<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.hide{
display:none;
}
.item .header{
height:35px;
background:grey;
color: orange;
line-height: 35px;
}
</style>
</head>
<body>
<div style="height:48px"></div>
<div style="width: 300px;">
<div class="item">
<div id="i1" class="header" onclick="ChangeMenu(‘i1‘)">菜单一</div>
<div class="content">
<div>内容一</div>
<div>内容二</div>
<div>内容三</div>
</div>
</div>
<div class="item">
<div id="i2" class="header" onclick="ChangeMenu(‘i2‘)">菜单2</div>
<div class="content hide">
<div>内容1</div>
<div>内容2</div>
<div>内容3</div>
</div>
</div>
<div class="item">
<div id="i3" class="header" onclick="ChangeMenu(‘i3‘)">菜单3</div>
<div class="content hide">
<div>内容1</div>
<div>内容2</div>
<div>内容3</div>
</div>
</div>
</div>
<script>
function ChangeMenu(nid) {
var current_header = document.getElementById(nid);
var item_list = current_header.parentElement.parentElement.children;
for(var i=0;i<item_list.length;i++){
current_item = item_list[i];
current_item.children[1].classList.add(‘hide‘);
}
//当前的兄弟的下一个div去掉hide
current_header.nextElementSibling.classList.remove(‘hide‘);
}
</script>
</body>
</html>原文：https://www.cnblogs.com/w-sir/p/15220111.html