我只是在测试 W3Schools 提供的响应式顶部导航示例，我对内部样式表做了一个小修改，因此文本 Home 将移动到菜单的中心并且它未对齐当我点击导航按钮时。
为什么会发生这种情况以及如何解决？
<!DOCTYPE html>
<html>
<head>
<style>
body {
margin: 0;
}
ul.topnav {
text-align: center;
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
ul.topnav li {
display: inline-block;
text-align: center;
}
ul.topnav li a {
display: inline-block;
color: #f2f2f2;
text-align: center;
text-decoration: none;
transition: 0.3s;
padding: 14px 16px;
font-size: 17px;
}
ul.topnav li a:hover {
background-color: #555;
}
ul.topnav li.icon {
display: none;
}
@media screen and (max-width: 680px) {
ul.topnav li:not(:first-child) {
display: none;
}
ul.topnav li.icon {
float: right;
display: inline-block;
}
}
@media screen and (max-width: 680px) {
ul.topnav.responsive {
position: relative;
}
ul.topnav.responsive li.icon {
position: absolute;
right: 0;
top: 0;
}
ul.topnav.responsive li {
float: none;
display: inline;
}
ul.topnav.responsive li a {
display: block;
text-align: center;
}
}
</style>
</head>
<body>
<ul class="topnav" id="myTopnav">
<li><a class="active" href="#home">Home</a>
</li>
<li><a href="#news">News</a>
</li>
<li><a href="#contact">Contact</a>
</li>
<li><a href="#about">About</a>
</li>
<li class="icon">
<a href="javascript:void(0);" style="font-size:15px;" onclick="myFunction()">☰</a>
</li>
</ul>
<div style="padding-left:16px">
<h2>Responsive Topnav Example</h2>
<p>Resize the browser window to see how it works.</p>
</div>
<script>
function myFunction() {
var x = document.getElementById("myTopnav");
if (x.className === "topnav") {
x.className += " responsive";
} else {
x.className = "topnav";
}
}
</script>
</body>
</html>最佳答案
正如我在评论中所说，问题是因为您的 li.icon 在 position: relative 和 position: absolute 之间切换
你必须将它固定到 position:absolute
<!DOCTYPE html>
<html>
<head>
<style>
body {
margin: 0;
}
ul.topnav {
text-align: center;
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
ul.topnav li {
display: inline-block;
text-align: center;
}
ul.topnav li a {
display: inline-block;
color: #f2f2f2;
text-align: center;
text-decoration: none;
transition: 0.3s;
padding: 14px 16px;
font-size: 17px;
}
ul.topnav li a:hover {
background-color: #555;
}
ul.topnav li.icon {
display: none;
}
@media screen and (max-width: 680px) {
ul.topnav li:not(:first-child) {
display: none;
}
ul.topnav li.icon {
display: inline-block;
position: absolute;
right: 0;
}
}
@media screen and (max-width: 680px) {
ul.topnav.responsive {
position: relative;
}
ul.topnav.responsive li.icon {
position: absolute;
right: 0;
top: 0;
}
ul.topnav.responsive li {
float: none;
display: inline;
}
ul.topnav.responsive li a {
display: block;
text-align: center;
}
}
</style>
</head>
<body>
<ul class="topnav" id="myTopnav">
<li><a class="active" href="#home">Home</a>
</li>
<li><a href="#news">News</a>
</li>
<li><a href="#contact">Contact</a>
</li>
<li><a href="#about">About</a>
</li>
<li class="icon">
<a href="javascript:void(0);" style="font-size:15px;" onclick="myFunction()">☰</a>
</li>
</ul>
<div style="padding-left:16px">
<h2>Responsive Topnav Example</h2>
<p>Resize the browser window to see how it works.</p>
</div>
<script>
function myFunction() {
var x = document.getElementById("myTopnav");
if (x.className === "topnav") {
x.className += " responsive";
} else {
x.className = "topnav";
}
}
</script>
</body>
</html>关于javascript - 单击响应式导航按钮时文本未对齐，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40017490/