<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>二级菜单</title>
<style>
* {
margin: 0;
padding: 0;
}
#myMenu {
margin: 100px auto;
width: 250px;
height: auto;
background-color: cornflowerblue;
}
span {
padding: 10px;
}
a {
background-color: black;
display: block;
text-decoration: none;
color: chartreuse;
padding: 10px;
}
a:hover {
background-color: chocolate;
}
.menu {
padding-top: 10px;
text-align: justify;
}
.collapsed {
height: 21px;
overflow: hidden;
}
</style>
<script src="../myjstools/tools.js"></script>
<script>
window.onload = function() {
var menu = document.getElementsByTagName("span"); // 应该绑定span 因为 会 覆盖到整个div 如果绑定div
var openDiv = menu[0].parentNode;
for (var i = 0; i < menu.length; i++)
menu[i].onclick = function() {
var parentDiv = this.parentNode;
toggleClass(parentDiv, "collapsed");
if (parentDiv == openDiv)
return;
addClass(openDiv, "collapsed"); // 重新打开页面时会弹出false
openDiv = parentDiv;
};
};
</script>
</head>
<body>
<div id="myMenu">
<div class="menu">
<span class="menuSpan">在线工具</span>
<a href="#">你猜</a>
<a href="#">你猜</a>
<a href="#">你猜</a>
</div>
<div class="menu collapsed">
<span class="menuSpan">支持我们</span>
<a href="#">合作</a>
<a href="#">合作</a>
<a href="#">合作</a>
<a href="#">合作</a>
</div>
<div class="menu collapsed">
<span class="menuSpan">测试电流</span>
<a href="#">not</a>
<a href="#">not</a>
<a href="#">not</a>
<a href="#">not</a>
</div>
</div>
</body>
</html>
当同时关闭三个div时 并且再打开其他另外两个中的任一个时就会弹出false
