<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.hide{
display: none;
}
.menu {
height: 48px;
background-color: #DDDDDD;
line-height: 48px;
}
.item{
float: left;
height: 48px;
line-height: 48px;
padding: 0 40px;
/*这里加框线的话会让下一列的内容一居中，*/
border: 1px solid #47a447;
cursor:pointer;
}
.content{
width: 700px;
height: 500px;
background-color: #1d9ad6;
}
.active{
background-color: red;
color: black;
}
</style>
</head>
<body>
<div style="width: 700px;height:900px;margin: 0 auto ;background-color: #DDDDDD">
<div class="menu">
<div class="item" q="1">菜单1</div>
<div class="item" q="2">菜单1</div>
<div class="item" q="3">菜单1</div>
</div>
<div class="content">
<div b="1">内容1</div>
<div class="hide" b="2">内容2</div>
<div class="hide" b="3">内容3</div>
</div>
</div>
<script src="jquery.js"></script>
<script>
$('.item').click(function () {
$(this).addClass('active').siblings().removeClass('active');
var n = $(this).attr('q');
// $('.content ').children("[b='"+n+"']").addClass().removeClass('hide').siblings().addClass('hide')
// $("[b='"+n+"']").addClass().removeClass('hide').siblings().addClass('hide')；
$('.content').children().eq($(this).index()).removeClass('hide').siblings().addClass('hide');
})
</script>
</body>
</html>
