这是我的问题：
如果您调整以下页面的大小（使其缩小），则Home和Dropdown按钮的大小不同。
此外，＆＃39;汉堡菜单＆＃39;出现在右侧，单击时会变为不同的大小。
搜索栏不会填充100％的宽度。
如何解决这些问题？
我将为我的网站重复使用的标签菜单的这一部分。
/* When the user clicks on the button, toggle between hiding and showing the dropdown content */
function mySecondFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
function filterFunction() {
var input, filter, ul, li, a, i;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
div = document.getElementById("myDropdown");
a = div.getElementsByTagName("a");
for (i = 0; i < a.length; i++) {
if (a[i].innerHTML.toUpperCase().indexOf(filter) > -1) {
a[i].style.display = "";
} else {
a[i].style.display = "none";
}
}
}
function myFunction() {
var x = document.getElementById("myTopnav");
if (x.className === "topnav") {
x.className += " responsive";
} else {
x.className = "topnav";
}
}body {
margin: 0;
font-family: Arial
}
/* Add a black background color to the top navigation */
.topnav {
background-color: #333;
overflow: hidden;
}
/* Style the links inside the navigation bar */
.topnav a {
float: left;
display: block;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
}
/* Add an active class to highlight the current page */
.active {
background-color: #4CAF50;
color: white;
}
/* Hide the link that should open and close the topnav on small screens */
.topnav .icon {
display: none;
}
/* Dropdown Button */
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
/* Dropdown button on hover & focus */
.dropbtn:hover,
.dropbtn:focus {
background-color: #3e8e41;
}
/* The search field */
#myInput {
border-box: box-sizing;
background-image: url('searchicon.png');
background-position: 14px 12px;
background-repeat: no-repeat;
font-size: 16px;
padding: 14px 20px 12px 45px;
border: none;
border-bottom: 1px solid #ddd;
}
/* The search field when it gets focus/clicked on */
#myInput:focus {
outline: 3px solid #ddd;
}
/* Dropdown container - needed to position the dropdown content */
.dropdown {
float: left;
overflow: hidden;
}
/* Style the dropdown button to fit inside the topnav */
.dropdown .dropbtn {
font-size: 17px;
border: none;
outline: none;
color: white;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
}
/* Style the dropdown content (hidden by default) */
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
z-index: 1;
}
/* Style the links inside the dropdown */
.dropdown-content a {
float: none;
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
/* Add a dark background on topnav links and the dropdown button on hover */
.topnav a:hover,
.dropdown:hover .dropbtn {
background-color: #555;
color: white;
}
/* Add a grey background to dropdown links on hover */
.dropdown-content a:hover {
background-color: #ddd;
color: black;
}
/* Show the dropdown menu when the user moves the mouse over the dropdown button */
.dropdown:hover .dropdown-content {
display: block;
}
/* Show the dropdown menu when the user moves the mouse over the dropdown button */
.dropdown:hover .dropdown-content {
display: block;
}
/* When the screen is less than 600 pixels wide, hide all links, except for the first one ("Home"). Show the link that contains should open and close the topnav (.icon) */
@media screen and (max-width: 600px) {
.topnav a:not(:first-child) {
display: none;
}
.topnav a.icon {
float: right;
display: block;
}
}
/* The "responsive" class is added to the topnav with JavaScript when the user clicks on the icon. This class makes the topnav look good on small screens (display the links vertically instead of horizontally) */
@media screen and (max-width: 600px) {
.topnav.responsive {
position: relative;
}
.topnav.responsive a.icon {
position: absolute;
right: 0;
top: 0;
}
.topnav.responsive a {
float: none;
display: block;
text-align: left;
}
.topnav.responsive .dropdown {
float: none;
}
.topnav.responsive .dropdown-content {
position: relative;
}
.topnav.responsive .dropdown .dropbtn {
display: block;
width: 100%;
text-align: left;
}
}<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="topnav" id="myTopnav">
<a href="#home" class="active">Home</a>
<a href="#news">News</a>
<a href="#contact">Contact</a>
<a href="#about">About</a>
<a href="javascript:void(0);" class="icon" onclick="myFunction()">☰</a>
<div class="dropdown">
<button onclick="mySecondFunction()" class="dropbtn">Dropdown</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
<a href="#about">About</a>
<a href="#base">Base</a>
<a href="#blog">Blog</a>
<a href="#contact">Contact</a>
<a href="#custom">Custom</a>
<a href="#support">Support</a>
<a href="#tools">Tools</a>
</div>
</div>
</div>
答案 0 :(得分：0)
您的代码存在一些小问题。
首先，按钮大小的差异是因为您没有指定元素的行高。将行高定义为1后，所有大小问题都会得到解决。
.topnav a,
.dropdown .dropbtn {
line-height: 1;
}
对于搜索宽度，您只需要给出宽度：100％;到你的搜索框。
#myInput {
width: 100%;
}
/* When the user clicks on the button, toggle between hiding and showing the dropdown content */
function mySecondFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
function filterFunction() {
var input, filter, ul, li, a, i;
input = document.getElementById("myInput");
filter = input.value.toUpperCase();
div = document.getElementById("myDropdown");
a = div.getElementsByTagName("a");
for (i = 0; i < a.length; i++) {
if (a[i].innerHTML.toUpperCase().indexOf(filter) > -1) {
a[i].style.display = "";
} else {
a[i].style.display = "none";
}
}
}
function myFunction() {
var x = document.getElementById("myTopnav");
if (x.className === "topnav") {
x.className += " responsive";
} else {
x.className = "topnav";
}
}body {
margin: 0;
font-family: Arial
}
/* Add a black background color to the top navigation */
.topnav {
background-color: #333;
overflow: hidden;
}
/* Style the links inside the navigation bar */
.topnav a {
float: left;
display: block;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
line-height: 1;
}
/* Add an active class to highlight the current page */
.active {
background-color: #4CAF50;
color: white;
}
/* Hide the link that should open and close the topnav on small screens */
.topnav .icon {
display: none;
}
/* Dropdown Button */
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
/* Dropdown button on hover & focus */
.dropbtn:hover,
.dropbtn:focus {
background-color: #3e8e41;
}
/* The search field */
#myInput {
border-box: box-sizing;
background-image: url('searchicon.png');
background-position: 14px 12px;
background-repeat: no-repeat;
font-size: 16px;
padding: 14px 20px 12px 45px;
border: none;
border-bottom: 1px solid #ddd;
}
/* The search field when it gets focus/clicked on */
#myInput:focus {
outline: 3px solid #ddd;
}
/* Dropdown container - needed to position the dropdown content */
.dropdown {
float: left;
overflow: hidden;
}
/* Style the dropdown button to fit inside the topnav */
.dropdown .dropbtn {
font-size: 17px;
border: none;
outline: none;
color: white;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
line-height: 1;
}
/* Style the dropdown content (hidden by default) */
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
z-index: 1;
}
/* Style the links inside the dropdown */
.dropdown-content a {
float: none;
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
/* Add a dark background on topnav links and the dropdown button on hover */
.topnav a:hover,
.dropdown:hover .dropbtn {
background-color: #555;
color: white;
}
/* Add a grey background to dropdown links on hover */
.dropdown-content a:hover {
background-color: #ddd;
color: black;
}
/* Show the dropdown menu when the user moves the mouse over the dropdown button */
.dropdown:hover .dropdown-content {
display: block;
}
/* Show the dropdown menu when the user moves the mouse over the dropdown button */
.dropdown:hover .dropdown-content {
display: block;
}
/* When the screen is less than 600 pixels wide, hide all links, except for the first one ("Home"). Show the link that contains should open and close the topnav (.icon) */
@media screen and (max-width: 600px) {
.topnav a:not(:first-child) {
display: none;
}
.topnav a.icon {
float: right;
display: block;
}
}
/* The "responsive" class is added to the topnav with JavaScript when the user clicks on the icon. This class makes the topnav look good on small screens (display the links vertically instead of horizontally) */
@media screen and (max-width: 600px) {
#myInput {
width: 100%;
}
.topnav.responsive {
position: relative;
}
.topnav.responsive a.icon {
position: absolute;
right: 0;
top: 0;
}
.topnav.responsive a {
float: none;
display: block;
text-align: left;
}
.topnav.responsive .dropdown {
float: none;
}
.topnav.responsive .dropdown-content {
position: relative;
}
.topnav.responsive .dropdown .dropbtn {
display: block;
width: 100%;
text-align: left;
}
}<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="topnav" id="myTopnav">
<a href="#home" class="active">Home</a>
<a href="#news">News</a>
<a href="#contact">Contact</a>
<a href="#about">About</a>
<a href="javascript:void(0);" class="icon" onclick="myFunction()">☰</a>
<div class="dropdown">
<button onclick="mySecondFunction()" class="dropbtn">Dropdown</button>
<div id="myDropdown" class="dropdown-content">
<input type="text" placeholder="Search.." id="myInput" onkeyup="filterFunction()">
<a href="#about">About</a>
<a href="#base">Base</a>
<a href="#blog">Blog</a>
<a href="#contact">Contact</a>
<a href="#custom">Custom</a>
<a href="#support">Support</a>
<a href="#tools">Tools</a>
</div>
</div>
</div>