这篇文章给大家分享的是有关HTML+CSS3+JS如何实现下拉菜单的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
实现效果
html
<div class="container"> <h2 class="title">Dropdown Menu</h2> <ul> <li class="dropdown"> <a href="#" data-toggle="dropdown">First Menu <i class="icon-arrow"></i></a> <ul class="dropdown-menu"> <li><a href="#">Home</a></li> <li><a href="#">About Us</a></li> <li><a href="#">Services</a></li> <li><a href="#">Contact</a></li> </ul> </li> <li class="dropdown"> <a href="#" data-toggle="dropdown">Second Menu <i class="icon-arrow"></i></a> <ul class="dropdown-menu"> <li><a href="#">Home</a></li> <li><a href="#">About Us</a></li> <li><a href="#">Services</a></li> <li><a href="#">Contact</a></li> </ul> </li> <li class="dropdown"> <a href="#" data-toggle="dropdown">Third Menu <i class="icon-arrow"></i></a> <ul class="dropdown-menu"> <li><a href="#">Home</a></li> <li><a href="#">About Us</a></li> <li><a href="#">Services</a></li> <li><a href="#">Contact</a></li> </ul> </li> </ul> <p class="text-center"> See this same menu only with CSS3: <a href="https://codepen.io/pedronauck/pen/jaluz" target="_blank">https://codepen.io/pedronauck/pen/jaluz</a> </p> </div>
css
@import url("https://fonts.googleapis.com/css?family=Lato:300,400,700,900");
@import url(https://fonts.googleapis.com/css?family=Pacifico);
body {
font-family: "Lato", Helvetica, Arial;
font-size: 16px;
}
.text-center {
text-align: center;
}
*, *:before, *:after {
-webkit-border-sizing: border-box;
-moz-border-sizing: border-box;
border-sizing: border-box;
}
.container {
width: 350px;
margin: 50px auto;
}
.container > ul {
list-style: none;
padding: 0;
margin: 0 0 20px 0;
}
.title {
font-family: 'Pacifico';
font-weight: norma;
font-size: 40px;
text-align: center;
line-height: 1.4;
color: #2980B9;
}
.dropdown a {
text-decoration: none;
}
.dropdown [data-toggle="dropdown"] {
position: relative;
display: block;
color: white;
background: #2980B9;
-moz-box-shadow: 0 1px 0 #409ad5 inset, 0 -1px 0 #20638f inset;
-webkit-box-shadow: 0 1px 0 #409ad5 inset, 0 -1px 0 #20638f inset;
box-shadow: 0 1px 0 #409ad5 inset, 0 -1px 0 #20638f inset;
text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.3);
padding: 10px;
}
.dropdown [data-toggle="dropdown"]:hover {
background: #2c89c6;
}
.dropdown .icon-arrow {
position: absolute;
display: block;
font-size: 0.7em;
color: #fff;
top: 14px;
right: 10px;
}
.dropdown .icon-arrow.open {
-moz-transform: rotate(-180deg);
-ms-transform: rotate(-180deg);
-webkit-transform: rotate(-180deg);
transform: rotate(-180deg);
-moz-transition: -moz-transform 0.6s;
-o-transition: -o-transform 0.6s;
-webkit-transition: -webkit-transform 0.6s;
transition: transform 0.6s;
}
.dropdown .icon-arrow.close {
-moz-transform: rotate(0deg);
-ms-transform: rotate(0deg);
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
-moz-transition: -moz-transform 0.6s;
-o-transition: -o-transform 0.6s;
-webkit-transition: -webkit-transform 0.6s;
transition: transform 0.6s;
}
.dropdown .icon-arrow:before {
content: '\25BC';
}
.dropdown .dropdown-menu {
max-height: 0;
overflow: hidden;
list-style: none;
padding: 0;
margin: 0;
}
.dropdown .dropdown-menu li {
padding: 0;
}
.dropdown .dropdown-menu li a {
display: block;
color: #6f6f6f;
background: #EEE;
-moz-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d5d5d5 inset;
-webkit-box-shadow: 0 1px 0 white inset, 0 -1px 0 #d5d5d5 inset;
box-shadow: 0 1px 0 white inset, 0 -1px 0 #d5d5d5 inset;
text-shadow: 0 -1px 0 rgba(255, 255, 255, 0.3);
padding: 10px 10px;
}
.dropdown .dropdown-menu li a:hover {
background: #f6f6f6;
}
.dropdown .show, .dropdown .hide {
-moz-transform-origin: 50% 0%;
-ms-transform-origin: 50% 0%;
-webkit-transform-origin: 50% 0%;
transform-origin: 50% 0%;
}
.dropdown .show {
display: block;
max-height: 9999px;
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
animation: showAnimation 0.5s ease-in-out;
-moz-animation: showAnimation 0.5s ease-in-out;
-webkit-animation: showAnimation 0.5s ease-in-out;
-moz-transition: max-height 1s ease-in-out;
-o-transition: max-height 1s ease-in-out;
-webkit-transition: max-height 1s ease-in-out;
transition: max-height 1s ease-in-out;
}
.dropdown .hide {
max-height: 0;
-moz-transform: scaleY(0);
-ms-transform: scaleY(0);
-webkit-transform: scaleY(0);
transform: scaleY(0);
animation: hideAnimation 0.4s ease-out;
-moz-animation: hideAnimation 0.4s ease-out;
-webkit-animation: hideAnimation 0.4s ease-out;
-moz-transition: max-height 0.6s ease-out;
-o-transition: max-height 0.6s ease-out;
-webkit-transition: max-height 0.6s ease-out;
transition: max-height 0.6s ease-out;
}
@keyframes showAnimation {
0% {
-moz-transform: scaleY(0.1);
-ms-transform: scaleY(0.1);
-webkit-transform: scaleY(0.1);
transform: scaleY(0.1);
}
40% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
100% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
}
@-moz-keyframes showAnimation {
0% {
-moz-transform: scaleY(0.1);
-ms-transform: scaleY(0.1);
-webkit-transform: scaleY(0.1);
transform: scaleY(0.1);
}
40% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
100% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
}
@-webkit-keyframes showAnimation {
0% {
-moz-transform: scaleY(0.1);
-ms-transform: scaleY(0.1);
-webkit-transform: scaleY(0.1);
transform: scaleY(0.1);
}
40% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.04);
-ms-transform: scaleY(1.04);
-webkit-transform: scaleY(1.04);
transform: scaleY(1.04);
}
100% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
}
@keyframes hideAnimation {
0% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(0);
-ms-transform: scaleY(0);
-webkit-transform: scaleY(0);
transform: scaleY(0);
}
}
@-moz-keyframes hideAnimation {
0% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(0);
-ms-transform: scaleY(0);
-webkit-transform: scaleY(0);
transform: scaleY(0);
}
}
@-webkit-keyframes hideAnimation {
0% {
-moz-transform: scaleY(1);
-ms-transform: scaleY(1);
-webkit-transform: scaleY(1);
transform: scaleY(1);
}
60% {
-moz-transform: scaleY(0.98);
-ms-transform: scaleY(0.98);
-webkit-transform: scaleY(0.98);
transform: scaleY(0.98);
}
80% {
-moz-transform: scaleY(1.02);
-ms-transform: scaleY(1.02);
-webkit-transform: scaleY(1.02);
transform: scaleY(1.02);
}
100% {
-moz-transform: scaleY(0);
-ms-transform: scaleY(0);
-webkit-transform: scaleY(0);
transform: scaleY(0);
}
}js
// Dropdown Menu
var dropdown = document.querySelectorAll('.dropdown');
var dropdownArray = Array.prototype.slice.call(dropdown,0);
dropdownArray.forEach(function(el){
var button = el.querySelector('a[data-toggle="dropdown"]'),
menu = el.querySelector('.dropdown-menu'),
arrow = button.querySelector('i.icon-arrow');
button.onclick = function(event) {
if(!menu.hasClass('show')) {
menu.classList.add('show');
menu.classList.remove('hide');
arrow.classList.add('open');
arrow.classList.remove('close');
event.preventDefault();
}
else {
menu.classList.remove('show');
menu.classList.add('hide');
arrow.classList.remove('open');
arrow.classList.add('close');
event.preventDefault();
}
};
})
Element.prototype.hasClass = function(className) {
return this.className && new RegExp("(^|\\s)" + className + "(\\s|$)").test(this.className);
};感谢各位的阅读！关于“HTML+CSS3+JS如何实现下拉菜单”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧！
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