getDays()函数接收哪月值和哪年值，并且建立一个有12个元素的数组，用来存放每月的天数，哪一年用来决定是不是闰年，在闰年中二月是29天，而不是闰年是28天。该函数返回指定月份的天数。

以下是getDays()：

function getDays(month, year) {
// create array to hold number of days in each month
var ar = new Array(12);
ar[0] = 31; // January
ar = (leapYear(year)) ? 29 : 28; // February
ar = 31; // March
ar = 30; // April
ar = 31; // May
ar = 30; // June
ar = 31; // July
ar = 31; // August
ar = 30; // September
ar = 31; // October
ar = 30; // November
ar = 31; // December

// return number of days in the specified month (parameter)
return ar[month];
}

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