extjs RadioGroup 的设值 和取值

Ext.override(Ext.form.RadioGroup, {    getValue : function() {        var v;        this.items.each(function(item) {            if (item.getValue()) {                v = item.getRawValue();                return false;}});return v;},setValue : function(v) {if (this.rendered) {this.items.each(function(item) {item.setValue(item.inputValue == v);});} else {for (var k in this.items) {this.items[k].checked = this.items[k].inputValue == v;}}}});