===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);
}
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