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ת×Ô£ºhttp://hi.baidu.com/wosinmaiken/blog/item/ee59f7a8f72604bdca130c24.html
 /**ceil   Ïòǰ(ÊýÖáÏòÓÒ)È¡Õû(·µ»ØÖµÎªNumber)**/
         trace(Math.ceil(10.4));    //11
         trace(Math.ceil(10.5));    //11
         trace(Math.ceil(-10.4));    //-10
         trace(Math.ceil(-10.5));    //-10
        
         /**floor   Ïòºó(ÊýÖáÏò×ó)È¡Õû(·µ»ØÖµÎªNumber)**/
            trace(Math.floor(300.4));    //300
            trace(Math.floor(300.5));    //300
            trace(Math.floor(-300.4));    //-301
            trace(Math.floor(-300.5));    //-301
           
            /**round   ÕûÊýËÄÉáÎåÈ룬¸ºÊýÎåÉáÁùÈë(·µ»ØÖµÎªNumber)**/
            trace(Math.round(8000.4));    //8000
            trace(Math.round(8000.5));    //8001
            trace(Math.round(-8000.4));    //-8000
            trace(Math.round(-8000.5));    //-8000
            trace(Math.round(-8000.6));    //-8001
   


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Flex Builder 3 ÏÂÔØ°²×°Óë×¢²áÂë

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<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
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Flex ¼ÆËãStringµÄ¿í¶È

ӦΪÉè¼ÆÒªÇó, ÎÒÐèÒª¼ÆËãStringµÄ¿í¶È,
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ʼÖÕ·µ»ØÍ¬Ò»¸öÖµ, Ò²ÐíÊÇÎÒµÄÓ÷¨²»¶Ô, ×îºóÎÒûÓÐÕâ¸ö·½·¨,
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private function getTextWidth():int
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       http://www.cnblogs.com/nianshi/archive/2010/05/19/1739407.html £¬ FLEX ......
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