数字加减控件实现

.gw_num{border: 1px solid #dbdbdb;width: 110px;line-height: 26px;overflow: hidden;}
.gw_num em{display: block;height: 26px;width: 31px;float: left;color: #7A7979;border-right: 1px solid #dbdbdb;text-align: center;cursor: pointer;font-style:normal;}
.gw_num .num{display: block;float: left;text-align: center;width: 42px;font-style: normal;font-size: 14px;line-height: 24px;border: 0;}
.gw_num em.add{float: right;border-right: 0;border-left: 1px solid #dbdbdb;}

<tbody>
<c:forEach items="${uservos}" var="uservo">
<tr>
<td >${uservo.username}<input type="hidden" name="names" value="${uservo.username}"/></td>

<td align="center">
<div class="gw_num">
<em class="jian">-</em>
<input type="text" value="${uservo.score==null?100:uservo.score}"  name="scores" class="num" readonly/>
<em class="add">+</em>
</div>
</td>
</tr>
</c:forEach>
</tbody>

$(".add").click(function(){
var n=$(this).prev().val();
var num=parseInt(n)+1;
if(num>120){ return;}
$(this).prev().val(num);
});
//减的效果
$(".jian").click(function(){
var n=$(this).next().val();
var num=parseInt(n)-1;
if(num<60){ return;}
$(this).next().val(num);
});