fix express fee bug when use yohocorn

@@ -365,7 +365,7 @@ var Order = {
             function getSelectData(callback) {
 
                 var $juangroupInput = $('.play-juan.is-select input[name="juangroup"]:checked');
-                var expressVal = $('.express-list input[name="carriagegroup"]').val();
+                var expressVal = $('.express-list input[name="carriagegroup"]:checked').val();
                 var biVal = $('#biprice.is-select').val();
                 var codeVal = $juangroupInput.val();
                 var cartType = $('.address-manage').attr('cart-type');