flex如何获取到当前月份的最后一天

 

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="defaultYm()">  <mx:Script>  <![CDATA[ import mx.controls.Alert;   import mx.states.SetStyle;   import flash.sampler.NewObjectSample;     private function  defaultYm():void{      var nowDate:Date = new Date();     var nowyear:String = nowDate.getFullYear().toString();     var nowmonth:String = (nowDate.getMonth()+1).toString().length == 1?"0"+(nowDate.getMonth()+1).toString():(nowDate.getMonth()+1).toString();        var lastdaysOfMonth:String = daysOfMonth(nowyear+nowmonth);       Alert.show("当月最后一天"+lastdaysOfMonth);  }      function daysOfMonth(Month):String{      var currentMonth=new Date(Month.substring(0,4),Month.substring(4,6),1);      var lastMonth=new Date(Month.substring(0,4),Month.substring(4,6)-1,1);      var diffDays=currentMonth-lastMonth;        return ""+(diffDays/( 24 * 60 * 60 * 1000));   }    ]]> </mx:Script>   </mx:Application>