<script language="javascript">
function rolling(){
var maxNum = 4;
var minNum = 1;
var n = Math.floor(Math.random() * (maxNum - minNum + 1)) + minNum;
document.getElementById("center").innerHTML="<img src='images/" + n + ".jpg' width='90'>";
}
</script>
<body>
<table width="300" align="center">
<tbody>
<tr>
<td> </td>
<td id="top"><img src="images/white.png" width="90"></td>
<td> </td>
</tr>
<tr>
<td id="left"><img src="images/Ice_Block_icon.png" width="90"></td>
<td id="center"><img src="images/201592412105418.png" width="90"></td>
<td id="right"><img src="images/No.png" width="90"></td>
</tr>
<tr>
<td> </td>
<td id="bottom"><img src="images/heart-50-xxl.png" width="90"></td>
<td> </td>
</tr>
<tr>
<td> </td>
<td><input type="button" value="抽选" id="btn_rolling" onClick="rolling();"></td>
<td> </td>
</tr>
</tbody>
</table>
<p>
AllySu