我需要一些关于时钟的建议

Question

我有一个工作时钟，但我需要它来倒计时，而不是运行前进这是我目前正在使用的代码

 import flash.utils.Timer;  
 import flash.events.TimerEvent;  

 var looper: Timer = new Timer(100);  
 looper.start();  
 looper.addEventListener(TimerEvent.TIMER, loopF);
 function loopF(event:TimerEvent):void{  
 var time: Date = new Date(); 

 //time variables

 var hours:* = time.getHours();  
 var minutes:* = time.getMinutes();  
 var seconds:* = time.getSeconds();  
 var hourStrg:String;   
 var minuteStrg:String;
 var secondStrg:String;

 //time text

if(String(seconds).length < 2){
seconds = "0" + seconds;
}
if(String(minutes).length < 2){
minutes = "0" + minutes;
}
if(hours > 11){
ampm_txt.text = "PM";
} else {
ampm_txt.text = "AM";
}
if(hours > 12){
hours = hours - 12;
}
if (String(hours).length < 2){
hours = "0" + hours;
} 
time_txt.text = hours + ":" + minutes + ":" + seconds;

}

也许有人知道一种将其更改为倒计时的简单方法

Answer 1

根据您的代码，您可以执行如下操作：在启动计时器之前创建一个全局 Date 对象，并将计时器的延迟设置为 1000 毫秒。

在定时器的回调函数中，我们可以获得定时器自启动以来被触发的次数。有了这个数字（以及定时器每秒触发一次的知识），我们可以简单地从全局 Date 对象中减去这个值乘以 1000，使其倒数。

import flash.utils.Timer;  
import flash.events.TimerEvent;  

var looper:Timer = new Timer(1000);  
var now:Date=new Date();
looper.start();  
looper.addEventListener(TimerEvent.TIMER, loopF);
function loopF(event:TimerEvent):void{  
    var time:Date = new Date(now.getTime() - Timer(event.currentTarget).currentCount * 1000); 

    //time variables

    var hours:* = time.getHours();  
    var minutes:* = time.getMinutes();  
    var seconds:* = time.getSeconds();  
    var hourStrg:String;   
    var minuteStrg:String;
    var secondStrg:String;

    //time text

    if(String(seconds).length < 2){
        seconds = "0" + seconds;
    }
    if(String(minutes).length < 2){
        minutes = "0" + minutes;
    }
    if(hours > 11){
        ampm_txt.text = "PM";
    } else {
        ampm_txt.text = "AM";
    }
    if(hours > 12){
        hours = hours - 12;
    }
    if (String(hours).length < 2){
        hours = "0" + hours;
    } 
    time_txt.text = hours + ":" + minutes + ":" + seconds;

}

我需要一些关于时钟的建议

I need some suggetions on a clock

actionscript-3