thanhanlang Flash AS 30 Lam viec voi DATE va TIME

Returns the number of milliseconds since midnight January 1, 1970, universal time, for a Date object. Date[r]

LỚP DATE VÀ TIME

Ngày và giờ là một vấn ñề rất quan trọng trong các chương trình ứng dụng

Trong Flash AS 3.0 thời gian ñược tính theo ñơn vị miligiây và theo toạ ñộ thời gian UTC (Coordinated Universal Time ) với mốc thời gian là 0h 0 ph 0 giây ngày 01/01/1970

Lấy ngày giờ hiện tại của máy:

// Tạo một ñối tượng ngay

var current:Date = new Date( );

trace(“ngày hiện tại:”+current);

kết quả : ngày hiện tại Sat Sep 18 15:20:46 GMT+0700 2010

ví dụ :

var d:Date=new Date();

trace(d);

var count:Number=1;

var tTimer:Timer = new Timer(1000, 3);

tTimer.addEventListener(TimerEvent.TIMER, onTimer);

tTimer.start( );

function onTimer(event:TimerEvent):void {

var d1:Date=new Date();

trace("Goi ham lan "+count.toString()+" sau :"+(d1.time -d.time).toString()+" Miligiay." );

count++;

}

Kết quả:

Sat Sep 18 15:43:59 GMT+0700 2010

Goi ham lan 1 sau :1000 Miligiay

Goi ham lan 2 sau :2062 Miligiay

Goi ham lan 3 sau :3109 Miligiay

Một số thuộc tính :

fullYear : lấy năm ñầy ñủ , ví dụ 2010

date: ngày của tháng ( từ 1 ñến 31)

month: lấy tháng ( từ 0 ñến 11)

day: lấy ngày của tuần ( từ 0 ñến 6)

hours: lấy giờ (từ 0 ñến 23)

minutes : lấy phút (Từ 0 ñến 59)

seconds : lấy giây (Từ 0 ñến 59)

miliseconds: lấy giây (Từ 0 ñến 999)

Ví dụ :

var d:Date=new Date();

trace(d);

trace("d.month:="+d.month );

trace("d.day:="+d.day);

trace("d.date:="+d.date);

trace("d.fullYear:="+d.fullYear);

trace("d.hours:="+d.hours);

trace("d.minutes :="+d.minutes );

trace("d.seconds:="+d.seconds );

trace("d.milliseconds:="+d.milliseconds); Kết quả:

Sat Sep 18 16:19:35 GMT+0700 2010

d.month:=8

d.day:=6

d.date:=18

d.fullYear:=2010

d.hours:=16

d.minutes :=19

d.seconds:=35

d.milliseconds:=812

Ví dụ sau tính thời gian từ khi chương trình bắt ñầu chạy tới thời ñiểm hện tại tính theo mili giây: Lưu ý là trong ví dụ có dùng lớp Timer Timer có thể có 1 hay 2 tham số:

Timer(số mili giây chờ);

Timer( số mili giây chờ, số lần bộ ñếm thời gian thực hiện)

import flash.display.Sprite;

import flash.text.*;

import flash.utils.Timer ;

import flash.events.TimerEvent;

import flash.utils.getTimer;

var _text:TextField;

var _start:uint;

_start = getTimer( );

_text = new TextField( );

addChild(_text);

var timer:Timer = new Timer(1000);

timer.addEventListener(TimerEvent.TIMER, onTimer);

timer.start( );

function onTimer(event:TimerEvent):void {

_text.text = (getTimer( ) - _start) + " milliseconds"; }

Lưu ý : ðể hiển thị theo giờ , phút ,giây ta phải qui ñổi thời gian, Ví dụ sau minh hoạ thời gian ñếm ngược có qui ñổi thời gian Ở ñây sau khi hết thời gian ta cho timer dừng lại bằng cách dùng

_timer.stop() , nếu không timer vẫn ñếm và sẽ cho kết quả thời gian âm

import flash.display.Sprite;

import flash.text.*;

import flash.utils.Timer;

import flash.events.TimerEvent;

import flash.utils.getTimer;

var _text:TextField;

var _timer:Timer;

var _start:uint;

var _count:uint = 20;

_start = getTimer( );

_text = new TextField( );

var formatter1:TextFormat = new TextFormat( ); formatter1.font="Arial";

formatter1.size =20;

_text.defaultTextFormat= formatter1;

_text.y=stage.stageHeight/2;

_text.x=stage.stageWidth/2;

_text.width =150;

addChild(_text);

_timer = new Timer(500);

_timer.addEventListener(TimerEvent.TIMER, onTimer);

_timer.start( );

function onTimer(event:TimerEvent):void {

var elapsed:int = Math.round(_count - (getTimer( ) - _start) / 1000);

_text.text = elapsed + " seconds";

if(elapsed < 0) {

_text.text = " -";

_timer.stop( );

}

}

Kết quả :

Lớp thời gian còn nhiều thuộc tính tương tự như trong AS 2.0

Thuộc tính

The day of the month (an integer from 1 to 31) specified by a Date object according to local

time

Date

The day of the month (an integer from 1 to 31) of a Date object according to universal time

(UTC)

Date

[read-only] The day of the week (0 for Sunday, 1 for Monday, and so on) specified by this

Date according to local time

Date

[read-only] The day of the week (0 for Sunday, 1 for Monday, and so on) of this Date

according to universal time (UTC)

Date

The full year (a four-digit number, such as 2000) of a Date object according to local time Date

The four-digit year of a Date object according to universal time (UTC) Date

The hour (an integer from 0 to 23) of the day portion of a Date object according to local time Date

The hour (an integer from 0 to 23) of the day of a Date object according to universal time

(UTC)

Date

The milliseconds (an integer from 0 to 999) portion of a Date object according to local time Date

The milliseconds (an integer from 0 to 999) portion of a Date object according to universal

time (UTC)

Date

The minutes (an integer from 0 to 59) portion of a Date object according to local time Date

The minutes (an integer from 0 to 59) portion of a Date object according to universal time

(UTC)

Date

The month (0 for January, 1 for February, and so on) portion of a Date object according to

local time

Date

The month (0 [January] to 11 [December]) portion of a Date object according to universal

time (UTC)

Date

prototype : Object

[static] A reference to the prototype object of a class or function object Object

The seconds (an integer from 0 to 59) portion of a Date object according to local time Date

The seconds (an integer from 0 to 59) portion of a Date object according to universal time Date

(UTC)

The number of milliseconds since midnight January 1, 1970, universal time, for a Date

object

Date

[read-only] The difference, in minutes, between universal time (UTC) and the computer's

local time

Date Public Methods

Phương thức

Date(yearOrTimevalue:Object, month:Number, date:Number = 1, hour:Number = 0,

minute:Number = 0, second:Number = 0, millisecond:Number = 0)

Constructs a new Date object that holds the specified date and time

Date

Returns the day of the month (an integer from 1 to 31) specified by a Date object according

to local time

Date

Returns the day of the week (0 for Sunday, 1 for Monday, and so on) specified by this Date according to local time

Date

Returns the full year (a four-digit number, such as 2000) of a Date object according to local time

Date

Returns the hour (an integer from 0 to 23) of the day portion of a Date object according to

local time

Date

Returns the milliseconds (an integer from 0 to 999) portion of a Date object according to

local time

Date

Returns the minutes (an integer from 0 to 59) portion of a Date object according to local

time

Date

Returns the month (0 for January, 1 for February, and so on) portion of this Date according

to local time

Date

Returns the seconds (an integer from 0 to 59) portion of a Date object according to local

time

Date

Returns the number of milliseconds since midnight January 1, 1970, universal time, for a

Date object

Date

Returns the difference, in minutes, between universal time (UTC) and the computer's local time

Date

Returns the day of the month (an integer from 1 to 31) of a Date object, according to

universal time (UTC)

Returns the day of the week (0 for Sunday, 1 for Monday, and so on) of this Date according

to universal time (UTC)

Date

Returns the four-digit year of a Date object according to universal time (UTC) Date

Returns the hour (an integer from 0 to 23) of the day of a Date object according to universal time (UTC)

Date

Returns the milliseconds (an integer from 0 to 999) portion of a Date object according to

universal time (UTC)

Date

Returns the minutes (an integer from 0 to 59) portion of a Date object according to

universal time (UTC)

Date

Returns the month (0 [January] to 11 [December]) portion of a Date object according to

universal time (UTC)

Date

Returns the seconds (an integer from 0 to 59) portion of a Date object according to

universal time (UTC)

Date

Indicates whether an object has a specified property defined Object

Indicates whether an instance of the Object class is in the prototype chain of the object

specified as the parameter

Object

[static] Converts a string representing a date into a number equaling the number of

milliseconds elapsed since January 1, 1970, UTC

Date

Indicates whether the specified property exists and is enumerable Object

Sets the day of the month, according to local time, and returns the new time in milliseconds Date

Sets the year, according to local time, and returns the new time in milliseconds Date

Sets the hour, according to local time, and returns the new time in milliseconds Date

Sets the milliseconds, according to local time, and returns the new time in milliseconds Date

Sets the minutes, according to local time, and returns the new time in milliseconds Date

Sets the month and optionally the day of the month, according to local time, and returns the Date

new time in milliseconds

Sets the availability of a dynamic property for loop operations Object

Sets the seconds, according to local time, and returns the new time in milliseconds Date

Sets the date in milliseconds since midnight on January 1, 1970, and returns the new time in milliseconds

Date

Sets the day of the month, in universal time (UTC), and returns the new time in

milliseconds

Date

Sets the year, in universal time (UTC), and returns the new time in milliseconds Date

millisecond:Number):Number

Sets the hour, in universal time (UTC), and returns the new time in milliseconds

Date

Sets the milliseconds, in universal time (UTC), and returns the new time in milliseconds Date

Sets the minutes, in universal time (UTC), and returns the new time in milliseconds Date

Sets the month, and optionally the day, in universal time(UTC) and returns the new time in

milliseconds

Date

Sets the seconds, and optionally the milliseconds, in universal time (UTC) and returns the

new time in milliseconds

Date

Returns a string representation of the day and date only, and does not include the time or

timezone

Date

Returns a String representation of the day and date only, and does not include the time or

timezone

Date

toLocaleString():String

Returns a String representation of the day, date, time, given in local time Date

Returns a String representation of the time only, and does not include the day, date, year, or

timezone

Date

toString():String

Returns a String representation of the day, date, time, and timezone Date

Returns a String representation of the time and timezone only, and does not include the day

and date

Date

Returns a String representation of the day, date, and time in universal time (UTC) Date

UTC(year:Number, month:Number, date:Number = 1, hour:Number = 0, minute:Number =

0, second:Number = 0, millisecond:Number = 0):Number

[static] Returns the number of milliseconds between midnight on January 1, 1970, universal

time, and the time specified in the parameters

Date

Returns the number of milliseconds since midnight January 1, 1970, universal time, for a

Date object

Date

Ví dụ sau xuất ra ngày tháng tiếng Việt không dáu Muốn có dấu trong trang viết code ta thay ñổi kiểu gõ TCVN và font dạng VNI hổ trợ Unicode

var Thang:Array = new Array("Thang gieng","Thang Hai","Thang Ba", "Thang Tu","Thang Nam","Thang Sau",

"Thang Bay","Thang Tam","Thang Chin",

"Thang Muoi","Thang Muoi mot", "Thang Muoi Hai"); var Thungay:Array = new Array("Chu Nhat","Thu Hai","Thu Ba",

"Thu Tu","Thu Nam","Thu Sau","Thu Bay")

var now:Date = new Date();

trace(Thungay[now.getUTCDay()]+" ngay "+now.getUTCDate()

+" "+ Thang[now.getUTCMonth()]+" nam "+

now.getUTCFullYear());

Kết quả:

Thu Bay ngay 18 Thang Chin nam 2010

-

Ví dụ thêm và không thêm số 0 trong cách viết giờ phút:

var someday:Date = new Date(2010, 18, 09, 15, 5);

trace(someday);

trace(someday.getHours() + ":" + someday.getMinutes());

var gio_cua_may_ban:String = gio_kieu_USA(someday.getHours(), someday.getMinutes());

trace(gio_cua_may_ban);

function gio_kieu_USA(hrs:uint, mins:uint):String {

var sang_chieu:String = "PM";

var Phut:String = kieu_hai_so(mins);

if(hrs > 12) {

hrs = hrs-12;

} else if(hrs == 0) {

sang_chieu = "AM";

hrs = 12;

} else if(hrs < 12) {

sang_chieu = "AM";

}

return (kieu_hai_so(hrs) + ":" + Phut + " " + sang_chieu); }

function kieu_hai_so(num:uint):String {

if(num < 10) {

return ("0" + num);

}

return num.toString();

}

Kết quả:

Sat Jul 9 15:05:00 GMT+0700 2011 15:5

03:05 PM