jquery table 的datagrid方法

 function getpage(_page, _queryon) {
            $("#norecord").html("");//清空无记录信息
            $.post("GetRoles", { page: _page, queryon: _queryon },
              function (re) {
                  var re = eval(re);
                  currentpage = re.currentpage;
                  totalpage = re.totalpage;
                  totalrole = re.totalroles;
                  $("#roletable").datagrid({
                      columns: [[
                           { title: "角色名", field: "RoleName" }
                         , {title: "角色描述", field: "RoleDescription" }       
                      ]]
                  }).datagrid("loadData", { rows: re.data });
                 
                  }
              }// function of call back
               );//post to get page
        };