[Flex] flex计时器的使用(timer)

用timer可以达到很多功能，定时调用函数，模拟时钟走等等。

定时调用函数：

var myTimer:Timer = new Timer(50, 1); //设定50毫秒，每次走一毫秒

myTimer.addEventListener(TimerEvent.TIMER_COMPLETE, handle); //到达计时器终点时调用这个函数

myTimer.start();

private function readPreAnswer( evt:TimerEvent ):void

{

Alert.show("Time reach to this function.");

}

计时功能：

private var hour_timer:Number=0;

private var minute_timer:Number=0;

private var second_timer:Number=0;

private var handleTimer:Timer;

private var currentHours:String;

public function timerInit():void

{

this.hour_timer = Number("2");

this.minute_timer = Number("00");

this.second_timer = Number("00");

handInTimer = new Timer( 1000 );

handInTimer.addEventListener( "timer" , timerHandler);

handInTimer.start();

}

private function timerHandler(event:TimerEvent):void

{

second_timer--;

if (second_timer<0){second_timer=59;minute_timer--;}

if (minute_timer<0){minute_timer=59;hour_timer--;}

currentHours="0"+String(hour_timer)+":";

if (minute_timer<10){currentHours+="0"+String(minute_timer)+":";}else{currentHours+=String(minute_timer)+":";}

if (second_timer<10){currentHours+="0"+String(second_timer);}else{currentHours+=String(second_timer);}

}

currentHour即会随着时间的推移开始从2:00:00倒数，要想让计时停止，只要调用handInTimer.stop()即可。