在项目需要做个部门切换，在选中用户所在部门的列表中，要对默认选中当前登录的部门
数据已经出来了，但是同事提供过来的的只是默认选择第一条记录。我还是先查下文档，
在Ext.selection.Model里面有个
select( Ext.data.Model[]/Number records, [Boolean keepExisting], [Boolean suppressEvent] )
Selects a record instance by record instance or index.
可以通过index进行选择，而deptGrid.getSelectionModel()得到是Ext.selection.Model
因为一个用户所在的部门数量不多，所以在store里通过属性去查找当前所在的部门，获得该条记录的index，就可以实现默认选中。
findRecord( String fieldName,
String/RegExp value, [Number startIndex], [Boolean anyMatch], [Boolean caseSensitive], [Boolean exactMatch] ) :
Ext.data.Model
Finds the first matching Record in this store by a specific field value.
When store is filtered, finds records only within filter.
Parameters
- fieldName : String
The name of the Record field to test.
- value : String/RegExp
Either a string that the field value should begin with, or a RegExp to test against the field.
- startIndex : Number (optional)
The index to start searching at
Defaults to:
0 - anyMatch : Boolean (optional)
True to match any part of the string, not just the beginning
Defaults to:
false - caseSensitive : Boolean (optional)
True for case sensitive comparison
Defaults to:
false - exactMatch : Boolean (optional)
True to force exact match (^ and $ characters added to the regex).
Defaults to:
false
Returns
- Ext.data.Model
The matched record or null
可能这只是其中的一种方法，特此记录下来。