问题描述

我正在开发一个有两个背靠背网络广播的网站.我使用 PHP 来显示应该启用和禁用按钮的时间.现在我需要使用Javascript在第一次广播之前，第二次广播之前和第二次广播之后自动刷新页面.我实现了以下脚本，它确实在给定时间刷新了页面，但是，它并不能完全按照我的需要工作.我需要更改脚本，使其仅在美国东部标准时间周日晚上 7:45、晚上 8 点和晚上 8:30 刷新页面.

I am developing a website that has two back to back web broadcasts. I have used PHP to display the time that the buttons should be enabled and disabled. Now I need to use Javascript to automatically refresh the page before the first broadcast, before the second broadcast and after the second broadcast. I implemented the following script and it does refresh the page at the given time, however, it doesn't work exactly as I need it to. I need to alter the script so that it refreshes the page on Sundays at 7:45pm, 8pm and 8:30pm EST only.

我正在使用修改后的脚本 从这个回答的问题

I'm using a modified script from this answered question

function refreshAt(hours, minutes, seconds) {
var now = new Date();
var then = new Date();

if(now.getUTCHours() > hours ||
   (now.getUTCHours() == hours && now.getUTCMinutes() > minutes) ||
    now.getUTCHours() == hours && now.getUTCMinutes() == minutes && now.getUTCSeconds() >= seconds) {
    then.setUTCDate(now.getUTCDate() + 1);
}
then.setUTCHours(hours);
then.setUTCMinutes(minutes);
then.setUTCSeconds(seconds);

var timeout = (then.getTime() - now.getTime());
setTimeout(function() { window.location.reload(true); }, timeout);
}

然后我调用 refreshAt() 函数.

Then I call the refreshAt() function.

refreshAt(19,45,0); //Will refresh the page at 7:45pm
refreshAt(20,00,0); //Will refresh the page at 8:00pm
refreshAt(20,30,0); //Will refresh the page at 8:30pm

我感到困惑的是如何更改此脚本以仅在周日为 EST 实现刷新.

Where I get confused is how to alter this script to only implement the refresh for EST on Sundays.

推荐答案

我想通了.这是脚本:

function refreshAt(hours, minutes, seconds, day) {
    var now = new Date();
    var then = new Date();
    var dayUTC = new Date();

    if(dayUTC.getUTCDay() == day) {

        if(now.getUTCHours() > hours ||
       (now.getUTCHours() == hours && now.getUTCMinutes() > minutes) ||
        now.getUTCHours() == hours && now.getUTCMinutes() == minutes && now.getUTCSeconds() >= seconds) {
        then.setUTCDate(now.getUTCDate() + 1);
        }

    then.setUTCHours(hours);
    then.setUTCMinutes(minutes);
    then.setUTCSeconds(seconds);


    var timeout = (then.getTime() - now.getTime());
    setTimeout(function() { window.location.reload(true); }, timeout);
    }
}

然后我只调用 refreshAt() 函数:

And then I just call the refreshAt() function:

 refreshAt(20,00,0,1); //Will refresh the page at 8:00pm on Monday UTC or 3:00pm EST

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