flex取整运算
转自：http://hi.baidu.com/wosinmaiken/blog/item/ee59f7a8f72604bdca130c24.html
/**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
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