菜单图标在单击时打开侧面导航，并且该图标变为“ X”。第二次单击时，我希望它关闭侧面导航并返回到正常菜单图标。
我有下面的代码：
<!DOCTYPE html>
<html>
<head>
<style>
.sidenav {
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: #111;
overflow-x: hidden;
transition: 0.5s;
padding-top: 60px;
}
.sidenav a {
padding: 8px 8px 8px 32px;
text-decoration: none;
font-size: 25px;
color: #818181;
display: block;
transition: 0.3s;
}
.sidenav a:hover {
color: #f1f1f1;
}
.sidenav .closebtn {
position: absolute;
top: 0;
right: 25px;
font-size: 36px;
margin-left: 50px;
}
#main {
transition: margin-left .5s;
padding: 16px;
}
@media screen and (max-height: 450px) {
.sidenav {padding-top: 15px;}
.sidenav a {font-size: 18px;}
}
.container {
display: inline-block;
cursor: pointer;
}
.bar1, .bar2, .bar3 {
width: 35px;
height: 5px;
background-color: #333;
margin: 6px 0;
transition: 0.4s;
}
.change .bar1 {
-webkit-transform: rotate(-45deg) translate(-9px, 6px) ;
transform: rotate(-45deg) translate(-9px, 6px) ;
}
.change .bar2 {opacity: 0;}
.change .bar3 {
-webkit-transform: rotate(45deg) translate(-8px, -8px) ;
transform: rotate(45deg) translate(-8px, -8px) ;
}
</style>
</head>
<body>
<div id="mySidenav" class="sidenav">
<a href="#">About</a>
<a href="#">Services</a>
<a href="#">Clients</a>
<a href="#">Contact</a>
</div>
<div id="main">
<div class="container" style="font-size:30px;cursor:pointer" onclick="openNav(); myFunction(this)">
<div class="bar1"></div>
<div class="bar2"></div>
<div class="bar3"></div>
</div>
</div>
<script>
function openNav() {
document.getElementById("mySidenav").style.width = "250px";
document.getElementById("main").style.marginLeft = "250px";
}
function closeNav() {
document.getElementById("mySidenav").style.width = "0";
document.getElementById("main").style.marginLeft= "0";
}
function myFunction(x) {
x.classList.toggle("change");
}
</script>
</body>
</html>
当前它可以打开侧面导航，但是我不确定如何告诉它在第二次单击时关闭侧面导航，或者将closeNav（）函数放在哪里。
任何帮助，将不胜感激。
最佳答案
我不喜欢添加尚未使用的JQuery ...您可以通过检查菜单的状态来做到这一点。
<div id="mySidenav" class="sidenav">
<a href="#">About</a>
<a href="#">Services</a>
<a href="#">Clients</a>
<a href="#">Contact</a>
</div>
<div id="main">
<div class="container" style="font-size:30px;cursor:pointer" onclick="toggleMenu(this)">
<div class="bar1"></div>
<div class="bar2"></div>
<div class="bar3"></div>
</div>
</div>
<script>
function openNav() {
document.getElementById("mySidenav").style.width = "250px";
document.getElementById("main").style.marginLeft = "250px";
}
function closeNav() {
document.getElementById("mySidenav").style.width = "0";
document.getElementById("main").style.marginLeft= "0";
}
function toggleMenu(x) {
x.classList.toggle("change");
if(document.getElementById("mySidenav").style.width > "1px"){
closeNav();
} else {
openNav();
}
}
</script>