Flex 动态绑定BindingUtils.bindProperty

<?xml version="1.0" encoding="utf-8"?>?
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"?
layout="absolute" initialize="init();">?

<mx:Script>?
import mx.binding.utils.BindingUtils;?
import mx.binding.utils.ChangeWatcher;?


private var watcher1:ChangeWatcher;?
private var watcher2:ChangeWatcher;?

/**?
* 动态绑定?
* @return void?
* **/?
private function Binding():void {?

//绑定ID为txt2的txtInput?
//绑定属性为txtInput的text?
//监视者ID为txt1的txtInput?
//监视者属性为txtInput的text?
watcher1 = BindingUtils.bindProperty(txt2,"text",txt1,"text");?

//绑定ID为txtComb的txtInput?
//绑定属性为txtInput的text?
//监视者ID为comb的ComboBox?
//监视者属性为ComboBox的value?
watcher2 = BindingUtils.bindProperty(txtComb,comb,"value");?
}?

/**?
* 解除绑定?
* @return void?
* **/?
private function UnBinding():void {?
//解除绑定?
watcher1.unwatch();?
watcher2.unwatch();?
}?
</mx:Script>?

<mx:ApplicationControlBar dock="true">?
<mx:Button label="动态绑定" click="Binding();"/>?
<mx:Button label="解除绑定" click="UnBinding();"/>?
</mx:ApplicationControlBar>?



<mx:VBox width="200" height="200">?

<mx:Spacer height="30"/>?

<mx:TextInput id="txt1"/>?
<mx:TextInput id="txt2"/>?

<mx:Spacer height="30"/>?

<mx:ComboBox id="comb">?
<mx:dataProvider>?
<mx:Array>?
<mx:String>Beijing</mx:String>?
<mx:String>Shanghai</mx:String>?
<mx:String>Hangzhou</mx:String>?
</mx:Array>?
</mx:dataProvider>?
</mx:ComboBox>?

<mx:TextInput id="txtComb"/>?
</mx:VBox>?
</mx:Application>