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js点击出现二级下拉菜单

2018-01-25 14:12 148 查看 
<!DOCTYPE html>
<html>
<head>
<title>Dropdown</title>
<link rel="stylesheet" href="style.css">
<meta charset="utf-8" />
<style type="text/css">
body {
font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
}
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: #1f75cf;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #fafafa;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
color: white;
background-color: #1f75cf;
}
.show {
display: block;
}
</style>
</head>
<body>
<ul>
<li class="dropdown">
<a id="a" href="javascript:void(0)" class="dropbtn" onclick="showList(this)">标题 A</a>
<div class="dropdown-content" id="dropdown-a">
<a href="#">下拉 1</a>
<a href="#">下拉 2</a>
<a href="#">下拉 3</a>
</div>
</li>
<li class="dropdown">
<a id="b" href="javascript:void(0)" class="dropbtn" onclick="showList(this)">标题 B</a>
<div class="dropdown-content" id="dropdown-b">
<a href="#">下拉 1</a>
<a href="#">下拉 2</a>
<a href="#">下拉 3</a>
</div>
</li>
</ul>
<script type="text/javascript">
function showList(o) {
hideList("dropdown-content" + o.id);
document.getElementById("dropdown-" + o.id).classList.toggle("show");
}

function hideList(option) {
var dropdowns = document.getElementsByClassName("dropdown-content");

for (var i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.id != option) {
if (openDropdown.classList.contains('show')) {
openDropdown.classList.remove('show');
}
}
}
}

window.onclick = function(e) {
if (!e.target.matches('.dropbtn')) {
hideList("");
}
}
</script>
</body>
</html>

                                            

                                        

                        
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