<?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>
