Cela montre le tutoriel JavaScript algorithme de faire un compte à rebours simple sur vos pages web, seulement avec un petit nombre de lignes de code.
- Demo
- Agrandir
- Recharger
- New window
Gratuit iPage h�bergement Web pour la premi�re ann�e MOMENT
Si vous �tes toujours � la recherche d'un fournisseur d'h�bergement Web fiable avec des tarifs abordables, pourquoi vous ne prenez pas un peu de temps pour essayer iPage, seulement avec $1.89/month, inclus $500+ Cr�dits suppl�mentaires gratuites pour le paiement de 24 mois ($45)?
Plus de 1.000.000 de clients + existisng peuvent pas avoir tort, vraiment vous n'�tes pas aussi! Plus important encore, lorsque vous enregistrez l'h�bergement web � iPage gr�ce � notre lien, nous allons �tre heureux de renvoyer un plein remboursement. C'est g�nial! Vous devriez essayer iPage h�bergement web GRATUITEMENT maintenant! Et contactez-nous pour tout ce que vous devez savoir sur iPage.
Dave, being a new web developer I would like to know how I can code for a numeric value to decrease by 1 every 24 hours based on the local time function.
Specifically, we are trying to create a reminder for our employees of an upcoming DoD audit in the facility. The count down will represent the number of days remaining before it's conducted. So what I need to do is begin with a date and start the countdown from there. What is the code that I should use?
Dave's Answer:This is an obvious situation where JavaScript is going to be your friend, and it turns out that this is a straightforward application of JavaScript so it should be fairly easy.
The key is to realize that JavaScript is a so-called object oriented programming language and that it has a specific date object with "methods" that let you set and extract specific values. But, really, this task is even easier than that, because all we need to do is set a specific target date in the future, get the current date, then calculate the amount of time between them and divide it out so that we end up with days as the value.
You get the current date in JavaScript with new Date(), and it turns out that if you specify a date in the parens, it instantiates (creates) a new object with the specified date, rather than today. Want to have a date object with 28 February, 2005 as the specified date? Use new Date("28 February, 2005") and it'll work just fine.
Then we want to work with what us Unix types call the "epoch time" which is the number of milliseconds since a fixed point in the past. For convenience, it's 1 Jan, 1970 on most systems, but if you think about it you'll realize that it doesn't matter what date the epoch time starts with, as long as it's consistent across both values. Anyway, let's see some code!
<script language="javascript" type="text/javascript"> today = new Date(); todayEpoch = today.getTime(); target = new Date("28 February, 2005"); targetEpoch = target.getTime(); daysLeft = Math.floor(((targetEpoch - todayEpoch) / (60*60*24)) / 1000); </script>
This JavaScript code snippet, which I'd put in the HEAD of my document, calculates the number of days left until the target date and saves it in the variable daysLeft. Notice that since we're actually working in milliseconds and we want days, we need to divide by 1000 to get seconds, then divide by 60 (to get minutes), 60 again (to get hours) and then 24 (to get days). Finally, we use the mathematical floor function to make sure we don't get weird values like 23.434233 days or similar, as a convenience.
Whenever you want to actually include that value on the page, simply add a single line of JavaScript within the HTML code:
<script>document.write(daysLeft);</script>
To put it all together, here's a simple little page that has both JavaScript code pieces displayed:
<html> <head> <title>JavaScript Countdown timer test</title> <script language="javascript" type="text/javascript"> today = new Date(); todayEpoch = today.getTime(); target = new Date("28 February, 2005"); targetEpoch = target.getTime(); daysLeft = Math.floor(((targetEpoch - todayEpoch) / (60*60*24)) / 1000); </script> </head> <body> <h1>DoD inspection in <script>document.write(daysLeft);</script> days. Are you ready? </h1> </body>
I hope that'll help you create what you need on your site, and good luck with your DoD inspection too!
- Sent (0)
- Nouveau
Save up to 630$ when buy new iPhone 15
GateIO.gomymobi.com
Free Airdrops to Claim, Share Up to $150,000 per Project
https://tooly.win
Open tool hub for free to use by any one for every one with hundreds of tools
chatGPTaz.com, chatGPT4.win, chatGPT2.fun, re-chatGPT.com
Talk to ChatGPT by your mother language
Dall-E-OpenAI.com
Generate creative images automatically with AI
AIVideo-App.com
Render creative video automatically with AI
Đồng hồ đếm thời gian ngược R�ponse
Bạn ơi, bạn cho mình hỏi là với code như bạn tạo trên thì chỉ tạo được 1 bộ đếm thời gian, vậy giờ mình muốn tạo nhiều hơn 1 bộ đếm thời gian thì pải làm thế nào?
Xin cảm ơn bạn nhiều.
khai báo thành hàm đó bạn R�ponse
Code:
cách sử dụng như sau:
Code:
R�ponse