flex的取整(取数)数学运算实例

<?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 ???????? }