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我想表現出我的分機的下拉列表中選擇倒計時,但我有兩個問題:在瀏覽器擴展程序下拉顯示倒計時
A)我的腳本返回一個錯誤,因爲它無法通過編號從一開始元素下拉內容
B)即使關閉下拉並重新打開它,我如何保持倒計時運行?
這裏是我的JS:
// variables for time units
var days, hours, minutes, seconds;
// get tag element
var countdown = document.getElementById("countdown");
// update the tag with id "countdown" every 1 second
setInterval(function() {
// find the amount of "seconds" between now and target
var current_date = new Date().getTime();
var seconds_left = (target_date - current_date)/1000;
// do some time calculations
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);
// format countdown string + set tag value
countdown.innerHTML = days + "d, " + hours + "h, "
+ minutes + "m, " + seconds + "s";
}, 1000);
而在HTML我有:
<span id="countdown"></div>
我得到的錯誤是: 遺漏的類型錯誤:無法設置爲null的特性 '的innerHTML'
任何幫助真的很感激!謝謝 !!
謝謝德米特里!在A)的情況下,我在元素被加載後將腳本放置在體內,這解決了問題。但我懷疑你的建議是一樣的好。關於B)我會試一試,看看它是否有效。感謝您一直以來的幫助! –