===编写日历一===
当calendar.html调用 MYCALCALENDAR,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:
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[1] = (leapYear(year)) 29 28; February ar[2] = 31; March ar[3] = 30; April ar[4] = 31; May ar[5] = 30; June ar[6] = 31; July ar[7] = 31; August ar[8] = 30; September ar[9] = 31; October ar[10] = 30; November ar[11] = 31; December
return number of days in the specified month (parameter) return ar[month]; }
===编写日历一===
如果指定的年数可以被4整除,那么leapYear()函数将返回“true”,否则返回”false“:
function leapYear(year) { if (year % 4 == 0) basic rule return true; is leap year else else not needed when statement is return return false; is not leap year } getMonthName()函数返回指定月份的名字: function getMonthName(month) { create array to hold name of each month var ar = new Array(12); ar[0] = January; ar[1] = February; ar[2] = March; ar[3] = April; ar[4] = May; ar[5] = June; ar[6] = July; ar[7] = August; ar[8] = September; ar[9] = October; ar[10] = November; ar[11] = December;
return name of specified month (parameter) return ar[month]; }
===编写日历一===
setCal()函数是主模块,我们在脚本的第一行调用它。该函数为当天(now)、和每月的第一天(firstDayInstance)建立一个Date对象。用这些对象,setCal()函数解析出关于一个月的第一天、当日,和最后一天的所有信息。
function setCal() { standard time attributes var now = new Date(); var year = now.getFullYear(); var month = now.getMonth(); var monthName = getMonthName(month); var date = now.getDate(); now = null;
create instance of first day of month, and extract the day on which it occurs var firstDayInstance = new Date(year, month, 1); var firstDay = firstDayInstance.getDay(); firstDayInstance = null;
number of days in current month var days = getDays(month, year);
call function to draw calendar drawCal(firstDay + 1, days, date, monthName, year); } 作者:feiy
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