js数量添加

<div class="fl shop-num ml24"><input type="button" style=" border-right:0px;" onClick="disNum(this)" value="-"><input type="text" value="1"  onkeyup="value=value.replace(/[^\d]/g,'1')"/><input type="button" value="+" style="border-left:0px;" onClick="incNum(this)"></div>

//text只能输入数字

<script>
function disNum(dom){
var disNum=dom.nextSibling.value;
if(disNum<2)//防止数量少于1
{
dom.nextSibling.value=1;
}
else
{
dom.nextSibling.value--;
}
}

function incNum(dom){
dom.previousSibling.value ++;

}

</script>