ChangeWatcher 绑定用法【转载】

import mx.events.PropertyChangeEvent;
     import mx.binding.utils.ChangeWatcher;
     import mx.binding.utils.BindingUtils;
     import mx.controls.Alert;
       private var namewatcher:ChangeWatcher;
       private function init():void
       {
    namewatcher = BindingUtils.bindProperty(textArea,"text",person,"text");
ChangeWatcher.watch(textArea,"text",nameSetter); 
  //  textArea.addEventListener(Event.CHANGE,change); 
  //namewatcher.unwatch();
       }
       private function bindMe():void{
         namewatcher = BindingUtils.bindProperty(txt,"text", txtInp,"text");//前面属性跟着后面属性变化
       }
       private function unbindMe():void{
               namewatcher.unwatch();           
       }
       private function nameSetter(event:Event):void
       {
       Alert.show(event.toString());
       }
       private function change(event:Event):void
       {
       // Alert.show("changed");
       }
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