<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="jquery-3.4.1.js"></script>
<script>
function f(self) {
$(self).next().removeClass("hide");
$(self).parent().siblings().children(".son").addClass("hide");
}
</script>
<style>
.div1{
width: 100%;
height: 1000px;
}
.menu{
float: left;
background-color: navajowhite;
width: 20%;
height: 500px;
}
.content{
float: left;
background-color: #dec7f4;
width: 80%;
height: 500px;
}
.title{
background-color: #339900;
line-height: 30px;
}
.hide{
display: none;
}
</style>
</head>
<body>
<div class="div1">
<div class="menu">
<div class="item">
<div class="title" onclick="f(this)">菜单一</div>
<div class="son hide" >
<div>111</div>
<div>222</div>
<div>333</div>
</div>
</div>
<div class="item">
<div class="title" onclick="f(this)">菜单二</div>
<div class="son hide">
<div>111</div>
<div>222</div>
<div>333</div>
</div>
</div>
<div class="item">
<div class="title" onclick="f(this)">菜单三</div>
<div class="son hide">
<div>111</div>
<div>222</div>
<div>333</div>
</div>
</div>
</div>
<div class="content"></div>
</div>
</body>
</html>
