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bindProperty() ·½·¨ÊÇÓÃÓڰ󶨹²ÓÐÊôÐԵľ²Ì¬·½·¨¡£
bindSetter() ·½·¨ÊÇÓÃÓÚ°ó¶¨setterº¯ÊýµÄ¾²Ì¬·½·¨¡£
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public static function bindProperty(
site:Object, prop:String,
host:Object, chain:Object,
commitOnly:Boolean = false,
useWeakReference:Boolean = false):ChangeWatcher
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useWeakReference ²ÎÊýÔÊÐíÄ㶨Òåµ½Ö÷»úµÄÒýÓÃÊÇstrong»¹ÊÇweak¡£strong ÒýÓÃ(ĬÈÏ) Äܹ»·ÀÖ¹Ö÷»ú±»À¬»øÊÕ¼¯¡£¶øweak ÒýÓò»ÄÜ×öµ½ÕâÒ»µã¡£ÏÂÃæµÄ·¶Àý°üº¬Ò»¸ötextÊäÈë³ÌÐòºÍÒ»¸ö¼òµ¥×é¼þ¡£µ±¶Ô TextInput ¿Ø¼þ½øÐÐÔ¤³õʼ»¯Ê±£¬µ÷ÓÃʹÓà bindProperty ·½·¨µÄ preinitializeHandler() º¯Êý¡£
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
   xmlns:s="library://ns.adobe.com/flex/spark"
   xmlns:mx="library://ns.adobe.com/flex/mx"
   minWidth="1024" minHeight="768">
      <fx:Script>
         <![CDATA[
            import mx.binding.utils.BindingUtils;
            import mx.events.FlexEvent;
                                 
            protected funct


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private function getTextWidth():int
{
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