js实现简单年历

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>年历</title>
<style type="text/css">
*{margin: 0;padding: 0;}
ul{margin: 0;padding: 0;}
.calender{
margin: 0px auto;
width: 400px;
height: 700px;
background-color: #ccc;
}
.calender ul{
margin: 5px auto;
width: 400px;
height: 550px;
/*border: 1px solid black;*/
list-style: none;

}
.calender ul li{
display: block;
width: 100px;
height: 100px;
margin: 15px;
background-color: red;
float: left;
text-align: center;

}
.calender ul .active{
background-color: white;
}
.calender .text{
width: 370px;
height: 150px;
margin-left: 15px;
}
</style>
<script type="text/javascript">
window.onload=function()
{
var arr=[
'快过年了，去哪玩啊',
'快开学了呢',
'你好啊老同学',
'44444',
'5555',
'6666',
'777',
'888',
'999',
'101010',
'11月',
'12月了'

];
var oDiv1=document.getElementById('tab')
var aLi=document.getElementsByTagName('li');
var oTxt=oDiv1.getElementsByTagName('div')[0];

for(var i=0;i<aLi.length;i++)
{
aLi[i].index=i;
aLi[i].onmouseover=function()
{
for(i=0;i<aLi.length;i++)
{
aLi[i].className='';
};
this.className='active';
oTxt.innerHTML='<h2>'+(this.index+1)+'月活动</h2><p>'+arr[this.index]+'</p>';

};
}
};
</script>
</head>
<body>
<div id="tab" class="calender">
<ul>
<li class="active"><h2>1</h2><p>JAN</p></li>
<li><h2>2</h2><p>FER</p></li>
<li><h2>3</h2><p>MAR</p></li>
<li><h2>4</h2><p>APR</p></li>
<li><h2>5</h2><p>MAY</p></li>
<li><h2>6</h2><p>JUN</p></li>
<li><h2>7</h2><p>JUL</p></li>
<li><h2>8</h2><p>AUG</p></li>
<li><h2>9</h2><p>SEP</p></li>
<li><h2>10</h2><p>OCT</p></li>
<li><h2>11</h2><p>NOV</p></li>
<li><h2>12</h2><p>DEC</p></li>
</ul>

<div class="text">
<h2>一月活动</h2>
<p>快过年了</p>
</div>

</div>
</body>

</html>

开始时，由于var oTxt=oDiv1.getElementsByTagName('div')[0];忘记具体定义是哪个数组了一直不能实现最下面的innerHTML部分，经过查找发现写成了var oTxt=oDiv1.getElementsByTagName('div'); 心塞塞

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