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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： 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]; } 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]; } 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); } (责任编辑：admin) |