combo,raido

// The data store containing the list of states
var states = Ext.create('Ext.data.Store', {
    fields: [],  //store 的 fields属性可以为空
                 //combo可以根据data来创建model
    data : [
        {"abbr":"AL", "name":"Alabama"},
        {"abbr":"AK", "name":"Alaska"},
        {"abbr":"AZ", "name":"Arizona"}
        //...
    ]
});



{
    xtype:'combo',
    id:'myCombo',
    fieldLabel: 'Choose State',
    store: states,
    queryMode: 'local',  //默认为remote , 所以，要改成local
    displayField: 'name',
    valueField: 'abbr',
}



log( Ext.getCmp('myCombo').getValue() );     //AK   valueField
log( Ext.getCmp('myCombo').getRawValue() );  //Alaska  displayField

Ext.getCmp('myCombo').setValue();   //参数应该是valueField，其displayField会跟着改变

由以上代码可知，combo的getValue 方法获取的是valueField ,getRawValue获取的是displayField