我可以在悬停之前将其设置为超小型以及如何设置？
答案 0 :(得分：1)
您应该使用display:block;/display:none;代替opacity:1;/opacity:0;
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #menu-button {
margin: 0;
padding: 0;
border: 0;
list-style: none;
line-height: 1;
display: block;
position: relative;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
#cssmenu:after,
#cssmenu>ul:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
#cssmenu #menu-button {
display: none;
}
#cssmenu {
width: auto;
font-family: 'Open Sans', Helvetica, sans-serif;
background: #39b1cc;
background: -moz-linear-gradient(top, #51bbd2 0%, #2d97af 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #51bbd2), color-stop(100%, #2d97af));
background: -webkit-linear-gradient(top, #51bbd2 0%, #2d97af 100%);
background: -o-linear-gradient(top, #51bbd2 0%, #2d97af 100%);
background: -ms-linear-gradient(top, #51bbd2 0%, #2d97af 100%);
background: linear-gradient(to bottom, #51bbd2 0%, #2d97af 100%);
}
#cssmenu>ul {
background: url('images/bg.png');
box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.05);
}
#cssmenu.align-right>ul>li {
float: right;
}
#cssmenu>ul>li {
float: left;
display: inline-block;
}
#cssmenu.align-center>ul {
float: none;
text-align: center;
}
#cssmenu.align-center>ul>li {
float: none;
}
#cssmenu.align-center ul ul {
text-align: left;
}
#cssmenu>ul>li>a {
padding: 18px 25px 21px 25px;
border-right: 1px solid rgba(80, 80, 80, 0.12);
text-decoration: none;
font-size: 13px;
font-weight: 700;
color: #d3eced;
text-transform: uppercase;
letter-spacing: 1px;
}
#cssmenu>ul>li:hover>a,
#cssmenu>ul>li>a:hover,
#cssmenu>ul>li.active>a {
color: #ffffff;
background: #32a9c3;
background: rgba(0, 0, 0, 0.1);
}
#cssmenu>ul>li.has-sub>a {
padding-right: 45px;
}
#cssmenu>ul>li.has-sub>a::after {
content: "";
position: absolute;
width: 0;
height: 0;
border: 6px solid transparent;
border-top-color: #d3eced;
right: 17px;
top: 22px;
}
#cssmenu>ul>li.has-sub.active>a::after,
#cssmenu>ul>li.has-sub:hover>a {
border-top-color: #ffffff;
}
#cssmenu ul ul {
position: absolute;
left: -9999px;
top: 60px;
padding-top: 6px;
font-size: 13px;
/* opacity: 0; */
display: none;
-webkit-transition: top 0.2s ease, opacity 0.2s ease-in;
-moz-transition: top 0.2s ease, opacity 0.2s ease-in;
-ms-transition: top 0.2s ease, opacity 0.2s ease-in;
-o-transition: top 0.2s ease, opacity 0.2s ease-in;
transition: top 0.2s ease, opacity 0.2s ease-in;
}
#cssmenu.align-right ul ul {
text-align: right;
}
#cssmenu>ul>li>ul::after {
content: "";
position: absolute;
width: 0;
height: 0;
border: 5px solid transparent;
border-bottom-color: #ffffff;
top: -4px;
left: 20px;
}
#cssmenu.align-right>ul>li>ul::after {
left: auto;
right: 20px;
}
#cssmenu ul ul ul::after {
content: "";
position: absolute;
width: 0;
height: 0;
border: 5px solid transparent;
border-right-color: #ffffff;
top: 11px;
left: -4px;
}
#cssmenu.align-right ul ul ul::after {
border-right-color: transparent;
border-left-color: #ffffff;
left: auto;
right: -4px;
}
#cssmenu>ul>li>ul {
top: 120px;
}
#cssmenu>ul>li:hover>ul {
top: 52px;
left: 0;
/* opacity: 1; */
display: block;
}
#cssmenu.align-right>ul>li:hover>ul {
left: auto;
right: 0;
}
#cssmenu ul ul ul {
padding-top: 0;
padding-left: 6px;
}
#cssmenu.align-right ul ul ul {
padding-right: 6px;
}
#cssmenu ul ul>li:hover>ul {
left: 180px;
top: 0;
/* opacity: 1; */
display: block;
}
#cssmenu.align-right ul ul>li:hover>ul {
left: auto;
right: 100%;
/* opacity: 1; */
display: block;
}
#cssmenu ul ul li a {
text-decoration: none;
font-weight: 400;
padding: 11px 25px;
width: 180px;
color: #777777;
background: #ffffff;
box-shadow: 0 2px 2px rgba(0, 0, 0, 0.1), 1px 1px 1px rgba(0, 0, 0, 0.1), -1px 1px 1px rgba(0, 0, 0, 0.1);
}
#cssmenu ul ul li:hover>a,
#cssmenu ul ul li.active>a {
color: #333333;
}
#cssmenu ul ul li:first-child>a {
border-top-left-radius: 3px;
border-top-right-radius: 3px;
}
#cssmenu ul ul li:last-child>a {
border-bottom-left-radius: 3px;
border-bottom-right-radius: 3px;
}
#cssmenu>ul>li>ul::after {
position: absolute;
display: block;
}
#cssmenu ul ul li.has-sub>a::after {
content: "";
position: absolute;
width: 0;
height: 0;
border: 4px solid transparent;
border-left-color: #777777;
right: 17px;
top: 14px;
}
#cssmenu.align-right ul ul li.has-sub>a::after {
border-left-color: transparent;
border-right-color: #777777;
right: auto;
left: 17px;
}
#cssmenu ul ul li.has-sub.active>a::after,
#cssmenu ul ul li.has-sub:hover>a::after {
border-left-color: #333333;
}
#cssmenu.align-right ul ul li.has-sub.active>a::after,
#cssmenu.align-right ul ul li.has-sub:hover>a::after {
border-right-color: #333333;
border-left-color: transparent;
}<!doctype html>
<html lang=''>
<head>
<meta charset='utf-8'>
<link rel="stylesheet" href="styles.css">
<script src="script.js"></script>
<title>CSS MenuMaker</title>
</head>
<body>
<div id='cssmenu'>
<ul>
<li><a href='#'><span>Home</span></a></li>
<li class='active has-sub'><a href='#'><span>Products</span></a>
<ul>
<li class='has-sub'><a href='#'><span>Product 1</span></a>
<ul>
<li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li> <li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li>
</ul>
</li>
<li class='has-sub'><a href='#'><span>Product 2</span></a>
<ul>
<li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li>
</ul>
</li>
</ul>
</li>
<li><a href='#'><span>About</span></a></li>
<li class='last'><a href='#'><span>Contact</span></a></li>
</ul>
</div>
</body>
<html>
其他选项您可以在overflow中使用height和ul属性，其中包含许多选项。例如:-
overflow: auto;height: 100px;