JS实现前端动态表格行号自增

<!-- 循环生成，列表数据 --> 
<c:forEach items="${pager.list}" var="auction"> 
<tr class="bg1"> 
<td width="10" align="center"><span class="numberClass"></span></td> 
<td width="30" align="center">${auction.dept}</td> 
<td width="40" align="center">${auction.donor}</td> 
<td width="40" align="center">￥：${auction.auctionSum}.00</td> 
<td width="40" align="center"><span onClick="displayDetails('xxxx}')" style="color:blue;cursor:pointer;">查看详细信息</span></td> 
</tr> 
</c:forEach>

$(function(){ 
function number(){ 
for(var i=0;i< $(".numberClass").length;i++){ 
$(".numberClass").get(i).innerHTML = i+1; 
} 
} 
number(); 
});