/**

 * 点选可选属性或改变数量时修改商品价格的函数

 */

 var goodsId = {$group_buy.goods_id};  // 参加团购产品的id，需要获取团购设置的初始价格

 var act_id = {$group_buy.act_id};  //   扩展类别属性

function changePrice()

{

  var attr = getSelectedAttributes(document.forms['ECS_FORMBUY']);

  var qty = document.forms['ECS_FORMBUY'].elements['number'].value;

  //alert('act=price&id=' + goodsId +'&act_id='+ act_id  + '&attr=' + attr + '&number=');

 Ajax.call('group_buy.php', 'act=price&id=' + goodsId +'&act_id='+ act_id  + '&attr=' + attr + '&number=' + qty, changePriceResponse, 'GET', 'JSON');

}

/**

 * 接收返回的信息

 */

function changePriceResponse(res)

{

  if (res.err_msg.length > 0)

  {

    alert(res.err_msg);

  }

  else

  {

    document.forms['ECS_FORMBUY'].elements['number'].value = res.qty;

    if (document.getElementById('ECS_GOODS_AMOUNT'))

      document.getElementById('ECS_GOODS_AMOUNT').innerHTML = res.result;

	  //alert(res.result);

  }

}

/*新增 商品点击效果*/

function changeAtt(t,src,key) {

	//alert(key);

	document.getElementById('spec_value_'+src).checked='checked';

	div = document.getElementById("EXP_"+key);

	elems = div.getElementsByTagName("dl")[0].getElementsByTagName("a");

	for(i=0;i<elems.length;i++){

		elems[i].className='';

	}

	t.className = "on";

	//elems[t].getElementsByTagName("span")[0].style.display="block";

	changePrice();

}

/*------------------------------------------------------ */

//-- 改变属性、数量时重新计算商品价格

/*------------------------------------------------------ */

elseif (!empty($_REQUEST['act']) && $_REQUEST['act'] == 'price')

{

    include('includes/cls_json.php');

    $goods_id = $_GET['id'];

    $act_id = $_GET['act_id'];

    $attr = $_GET['attr'];

    $attr = explode(',',$_GET['attr']);  // 注意这里传递过来的值，有可能是1个值或者2个值或者3个值，具体的要看扩展属性有几个阶梯

    foreach($attr as $v){

        $attr_price[] = group_attr($v);

    }

    $total_attr_price = array_sum($attr_price);  // 所有扩展分类的总价格

    $json   = new JSON;

    $res    = array('err_msg' => '', 'result' => '', 'qty' => );

    $attr_id    = isset($_REQUEST['attr']) ? explode(',', $_REQUEST['attr']) : array();

    $number     = (isset($_REQUEST['number'])) ? intval($_REQUEST['number']) : ;

    if ($goods_id == )

    {

        $res['err_msg'] = $_LANG['err_change_attr'];

        $res['err_no']  = ;

    }

    else

    {

        if ($number == )

        {

            $res['qty'] = $number = ;

        }

        else

        {

            $res['qty'] = $number;

        }

      // $shop_price  = get_final_price($goods_id, $number, true, $attr_id);

        $group_info = group_buy_info($act_id);  // 获得团购的最终价格

        $shop_price = $group_info['cur_price']+$total_attr_price;

        $res['result'] = price_format($shop_price * $number);

    }

    die($json->encode($res));

}
// 获取某个商品的扩展属性价格

function group_attr($goods_attr_id){

    $sql = 'select attr_price from '.$GLOBALS['ecs']->table('goods_attr').' where goods_attr_id='.$goods_attr_id;

    $result = $GLOBALS['db']->getOne($sql);

    return     floatval($result );

}

<script type="text/javascript">

var goods_id = {$goods_id};

var goodsattr_style = {$cfg.goodsattr_style|default:};

var gmt_end_time = {$promote_end_time|default:};

{foreach from=$lang.goods_js item=item key=key}

var {$key} = "{$item}";

{/foreach}

var goodsId = {$goods_id};

var now_time = {$now_time};

<!-- {literal} -->

onload = function(){

  changePrice();

  fixpng();

  try { onload_leftTime(); }

  catch (e) {}

}

/**

 * 点选可选属性或改变数量时修改商品价格的函数

 */

function changePrice()

{

  var attr = getSelectedAttributes(document.forms['ECS_FORMBUY']);

  var qty = document.forms['ECS_FORMBUY'].elements['number'].value;

  Ajax.call('goods.php', 'act=price&id=' + goodsId + '&attr=' + attr + '&number=' + qty, changePriceResponse, 'GET', 'JSON');

}

/**

 * 接收返回的信息

 */

function changePriceResponse(res)

{

  if (res.err_msg.length > )

  {

    alert(res.err_msg);

  }

  else

  {

    document.forms['ECS_FORMBUY'].elements['number'].value = res.qty;

    if (document.getElementById('ECS_GOODS_AMOUNT'))

      document.getElementById('ECS_GOODS_AMOUNT').innerHTML = res.result;

  }

}

<!-- {/literal} -->

/*新增 商品点击效果*/

function changeAtt(t,src,key) {

    //alert(key);

    document.getElementById('spec_value_'+src).checked='checked';

    div = document.getElementById("EXP_"+key);

    elems = div.getElementsByTagName("dl")[].getElementsByTagName("a");

    for(i=;i<elems.length;i++){

        elems[i].className='';

    }

    t.className = "on";

    //elems[t].getElementsByTagName("span")[0].style.display="block";

    changePrice();

}

if (!empty($_REQUEST['act']) && $_REQUEST['act'] == 'price')

{

    include('includes/cls_json.php');

    $json   = new JSON;

    $res    = array('err_msg' => '', 'result' => '', 'qty' => );

    $attr_id    = isset($_REQUEST['attr']) ? explode(',', $_REQUEST['attr']) : array();

    $number     = (isset($_REQUEST['number'])) ? intval($_REQUEST['number']) : ;

    if ($goods_id == )

    {

        $res['err_msg'] = $_LANG['err_change_attr'];

        $res['err_no']  = ;

    }

    else

    {

        if ($number == )

        {

            $res['qty'] = $number = ;

        }

        else

        {

            $res['qty'] = $number;

        }

        $shop_price  = get_final_price($goods_id, $number, true, $attr_id);

        $res['result'] = price_format($shop_price * $number);

    }

    die($json->encode($res));

}