如何在链接点击时关闭汉堡菜单

Question

我想在点击链接后关闭我的汉堡菜单，不知道该怎么做。我有一个水平汉堡导航菜单，我需要找到一种方法，一旦点击导航内的链接就关闭它。

我的代码：

这个Javascript用于在点击时打开和关闭菜单，但当我点击打开的汉堡菜单中的一个项目时，没有任何东西可以关闭菜单。

function myFunction() {
var x = document.getElementById("myTopnav");
if (x.className === "topnav") {
x.className += " responsive";
} else {
x.className = "topnav";
}
}

/* Makes Hamburger Heading Visible On Mobile Only */
.topnav .icon, #myTopnav, .active {
visibility: visible;
z-index: 10000;
}
/* Width Of Hamburger Navigation */
.topnav {
width: 100%;
}
/* Removes Desktop Heading & Navigation */
.nav, .top-heading {
display: none;
}
/* Header Color */
#fn {
color: #ffffff;
font-size: 32px;
}
/* Background And Overflow Of Hamburger Navigation */
.topnav {
background: linear-gradient(to top, #ff6699 0%, #ff9999 100%);
overflow: hidden;
}
/* Link Style Inside Hamburger Navigation */
.topnav a {
float: left;
display: block;
color: #ffffff;
text-align: center;
padding: 26px 16px;
text-decoration: none;
font-family: 'Alegreya Sans SC', sans-serif;
font-size: 28px;
}
/* Link Properties On Hover */
.topnav a:hover {
background-color: #ffffff;
color: black;
}
/* Active Highlight Of Current Page */
.active {
background: linear-gradient(to top, #ff6699 0%, #ff9999 100%);
color: #ffffff;
}
/* Closed Hamburger Properties */
.topnav a:not(:first-child) {display: none;}
.topnav a.icon {
float: right;
display: block;
}
/* Open Hamburger Properties */
.topnav.responsive {position: relative;}
.topnav.responsive a.icon {
position: absolute;
right: 0%;
top: 0;
}
/* Open Link Properties */
.topnav.responsive a {
float: none;
display: block;
text-align: left;
}
}

<!-- Hamburger Menu (for mobile) -->
<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" style="position:absolute;top:0px;">
<a href="index.html" class="active" class="nav-item" id="fn">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="javascript:void(0);" class="icon" onclick="myFunction()">
<i class="fa fa-bars"></i>
</a>
</div>

Answer 1

编辑：如果我正确理解你的问题，你想这样做，每当你点击汉堡图标时，你就会添加响应类，就会显示菜单，当你点击一些链接-a-标签时，关闭菜单。所以这是我编辑过的代码，经过测试，它应该对你有用：

HTML部分：

<!-- Hamburger Menu (for mobile) -->
<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" style="position:absolute;top:0px;">
<a href="index.html" class="active" class="nav-item" id="fn">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="#" class="nav-item">#</a>
<a href="javascript:void(0);" class="icon" onclick="myFunction()">
<i class="fa fa-bars"></i>
</a>
</div>

JS部分：

const x = document.getElementById("myTopnav");
function myFunction() {
// Toggle between adding / removing the responsive class from the menu
x.classList.toggle("responsive");
}
// We get all the a elements with class "nav-item", and attach a click
// listener to them which removes the responsive class from myTopNav element.
const theLinks = document.querySelectorAll(".nav-item");
theLinks.forEach(link => link.addEventListener("click", ()=>{
x.classList.remove("responsive");
}))

经过测试，它成功了，所以只需复制粘贴即可，但要试着了解发生了什么：(