php的script提交参数不跳转页面的问题

[jackiezzp]

按钮：<a href="javascript:add_to_cart({$rgoods.goods_id},1);"><input value="加入购物车" name="Submit" type="button" class=" red_btn" style="width:98%; font-size:14px; height:25px"></a>

<script type="text/javascript">
//<!CDATA[
/* buy */

function add_to_cart(spec_id, quantity)
{
var url = SITE_URL + '/index.php?app=cart&act=add';
$.getJSON(url, {'spec_id': spec_id, 'quantity': quantity}, function (data) {
if (data.done)
{
$('.bold_num').text(data.retval.cart.kinds);
$('.bold_mly').html(price_format(data.retval.cart.amount));
$('.ware_cen').slideDown('slow');
setTimeout(slideUp_fn, 5000);
}
else
{
alert(data.msg);
}
});
}
</script>



点击以上“加入购物车”按钮没反应，那位大侠帮解决下啊，我是个菜鸟。