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