<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#box{
background-color: green;
border-radius: 20px;
padding: 10px;
height: 800px;
width: 450px;
margin: 20px auto;
}
ul,li{
margin: 0;
padding: 0;
list-style-type: none;
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ul{
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li{
background-color: yellow;
height: 120px;
width:120px;
float: left;
margin: 10px;
text-align: center;
color:blueviolet;
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#bottom{
margin: 10px;
}
.active{
background-color: crimson;
}
</style>
</head>
<body>
<div id="box">
<ul>
<li class="active"><h2>一月</h2><p>January </p></li>
<li><h2>二月</h2><p>February </p></li>
<li><h2>三月</h2><p>March </p></li>
<li><h2>四月</h2><p> April </p></li>
<li><h2>五月</h2><p> May </p></li>
<li><h2>六月</h2><p>June</p></li>
<li><h2>七月</h2><p>July </p></li>
<li><h2>八月</h2><p>August</p></li>
<li><h2>九月</h2><p>September </p></li>
<li><h2>十月</h2><p> October </p></li>
<li><h2>十一月</h2><p> November </p></li>
<li><h2>十二月</h2><p>December</p></li>
</ul>
<div id="bottom">
<h2>一月</h2>
<p>天气很好，去哪里玩呢？？？</p>
</div>
</div>
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var bottom=document.getElementById("bottom");
var li=box.getElementsByTagName("li");
for (var i=0;i<li.length;i++) {
li[i].index=i;
var arr=["一月吃牛排","二月吃意面","三月看帅哥","四月看星星"
,"五月吃猪蹄","六月吃西瓜","七月吃雪糕","八月吹空调","九月捡树叶","十月吃烤鸡",
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bottom.innerHTML='<h2>'+(this.index +1)+'月活动 </h2><p>'+arr[this.index]+'</p>';
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</script>
</body>
</html>