我有一个脚本，我在其中尝试进行倒计时，倒计时 30 天，然后重置为 30 天并重新开始。但我的问题是，当我在我的浏览器 (safari) 中打开它时，页面是空白的，上面没有任何内容，尽管如果我删除我用来重置倒计时的功能，它可以工作，但我需要它重置。
if (seconds_left <= 0){
target_date = target_date + 30 days;
}
完整代码:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<span id="countdown"></span>
<script LANGUAGE="Javascript">
var target_date = new Date("Apr 9, 2015").getTime();
var days, hours, minutes, seconds;
var countdown = document.getElementById("countdown");
if (seconds_left <= 0){
target_date = target_date + 30 days;
}
setInterval(function () {
var current_date = new Date().getTime();
var seconds_left = (target_date - current_date) / 1000;
days = parseInt(seconds_left / 86400);
seconds_left = seconds_left % 86400;
hours = parseInt(seconds_left / 3600);
seconds_left = seconds_left % 3600;
minutes = parseInt(seconds_left / 60);
seconds = parseInt(seconds_left % 60);
countdown.innerHTML = days + "d, " + hours + "h, "
+ minutes + "m, " + seconds + "s";
}, 1000);
</script>
</body>
</html>
最佳答案
<!DOCTYPE html>
<html>
<head></head>
<body>
<span id="countdown"></span>
<script type="text/javascript">
var target_date = new Date("Apr 9, 2015").getTime();
var days, hours, minutes, seconds;
var countdown = document.getElementById("countdown");
setInterval(function () {
var current_date = new Date().getTime();
var seconds_left = (target_date - current_date) / 1000;
//the following two lines are moved inside the function
if (seconds_left <= 0)
{
target_date = target_date + 30; //just 30 would suffice to add 30 days
seconds_left = (target_date - current_date) / 1000; //then update the seconds_left to continue
}
days = parseInt(seconds_left / 86400);
seconds_left = seconds_left % 86400;
hours = parseInt(seconds_left / 3600);
seconds_left = seconds_left % 3600;
minutes = parseInt(seconds_left / 60);
seconds = parseInt(seconds_left % 60);
countdown.innerHTML = days + "d, " + hours + "h, "
+ minutes + "m, " + seconds + "s";
}, 1000);
</script>
</body>
</html>
关于javascript - 倒计时不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28974654/