Ext Grid checkBox 监听事件

1. new Ext.grid.CheckboxSelectionModel({  
2.     listeners:{  
3.       'rowselect':function(sm,rowIndex,record){  
4.         console.log('rowselect',rowIndex)  
5.       },  
6.       'rowdeselect':function(sm,rowIndex,record){  
7.         console.log('rowdeselect',rowIndex)  
8.       },  
9.       'selectionchange':function(sm){  
10.         console.log('selectionchange',sm.getSelections().length);  
11.       }  
12.     }