添加一条数据如何让数据在最前面，前台用的extjs

addJitWhinfo : function(){
var me=this;
var win=Ext.create('AM.view.jit.JitWhinfoAdd').show();
//store.insert(0, win);

win.setTitle("新增jit业务信息");
},

http://docs.sencha.com/extjs/4.1.3/#!/api/Ext.data.Store-method-insert

 insert( index, records ) : Ext.data.Model[]
Inserts Model instances into the Store at the given index and fires the add event. See also add.

Available since: 1.1.0

Parameters
index : Number
The start index at which to insert the passed Records.
records : Ext.data.Model[]
An Array of Ext.data.Model objects to add to the store.
Returns
Ext.data.Model[]
records The added records
Fires
add
beforesort
beforesync
datachanged