easyui动态生成双列头

实习时老大交给任务,让我做这样一个效果,选择日期并点击查询时,动态生成列头,下一列要求对应日期的星期.

效果图:

下面贴出查询的单击函数:

//查询按钮

        function queryByDate(){

            var begin_Date=$('#dateid').datebox('getValue')+"-01";

            var year=begin_Date.substring(0,4);//获取年

            var month=begin_Date.substring(5,7);//获取月

            var max=new Date(year,month,0).getDate(); //选中年月的最大天数

            var columns = [];

            var col = [];

            var col2=[];

             $.ajax({

                       type:"post",

                       url:"/mylog/mobileManage/select.do",

                       dataType:"json",

                       data:{begin_Date:begin_Date},

                       success:function(data){

                           var json = eval("(" + data + ")");

                           col.push({title:"类型",rowspan:2,width:60,field:'type'});

                              col.push({title:"姓名",rowspan:2,width:60,field:'name'});

                             for(var i=1;i<=max;i++){

                           var field='code'+i;

                               var c1 = {title:i,width:40,rowspan:1};

                               var week=getDateWeek(year,month,i);

                               var c2={align:'center',title:week,width:40,rowspan:1,field:field};

                               col.push(c1);

                               col2.push(c2);

                           }

                          columns[0]=col;

                          columns[1]=col2;

                           $('#dg').datagrid({title:"员工工作详情",columns:columns});

                           $('#dg').datagrid('loadData',json);

                           //$('#dg').datagrid('reload');

                       }

                   }) ;

        }

function getDateWeek(year,month,day)

        {

            var dateInfo = new Date(year, month-1, day);

            var week = "";

             switch(dateInfo.getDay())

             {

                case 0:

                    week="日";

                    break;

                case 1:

                    week="一";

                    break;

                case 2:

                    week="二";

                    break;

                case 3:

                    week="三";

                    break;

                case 4:

                    week="四";

                    break;

                case 5:

                    week="五";

                    break;

                case 6:

                    week="六";

                    break;

             }

             return week;

        }