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我只是有一個關於我的代碼如下的問題。 if語句工作不正常，他們沒有正確測試月份。我相信問題在於不等於零件。使用腳本，這是問題似乎出現的地方。在這方面，我不是100％熟悉javascript語法。由於if語句中的多個「ors」和「ands」
<script = text/javascript>
function calculate(){
var year = parseInt(document.getElementById("year").value);
var month = parseInt(document.getElementById("month").value);
var day = parseInt(document.getElementById("day").value);
if ((month == 2 && day > 28) && (!(year == 2016) || (!(year == 2020))) && day > 28)
{
alert("Sorry. The day " + day + " is not available in the month of February in the year of " + year);
}
else if((month == 2 && day > 29) && ((year == 2016) || (year == 2020))){
alert("Sorry. The day " + day + " is not available in the month of February in the year of " + year);
}
else
{
newmonth = month + 9;
newday = day + 10;
//if the month is greater then 12 roll over the year and change the month
if ((newmonth > 12)){
year = year + 1;
newmonth = newmonth - 12;
}
//if the day equals January and has a day grater than 31 then roll over to the next month
if ((newday > 31) && (newmonth == 1)){
newmonth = newmonth + 1;
newday = newday - 31;
}
//if the day equals February and has a day grater than 28 on a non leap year then roll over to the next month
if ((newday > 28) && (newmonth == 2) && (year == 2014)){
newmonth = newmonth + 1;
newday = newday - 28;
}
//if the day equals February and has a day grater than 29 then roll over to the next month
if ((newday > 29) && (newmonth == 2) && (year == 2016)){
newmonth = newmonth + 1;
newday = newday - 29;
}
//if the day equals February and has a day grater than 29 then roll over to the next month
if ((newday > 29) && (newmonth == 2) && (year == 2020)){
newmonth = newmonth + 1;
newday = newday - 29;
}
//if the day equals February and has a day grater than 29 then roll over to the next month
if ((newday > 29) && (newmonth == 2) && (year == 2024)){
newmonth = newmonth + 1;
newday = newday - 29;
}
//if the day equals February and has a day grater than 29 then roll over to the next month
if ((newday > 29) && (newmonth == 2) && (year == 2028)){
newmonth = newmonth + 1;
newday = newday - 29;
}
//if the day equals March and has a day grater than 31 then roll over to the next month
if ((newday > 31) && (newmonth == 3)){
newmonth = newmonth + 1;
newday = newday - 31;
}
//if the day equals April and has a day grater than 30 then roll over to the next month
if ((newday > 30) && (newmonth == 4)){
newmonth = newmonth + 1;
newday = newday - 30;
}
//if the day equals May and has a day grater than 31 then roll over to the next month
if ((newday > 31) && (newmonth == 5)){
newmonth = newmonth + 1;
newday = newday - 31;
}
//if the day equals June and has a day grater than 30 then roll over to the next month
if ((newday > 30) && (newmonth == 6)){
newmonth = newmonth + 1;
newday = newday - 30;
}
//if the day equals July and has a day grater than 31 then roll over to the next month
if ((newday > 31) && (newmonth == 7)){
newmonth = newmonth + 1;
newday = newday - 31;
}
//if the day equals March and has a day grater than 31 then roll over to the next month
if ((newday > 31) && (newmonth == 8)){
newmonth = newmonth + 1;
newday = newday - 31;
}
//if the day equals September and has a day grater than 30 then roll over to the next month
if ((newday > 30) && (newmonth == 9)){
newmonth = newmonth + 1;
newday = newday - 30;
}
//if the day equals October and has a day grater than 31 then roll over to the next month
if ((newday > 31) && (newmonth == 10)){
newmonth = newmonth + 1;
newday = newday - 31;
}
//if the day equals November and has a day grater than 30 then roll over to the next month
if ((newday > 30) && (newmonth == 11)){
newmonth = newmonth + 1;
newday = newday - 30;
}
//if the day equals December and has a day grater than 31 then roll over to the next month
if ((newday > 31) && (newmonth == 12)){
newmonth = 1;
newday = newday - 31;
}
alert("Your cow is due to calve on:"+" Day "+newday+" Month "+newmonth+" Year "+year);
}
}
99％的時候，我指責一個'如果'我的代碼不正確的工作，原來是我的錯。只是說:) –
JavaScript有一個'Date'對象。你應該使用它而不是編寫這麼多的代碼。請參閱https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date。 –