我试图让 this countdown 在我的本地工作，但在浏览器中查看它时不断收到此错误。
未捕获的类型错误：无法读取 null 的属性（读取“querySelector”）
我尝试将脚本标签移动到 html 文件的底部并确认 CSS 选择器。
非常感谢任何帮助。
This is a screenshot of the error in Chrome
scripts.js
function getTimeRemaining(endtime) {
var t = Date.parse(endtime) - Date.parse(new Date());
var seconds = Math.floor((t / 1000) % 60);
var minutes = Math.floor((t / 1000 / 60) % 60);
var hours = Math.floor((t / (1000 * 60 * 60)) % 24);
var days = Math.floor(t / (1000 * 60 * 60 * 24));
return {
total: t,
days: days,
hours: hours,
minutes: minutes,
seconds: seconds
};
}
function initializeClock(id, endtime) {
var clock = document.getElementById(id);
var daysSpan = clock.querySelector(".days")
var hoursSpan = clock.querySelector(".hours");
var minutesSpan = clock.querySelector(".minutes");
var secondsSpan = clock.querySelector(".seconds");
function updateClock() {
var t = getTimeRemaining(endtime);
if (t.total <= 0) {
clearInterval(timeinterval);
var newTime = Date.parse(endtime);
var nowTime = Date.parse(new Date());
while (newTime <= nowTime) {
newTime = newTime + 1 * 24 * 60 * 60 * 1000; // add 24hours
}
var deadline = new Date(newTime);
initializeClock('countdown', deadline);
} else {
daysSpan.innerHTML = t.days;
hoursSpan.innerHTML = ("0" + t.hours).slice(-2);
minutesSpan.innerHTML = ("0" + t.minutes).slice(-2);
secondsSpan.innerHTML = ("0" + t.seconds).slice(-2);
}
}
updateClock();
var timeinterval = setInterval(updateClock, 1000);
}
var deadline = "December 31 2030 16:00:00 GMT+1100";
initializeClock("countdown", deadline);
index.html
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<script src="scripts.js"></script>
<div id="countdown-parent"><h5 class="countdown-title">Order before 4pm for same day delivery</h5>
<div id="countdown" class="countdown">
<div class="countdown-number">
<span class="days"></span>
<span class="countdown-text">Days</span>
</div>
<div class="countdown-number">
<span class="hours countdown-time"></span>
<span class="countdown-text">Hours</span>
</div>
<div class="countdown-number">
<span class="minutes countdown-time"></span>
<span class="countdown-text">Minutes</span>
</div>
<div class="countdown-number">
<span class="seconds countdown-time"></span>
<span class="countdown-text">Seconds</span>
</div>
</div>
</div>
</body>
</html>
