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[英]How to switch from one screen to another after a certain time in ReactJS?
[英]Switch from days to hours after a certain time
目標:一旦時間達到兩天或更短,就會切換到小時而不是幾天。
問題:在通過更改日期檢查代碼時,它仍然只顯示剩余的天數,而不顯示小時數。 我錯過了什么嗎?
var countDownDate = new Date("Nov 15, 2020 11:59:59").getTime();
var x = setInterval(function() {
var now = new Date().getTime();
var distance = countDownDate - now;
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
if (distance < 2) {
clearInterval(x);
document.getElementById("aep-countdown-date").innerHTML = hours + " hours left";
}
else if (distance < 0) {
clearInterval(x);
document.getElementById("aep-countdown-date").innerHTML = "The time has ended.";
}
else {
clearInterval(x);
document.getElementById("aep-countdown-date").innerHTML = days + " days left";
}
});
Date 方法getTime
返回:
自 Unix 紀元以來的毫秒數*。
您的代碼countDownDate - now
返回從現在到目標日期的毫秒數。
但是,您的比較distance < 2
將distance
(以毫秒為單位)視為以天為單位。
你可能想要
ms in seconds ------------------+
seconds in hour ---------+ |
hours in day ------+ | |
days -+ | | |
| | | |
if (distance < 2 * 24 * 3600 * 1000) {
/* ... */
}
在前兩個回答的幫助下,我想通了。 我在 hours 變量中添加了“2x”,並將 if 語句中的變量更改為 days 並去掉了 setInterval,因為它不需要(我只需要幾天和幾小時,而不是毫秒,並且它會不斷觸發):
var countDownDate = new Date("Nov 15, 2020 11:59:59").getTime();
$(function() {
var now = new Date().getTime();
var distance = countDownDate - now;
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor(
(2 * (distance % (1000 * 60 * 60 * 24))) / (1000 * 60 * 60)
);
document.getElementById("aep-countdown-date").innerHTML =
days + " days left.";
if (days < 0) {
document.getElementById("aep-countdown-date").innerHTML = "Time has ended.";
}
if (days < 2) {
document.getElementById("aep-countdown-date").innerHTML =
hours + " hours left.";
}
});
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