Flex中Number取整数学运算
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="init()">
<mx:Script>
<![CDATA[
private function init():void{
/**ceil 向前(数轴向右)取整(返回值为Number)**/
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 向后(数轴向左)取整(返回值为Number)**/
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 整数四舍五入，负数五舍六入(返回值为Number)**/
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

/**toFixed 正负数都四舍五入(返回值为String)**/
trace(new Number(4).toFixed(3)); //4.000
trace(new Number(3.85742).toFixed(3)); //3.857
trace(new Number(3.85752).toFixed(3)); //3.858
trace(new Number(-3.85742).toFixed(3)); //-3.857
trace(new Number(-3.85752).toFixed(3)); //-3.858
}

]]>
</mx:Script>

</mx:Application>