如何使用Javascript检查/计算周日计数（使用Date函数）？ [英] How to check/calculate the week-day count (using Date functions) using Javascript?

问题描述

我想检查一个给定的日期是在日期的第一个，第二个，第三个，第四个还是最后一个星期一，星期二，星期三，...星期日。

I would like to check if a given date is the first, second, third, fourth or last monday, tuesday, wednesday,..., sunday in the dates month.

该函数应如下所示：

if(checkdate(date, "second", "monday"))
{
   alert("This is the second monday of the month");
}
else
{
   alert("This is NOT the second monday of the month");
}

推荐答案

我宁愿写一个函数它返回一个对象，告诉我给定日期的日期和周数。如下：

I would rather write a function that returns an object telling me the day and the week-number-in-month of the given date. Something like:

function infoDate(date) {
 return {
  day: date.getDay()+1,
  week: (date.getDate()-1)%7+1
 }
}

然后我可以读取返回的对象，找出是否是第二个星期一或者什么：

Then I can read the returned object and find out if it's the second monday or whatever:

var info = infoDate(date);
if(info.day==1 && info.week==2) {
  // second monday
}

当然，您仍然可以根据数字和日期名称数组来编写另一个本地化函数，完全符合您的要求。

Of course, you can still write another localized function that does exactly what you ask for based on an array of numeral and day names.

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