GridPanel中增添动态列

//根据传入时间参数，动态添加列var sd=params.sTime;
???var ed=params.eTime;

???var sy=sd.substr(0,4);
???var ey=ed.substr(0,4);
???
???var sm=Number(sd.substr(5,7));
???var em=Number(ed.substr(5,7));
???
???var count=12*(ey-sy)+(em-sm)+1;
???
???var dates=[];??
???
???var colModelTem =new Ext.grid.ColumnModel([
?????????????????? new Ext.grid.RowNumberer(),
?????????????????? new Ext.grid.CheckboxSelectionModel(),
????? {
??????????????????? header : "往来单位",
?????dataIndex : 'customerAll',
?????sortable : true,
?????width: 200,
?????align : 'left'
?????????????????? },{
??????????????????? header : "合计",
??????????? ??dataIndex : 'totalMoney',
??????????? ??sortable : true,
??????????? ??align : 'left'
?????????????????? },{
??????????????????? header : "多开发票金额",
?????dataIndex : 'invoicedMoney',
?????sortable : true,
?????align : 'left'
?????????????? }
??????????????? ]);
???
???var fields = ['customerAll','totalMoney','invoicedMoney'];
???
???//往数组里添加日期
???for(var i=0;i<count;i++){
????var months=parseInt(sm+i);
????if(months>12){
?????var year=parseInt((sm+i)/12);
?????var month=parseInt((sm+i)%12);
?????dates[i]=(sy+year)+'-'+month;
?????colModelTem.addColumn(dates[i],3+i);
?????fields.push(dates[i]);
????}else{
?????dates[i]=sy+"-"+months;
?????colModelTem.addColumn(dates[i],3+i);
?????fields.push(dates[i]);
????}
???}??
????//var json = this.getJsonDate(params);

????var storeTem? = new Ext.data.JsonStore({
?????autoLoad : true,
?????url : 'viewUnInvoiceSummaryItem',
?????remoteSort : true,
?????root : 'json.data',
?????totalProperty : 'json.totalCount',
?????fields : fields,
?????sortInfo : {
??????field : 'id',
??????direction : 'DESC'
?????? },
?????? baseParams : {
???????start : 0,
???????limit : commonPageSize,
?????? customerAll : params.customerAll,
?????????????????? sTime : params.sTime,
?????????????????? eTime : params.eTime?
?????}
??????? });
????this.reconfigure(storeTem,colModelTem);