flex的取整(取数)数学运算实例

 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
         }

转自：http://hi.baidu.com/wosinmaiken/item/8c4bfa9b76eb048a5914617d