1.  Action 的代碼

[HttpPost]
public ContentResult SaveData(List<ClsA> listA, List<ClsA> listB)
{
        return Content(string.Format("{0},{1}", listA.Count, listB.Count));
}

$.ajax({
                url: '@Url.Action("SaveData", "FulfillRequest")',
                type: 'POST',
                data: { "listA[0].Id": "1", "listA[0].Name": "Stone", "listB[0].Id": "2", "listB[0].Name": "LL"},
                success: function (result) {
                    alert(result);
                },
                error: function (result) {
                    alert(result);
                }
});

$.ajax({
                url: '@Url.Action("SaveData", "FulfillRequest")',
                type: 'POST',
                data: "listA[0].Id=1&listA[0].Name=Stone&listB[0].Id=2&listB[0].Name=LL",
                success: function (result) {
                    alert(result);
                },
                error: function (result) {
                    alert(result);
                }
});