jquery 表格行计算

表格行计算 总金额：
     function jisuanTrJinE(obj){
            var curTab = $(obj).closest("table");
             var curTr = $(obj).closest("tr");
            var curTabId = curTab.attr("id");
            var zongJinE = 0;
            //alert(curTabId);

             var danjia =  curTr.find("input[class='danjia']").val();
             var shuliang =  curTr.find("input[class='shuliang']").val();
             if(danjia==""){ danjia=0;}
             if(shuliang==""){ shuliang=0;}
             zongJinE = danjia*shuliang;

            curTr.find("input[class='jinE']").val(zongJinE);

     }