我有这个js代码。它有效，但我注意到我收到这样的错误。 “类型错误:document.getElementById(...) 为空” 我注意到 Firebug 中的错误不断计数。所以我假设是 for 循环继续进行。你能看一下下面的代码并告诉我它有什么问题吗？
<script>
$( document ).ready(function() {
//Create object with the list of due dates
//The 'name' will correspond to the field ID to populate the results
var dueDates = {
'date1':'2017-04-17 09:55:18',
'date2':'2017-05-17 09:55:18',
'date3':'2017-06-17 09:55:18'
};
var timer = setInterval(function() {
//Instantiate variables
var dueDate, distance, days, hours, minutes, seconds, output;
//Set flag to repeat function
var repeat = false;
// Get todays date and time
var now = new Date().getTime();
//Iterate through the due dates
for (var dueDateId in dueDates) {
//Get the due date for this record
dueDate = new Date(dueDates[dueDateId]);
// Find the distance between now an the due date
distance = dueDate - now;
// Time calculations for days, hours, minutes and seconds
days = Math.floor(distance / (1000 * 60 * 60 * 24));
hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
seconds = Math.floor((distance % (1000 * 60)) / 1000);
//Determine the output and populate the corresponding field
output = "OVERDUE";
if (distance > 0)
{
output = days + "d " + hours + "h " + minutes + "m " + seconds + "s";
repeat = true; //If any record is not expired, set flag to repeat
}
document.getElementById(dueDateId).innerHTML = output;
//If flag to repeat is false, clear event
if(!repeat)
{
clearInterval(timer);
}
}
}, 1000);
});
</script><div id="date1"></div>
<div id="date2"></div>
<div id="date3"></div>最佳答案
您的第一个到期日是 future ，因此距离为正，因此repeat在第一次迭代中设置为true循环。由于它在循环内永远不会再次变为 false，因此 clearInterval 函数不会在任何 for 循环迭代中执行。所以1秒后会再次调用setInterval回调，并且重复相同的逻辑...
关于javascript - 这段 JavaScript 代码有什么问题？一直循环不停，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43285395/