Question

如何在AS3中获取1970年1月1日午夜以来的当前毫秒数，而无需使用“新”运算符？我问，因为我需要每秒执行大约100次，并且当前尝试减少堆分配以保持gc低。

Answer 1

我使用的方法：

// Get time since the epoch and time since the VM was started
private static const dateTime:Number = new Date().time;
private static const dateTimestamp:uint = getTimer();
/**
 * Current time in ms
 */ 
public static function getCurrentTime():Number
{
    return dateTime + (getTimer() - dateTimestamp);
}

Answer 2

你应该创建一次然后添加毫秒，这是自创建以来用getTimer（）传递的;您还需要一个帮助变量来存储您的数据创建时间;

package 
{
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.utils.getTimer;

    public class Main extends Sprite 
    {
        private var _myLittleDate:Date;
        private var _myLittleDateCreationTime:Number;

        public function Main():void 
        {
            _myLittleDate = new Date(); //Our first and only object creation
            _myLittleDateCreationTime = getTimer(); //Store it's creation time
            addEventListener(Event.ENTER_FRAME, onEnterFrame); //Check function
        }

        private function onEnterFrame(e:Event):void 
        {
            _myLittleDate.time += ( getTimer() - _myLittleDateCreationTime );
            trace(_myLittleDate); //You get valid, refreshed data object here
            _myLittleDateCreationTime = getTimer(); // Don't forget to update your initial time
            //It's accurate since method .getTimer() is accurate itself
            //You can even compare two Data object by creating another and tracing it right here
        }
    }
}

如果您只需要知道自上一帧以来已经过了多少时间，而不知道一周中的某一天或一年，您可以使用getTimer（）;在它自己，它更有效

AS3获取当前时间而不创建新对象

2 个答案: