<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jquery练习之左侧菜单栏</title>
<style>
.menu{
height: 300px;
width: 30%;
background-color: gainsboro;
float: left;
/*设置左侧菜单栏高500px，宽占屏幕30%，向左浮动*/
}
.content{
height: 300px;
width: 70%;
background-color: yellow;
float: left;
/*设置内容文本框高500px，宽占屏幕70%，向左浮动贴着菜单栏*/
}
.title{
line-height: 50px;
background-color: red;
color: forestgreen;
/*设置菜单样式*/
}
.hide{
display: none;
/*将菜单的子菜单隐藏起来*/
}
</style>
</head>
<body>
<div class="outer">
<div class="menu">
<div class="item">
<div class="title">菜单一</div>
<div class="con hide">
<div>111</div>
<div>111</div>
<div>111</div>
</div>
</div>
<div class="item">
<div class="title">菜单二</div>
<div class="con hide">
<div>222</div>
<div>222</div>
<div>222</div>
</div>
</div>
<div class="item">
<div class="title">菜单三</div>
<div class="con hide">
<div>333</div>
<div>333</div>
<div>333</div>
</div>
</div>
</div>
<div class="content">内容文本区域</div>
</div>
<script src="jquery-3.3.1.js"></script>
<script>
$('.item .title').click(function () {
$(this).next().removeClass('hide');
$(this).parent().siblings().children('.con').addClass('hide');
});
</script>
</body>
</html>