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private function getResults(event:ResultEvent):void{
    if(this.getUsers.lastResult.users.user is ObjectProxy){
        userResults=new ArrayCollection();
        userResults.addItem(event.result.users.user);
    }else{
        userResults=event.result.users.user;

userResults.addEventListener(CollectionEvent.COLLECTION_CHANGE,function(event:CollectionEvent){
    Alert.show("列表数据已变化");
    Alert.show(">>"+(event.items[0] as PropertyChangeEvent).oldValue);
});

// userResults=event.result.users.user;
userResults=new ArrayCollection(event.result.users.user.toArray());