===编写日历一===

　　当calendar.html调用 MYCAL:CALENDAR,当月的日历将会显示在页面中，函数setCal()是主要程序段，它初始化一些变量并调用drawCal()函数。我们也使用了三个别的函数：getMonthName()、 getDays() 和 leapYear()。让我们从最后一个函数开始：

// 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];
}