JS实现简单日历

/*
    //api
    num : year
    num : month
    num : date
    num : day
    num : time
    data: getData()
    data: preMonth()
    data: nextMonth()
    data: preYear()
    data: nextYear()
    data: thisMonth()
    data: costomDate()
    data{isToday,isThisMonth,date}

*/

function Calendar(studyWeek){
    var calendar = new Object();
    //日期数据基础
    calendar.baseDate = new Date();
    //初始化
    calendar.init = function (){
        this.year = this.baseDate.getFullYear();
        this.month = this.baseDate.getMonth();
        this.date = this.baseDate.getDate();
        this.day = this.baseDate.getDay();
        this.time = this.baseDate.getTime();
    }
    calendar.init();

    //获取数据
    calendar.getData = function (){
        var data = [];
        //起始值
        var date = new Date(this.year,this.month,1);
        date.setTime(date.getTime() - 86400000 * date.getDay());

        do{
            for(var i=0; i<7; i++){
                var obj = {};
                obj.isThisMonth = date.getMonth() == this.month? true : false;
                obj.isToday = date.getDate() == this.date && date.getMonth() == new Date().getMonth() ? true : false;
                obj.isWeek = i == 0 || i == 6? true : false;
                obj.date = date.getDate();
                obj.month = date.getMonth() + 1;
                obj.year = date.getFullYear();
                obj.weekNum = this.setWeekNum(obj);
                data.push(obj);
                date.setTime(date.getTime() + 86400000);
            }
        } while(date.getMonth() == this.month);

        return data;
    }
    //设置周次
    calendar.setWeekNum = function(obj){
        var study = new Date(studyWeek.year, studyWeek.month, studyWeek.date).getTime();
        var now = new Date(obj.year, obj.month, obj.date).getTime();
        var weekNum = Math.ceil( (now - study) / (1000 * 60 * 60 * 24) / 7 );
        return weekNum + 1;
    }
    //上月
    calendar.preMonth = function (){
        this.month--;
        this.baseDate.setMonth(this.month);
        this.init();

        return this.getData();
    }
    //下月
    calendar.nextMonth = function (){
        this.month++;
        this.baseDate.setMonth(this.month);
        this.init();

        return this.getData();
    }
    //上一年
    calendar.preYear = function (){
        this.year -= 1;
        this.baseDate.setFullYear(this.year);
        this.init();

        return this.getData();
    }
    //下一年
    calendar.nextYear = function (){
        this.year += 1;
        this.baseDate.setFullYear(this.year);
        this.init();

        return this.getData();
    }
    //本月
    calendar.thisMonth = function (){
        this.baseDate = new Date();
        this.init();
        return this.getData();
    }
    //自定义年月
    calendar.customDate = function (year,month){
        this.year = +year;
        this.month = +month;
        this.baseDate.setFullYear(this.year);
        this.baseDate.setMonth(this.month - 1);
        this.init();
        return this.getData();
    }
    //返回值
    return calendar;

}

var calendar = new Calendar();
 var data = calendar.getData();