如何在 Javascript 中循环使用几个月
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How to loop through months in Javascript
提问by BoVut
I'm trying to generate a list of string dates in months (i.e. ["Oct 2014", "Nov 2014",... "Jan 2015" ]) using the code here:
我正在尝试使用此处的代码生成以月为单位的字符串日期列表（即 ["Oct 2014", "Nov 2014",... "Jan 2015" ]）：
var resultList = [];
var date = new Date("October 13, 2014");
var endDate = new Date("January 13, 2015");
var monthNameList = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
while (date <= endDate)
{
var stringDate = monthNameList[date.getMonth()] + " " + date.getFullYear();
resultList.push(stringDate);
date.setDate(date.getMonth() + 1);
}
return resultList;
But when I run the code, the screen was frozen (like it was endless loop or something). I never have this problem when I generate daily date (i.e. date.getDate() +1 ). Am I missing something here?
但是当我运行代码时，屏幕被冻结（就像它是无限循环或其他东西）。当我生成每日日期（即 date.getDate() +1 ）时，我从来没有遇到过这个问题。我在这里错过了什么吗？
采纳答案by Anthony Forloney
The problem is within your date.setDate(date.getMonth() + 1)code as the MDN documentation states the setDatefunction sets the dayto the specified Dateobject. Therefore, it's not behaving as you had intended.
问题出在您的date.setDate(date.getMonth() + 1)代码中，因为 MDN 文档指出该setDate函数将日期设置为指定的Date对象。因此，它的行为不符合您的预期。
To better illustrate the problem, the datevariable is initialized as Mon Oct 13 2014 00:00:00 GMT-0400 (Eastern Daylight Time). When you call date.getMonth()it returns 9indicating the 10th month in the calendar year; so incrementing the value by 1 results in setting the dayof the datevariable to 10.
为了更好地说明问题，date变量被初始化为Mon Oct 13 2014 00:00:00 GMT-0400 (Eastern Daylight Time)。当您调用date.getMonth()它时，它会返回9指示日历年的第 10 个月；因此将值增加 1 会导致将变量的日期设置date为10。
On the next iteration, the monthhasn't changed, so the code re-executes date.getMonth()which returns 9again, so on and so on.
This unexpected behavior continues to repeat endlessly as the whilecondition is never satisfied.
在下一次迭代中，月份没有改变，所以代码重新执行date.getMonth()，9然后再次返回，依此类推。由于while条件永远不会满足，这种意外行为会继续无休止地重复。
The code should be updated to use setMonthinstead.
应更新代码以改为使用setMonth。
回答by frosdqy
Use setMonth()instead of setDate()to sets the month of the date variable.
使用setMonth()代替setDate()来设置日期变量的月份。
date.setMonth(date.getMonth() + 1);
