FLEX/获得textinput的字节byte

//获得字节,一个汉字2个字节，英文，数字一个字节 

private function getStrActualLen(sChars:String) : int { 

return sChars.replace(/[^\x00-\xff]/g,"xx").length; 

} 

var hw_model_namelength        = getStrActualLen(hw_model_name.text);

Alert.show(hw_model_namelength );

 <mx:TextInput id="hw_model_name" text="" width="140" />