1、easyUI初始化，启用汇总列，showFooter:true

2、后台json有默认的footer的值

{"total":28,"rows":[    {"productid":"FI-SW-01","unitcost":10.00,"status":"P","listprice":36.50,"attr1":"Large","itemid":"EST-1"},    {"productid":"K9-DL-01","unitcost":12.00,"status":"P","listprice":18.50,"attr1":"Spotted Adult Female","itemid":"EST-10"},    {"productid":"RP-SN-01","unitcost":12.00,"status":"P","listprice":28.50,"attr1":"Venomless","itemid":"EST-11"},    {"productid":"RP-SN-01","unitcost":12.00,"status":"P","listprice":26.50,"attr1":"Rattleless","itemid":"EST-12"},    {"productid":"RP-LI-02","unitcost":12.00,"status":"P","listprice":35.50,"attr1":"Green Adult","itemid":"EST-13"},    {"productid":"FL-DSH-01","unitcost":12.00,"status":"P","listprice":158.50,"attr1":"Tailless","itemid":"EST-14"},    {"productid":"FL-DSH-01","unitcost":12.00,"status":"P","listprice":83.50,"attr1":"With tail","itemid":"EST-15"},    {"productid":"FL-DLH-02","unitcost":12.00,"status":"P","listprice":63.50,"attr1":"Adult Female","itemid":"EST-16"},    {"productid":"FL-DLH-02","unitcost":12.00,"status":"P","listprice":89.50,"attr1":"Adult Male","itemid":"EST-17"},    {"productid":"AV-CB-01","unitcost":92.00,"status":"P","listprice":63.50,"attr1":"Adult Male","itemid":"EST-18"}],"footer":[{"unitcost":合计,"listprice":0}]}

3、前台获取footer的值，然后修改，再刷新

onLoadSuccess: function (data) {
   //表单加载完后再加载此方法                sumline(data);            }

//汇总列        function sumline(data) {            // var rows = $('#dg').datagrid('getRows')//获取当前的数据行            var ptotal = 0//            for (var i = 0; i < data.rows.length; i++) {                ptotal += parseInt(data.rows[i].listprice);            }            //新增一行显示统计信息            //$('#list').datagrid('appendRow', { strLearningDutyName: '合计：', trainingNum: ptotal, strTrainingTimes: utotal });            var rows = $('#list').datagrid('getFooterRows');            rows[0]["listprice"] = ptotal;            $('#list').datagrid('reloadFooter');        }