关于input表单的问题 如何让值在原来的基础上通过数量调节以X2的倍数递增
这是源代码:
<div class="Numinput" style="padding:0px 25px 3px 0px;float: right;">
<input type="text" name="goods[num]" id="<{$product.goods_id}>" size="4" value=1 />
<span class="numadjust increase" onclick="document.getElementById('<{$product.goods_id}>').value++;" ></span>
<span class="numadjust decrease" onclick="document.getElementById('<{$product.goods_id}>').value--;"></span>
贵求大哥大姐们帮忙解决一下,谢谢