是否有办法使png图像显示下拉菜单?

我试图通过点击png来制作下拉菜单。我设法使它与文本一起工作，但当我尝试用img src="menubutton.png"代替它时，如图所示，图像似乎是可点击的，但菜单不会出现。我是新手，我错过什么了吗?又或者它根本就不是这样的?

function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
window.onclick = function(event) {
if (!event.target.matches('.dropbtn')) {
var dropdowns = document.getElementsByClassName("dropdown-content");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show')) {
openDropdown.classList.remove('show');
}
}
}
}

.dropbtn {
background-color: rgba(240, 159, 240, 0);
color: rgb(255, 255, 255);
padding: 16px;
font-size: 16px;
border: none;
}
.dropbtn:hover,
.dropbtn:focus {
background-color: #e98ebb3d;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: relative;
background-color: #f1f1f13b;
min-width: 50px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.37);
z-index: 1;
}
.dropdown-content a {
color: rgba(0, 0, 0, 0.63);
padding: 50px 50px;
text-decoration: none;
display: block;
}
.dropdown a:hover {
background-color: rgba(221, 221, 221, 0.568);
}
.show {
display: block;
}

<div class="dropdown">
<button onclick="myFunction()" class="dropbtn"><img src="../photos/menubutton.png"></button>
<div id="myDropdown" class="dropdown-content">
<a href="#home"><img src="../photos/music-notes.png"></a>
<a href="#about">about</a>
<a href="#contact">about</a>
</div>
</div>

是。它在点击时打开，但由于窗口的原因立即关闭。Onclick事件处理程序。所以只有onclick="myFunction(); return false"会抵消它的传播

function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
window.onclick = function(event) {
if (!event.target.matches('.dropbtn')) {
var dropdowns = document.getElementsByClassName("dropdown-content");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show')) {
openDropdown.classList.remove('show');
}
}
}
}

<!DOCTYPE html>
<html lang="en">
<head>
<style>
.dropbtn {
background-color: rgba(240, 159, 240, 0);
color: rgb(255, 255, 255);
padding: 16px;
font-size: 16px;
border: none;
}

.dropbtn:hover,
.dropbtn:focus {
background-color: #e98ebb3d;
}

.dropdown {
position: relative;
display: inline-block;
}

.dropdown-content {
display: none;
position: relative;
background-color: #f1f1f13b;
min-width: 50px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.37);
z-index: 1;
}

.dropdown-content a {
color: rgba(0, 0, 0, 0.63);
padding: 50px 50px;
text-decoration: none;
display: block;
}

.dropdown a:hover {
background-color: rgba(221, 221, 221, 0.568);
}

.show {
display: block;
}
</style>
</head>
<body>
<div class="dropdown">
<button onclick="myFunction(); return false" class="dropbtn"><img src="../photos/menubutton.png"></button>
<div id="myDropdown" class="dropdown-content">
<a href="#home"><img src="../photos/music-notes.png"></a>
<a href="#about">about</a>
<a href="#contact">about</a>
</div>
</div>

在你的例子中,您指定event.target.matches('.dropbtn')但当你点击图片,没有类.dropbtn,所以它不运行事件。

如果你像这样改变你的按钮，它会工作。

<button onclick="myFunction()"><img src="../photos/menubutton.png" class="dropbtn"></button>

function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
window.onclick = function(event) {
if (!event.target.matches('.dropbtn')) {
var dropdowns = document.getElementsByClassName("dropdown-content");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show')) {
openDropdown.classList.remove('show');
}
}
}
}

.dropbtn {
background-color: rgba(240, 159, 240, 0);
color: rgb(255, 255, 255);
padding: 16px;
font-size: 16px;
border: none;
}
.dropbtn:hover,
.dropbtn:focus {
background-color: #e98ebb3d;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: relative;
background-color: #f1f1f13b;
min-width: 50px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.37);
z-index: 1;
}
.dropdown-content a {
color: rgba(0, 0, 0, 0.63);
padding: 50px 50px;
text-decoration: none;
display: block;
}
.dropdown a:hover {
background-color: rgba(221, 221, 221, 0.568);
}
.show {
display: block;
}

<body>
<div class="dropdown">
<button onclick="myFunction()"><img src="../photos/menubutton.png" class="dropbtn"></button>
<div id="myDropdown" class="dropdown-content">
<a href="#home"><img src="../photos/music-notes.png"></a>
<a href="#about">about</a>
<a href="#contact">about</a>
</div>
</div>
</body>

还有其他方法来编写代码，但这应该会让你上手!

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