嗨，我是Javascript的新手，所以请求naff问题道歉。这条代码返回一个Nan，它应该检索过去的天数。导致问题的第二个功能是什么？
这里是：
<body>
<script>
function elapsedTime(date1, date2) {
var start = new Date(date1);
var startMilli = start.getTime();
var end = new Date(date2);
var endMilli = end.getTime();
var elapsed = (endMilli - startMilli);
alert(millisToDaysHoursMinutes(elapsed));
}
function millisToDaysHoursMinutes(millis) {
var seconds = millis / 1000;
var totalMinutes = seconds / 60;
var minutesPerDay = 60 * 24;
var days = totalMinutes / minutesPerDay;
return days;
}
</script>
<form>
Start:<input type="text" name="date1" value="dd/m/year" /><br>
End: <input type="text" name="date2" value="dd/m/year" />
<input type="button" name="button1" onclick="elapsedTime(date1.value, date2.value)" value="Get Elapsed Time" />
</form>
</body>
您需要确保输入的日期有效，否则您将获得NaN（非数字）。使用input type=date并使它们成为required然后你可以在调用日期差异功能之前轻松检查它们是否有效。
例如：
function elapsedTime(date1, date2) {
var start = new Date(date1);
var startMilli = start.getTime();
var end = new Date(date2);
var endMilli = end.getTime();
var elapsed = (endMilli - startMilli);
alert(millisToDaysHoursMinutes(elapsed));
}
function millisToDaysHoursMinutes(millis) {
var seconds = millis / 1000;
var totalMinutes = seconds / 60;
var minutesPerDay = 60 * 24;
var days = totalMinutes / minutesPerDay;
return days;
}
var date1 = document.querySelector("input[name=date1]"),
date2 = document.querySelector("input[name=date2]"),
button1 = document.querySelector("input[name=button1]");
button1.addEventListener("click", function() {
var date1valid = date1.checkValidity();
var date2valid = date2.checkValidity();
if (date1valid && date2valid) {
elapsedTime(date1.value, date2.value);
} else {
alert("Please provide both dates!");
}
});<form>
Start:<input type="date" name="date1" required="required" value="dd/m/year" /><br> End: <input type="date" name="date2" required="required" value="dd/m/year" />
<input type="button" name="button1" value="Get Elapsed Time" />
</form>您应该使用输入类型date来使您的代码工作：
<form>
Start:<input type="date" name="date1" /><br>
End: <input type="date" name="date2" />
<input type="button" name="button1" onclick="elapsedTime(date1.value, date2.value)" value="Get Elapsed Time" />
</form>