在一天中的特定时间调用 javascript 函数
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Call a javascript function at a specific time of day
提问by ramazan murat
for example i want to call a js function at 10.00.00.00 am how can i do?
例如，我想在上午 10.00.00.00 调用一个 js 函数，我该怎么办？
<script type="text/javascript">
var now = new Date();
var millisTill10 = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 0, 30, 0, 0) - now;
setTimeout(function{openAPage(), setInterval(openAPage, 60*1000)}, millisTill10)
function openAPage() {
var startTime = new Date().getTime();
var myWin = window.open("http://google.com","_blank")
var endTime = new Date().getTime();
var timeTaken = endTime-startTime;
document.write("<br>button pressed@</br>")
document.write(new Date(startTime));
document.write("<br>page loaded@</br>")
document.write(new Date(endTime));
document.write("<br>time taken</br>")
document.write(timeTaken);
myWin.close()
}
</script>
i expect from this code at 00.30 it will open google and then every 1 minute later it will do it again? whats wrong with that code?
我希望从这个代码在 00.30 开始它会打开谷歌，然后每 1 分钟后它会再做一次？那个代码有什么问题？
回答by Chris Morgan
You'll need setTimeoutto set a timer and Dateto calculate how long the timer needs to go until it triggers.
您需要setTimeout来设置计时器和Date来计算计时器需要多长时间才能触发。
var now = new Date();
var millisTill10 = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 10, 0, 0, 0) - now;
if (millisTill10 < 0) {
millisTill10 += 86400000; // it's after 10am, try 10am tomorrow.
}
setTimeout(function(){alert("It's 10am!")}, millisTill10);
回答by Harijs Krūtainis
My solution for running a script at a specific time, btw no error checking for negative timeout.
我在特定时间运行脚本的解决方案，顺便说一句，没有错误检查负超时。
//year, month 0-11, date, hour, min (can add ,sec,msec)
var eta_ms = new Date(2015, 0, 21, 17, 0).getTime() - Date.now();
var timeout = setTimeout(function(){}, eta_ms);
回答by KeithS
Assuming the code is located on a web page that will be loaded before 10:00 and will still be viewed at 10:00, you can use setTimeout()to set up a timed event. the function takes some JS statement to execute, and the number of milliseconds before it should execute. You can find this second part pretty easily with the built-in date functions.
假设代码位于将在 10:00 之前加载并且仍会在 10:00 被查看的网页上，您可以使用setTimeout()来设置定时事件。该函数需要一些 JS 语句来执行，以及它应该执行之前的毫秒数。您可以使用内置的日期函数轻松找到第二部分。
