extjs动态插入一列

 1  StdDayWordQuery:function(btn,event){       
 2         var form=Ext.getCmp('queryFormSDW');        
 3         var userNameORuserCode = form.getForm().getValues()['userNameORuserCode'];
 4         var gradeCode = form.getForm().getValues()['gradeCode'];
 5         var startDate = form.getForm().getValues()['startDate']; 
 6         var endDate = form.getForm().getValues()['endDate'];        
 7         
 8         var params="gradeCode="+gradeCode+'&';
 9         params+="userNameORuserCode="+userNameORuserCode+'&';
10         params+="startDate="+startDate+'&';
11         params+="endDate="+endDate;        
12         
13         Ext.Ajax.request({
14             method : 'POST',
15             url:'getDailyWordNum.action?'+params,
16             async:false,
17             success:function(response) {
18                 var ret=Ext.decode(response.responseText);
19 //                console.log(ret);
20                 if(ret.success){
21                     //eval("var res=" + response.responseText);
22                     //var rows = res.rows;
23                     var rows=Ext.decode(response.responseText).rows;
24                     var cols = new Array();
25                     var xx = new Array();
26                     console.log(rows);
27                     console.log(rows[0]);                  
28                     for(var x in rows[0]){
29                         //console.log(x);
30                         cols.push(new Ext.grid.column.Column({
31                             text: x,
32                             dataIndex : x
33                         }));
34                         xx.push(x);
35                     }
36                     console.log(xx);
37                     var store = new Ext.data.Store({
38                         fields: xx,
39                         data: rows
40                     });       
41                     var grid = Ext.getCmp('StudentDayWordGrid'); 
42                     grid.reconfigure(store,cols);
43                 }
44                 else{
45                     Ext.Msg.alert("错误", ret.msg);
46                 }                
47             }
48         });
49     },