时间对象的封装

<script type="text/javascript">   
 
    //时间对象封装
    function myDate2(date){
        this.date = new Date(date);
        this.Y = function(){
            return this.date.getFullYear();
        }
        this.m = function(){
            var m = (this.date.getMonth()+1).toString();
            if(m.length==1) return "0"+m;
            return m;
        }
        this.d = function(){
            var d = this.date.getDate().toString();
            if(d.length==1) return "0"+d;
            return d;
        }
    }
 
    //时间对象格式化
    myDate2.prototype.Format = function(format){
        if(format=="yyyy"){
            return this.Y();
        }else if(format=="yyyy-mm"){
            return this.Y()+"-"+this.m();
        }else if(format=="yyyy-mm-dd"){
            return this.Y()+"-"+this.m()+"-"+this.d();
        }
        throw new error("非法的格式");
    }
 
    //时间对象加减
    myDate2.prototype.AddDate = function(Y,m,d){
        this.date.setFullYear(parseInt(this.Y())+Y);
        this.date.setMonth(parseInt(this.m())+m-1);
        this.date.setDate(parseInt(this.d())+d);
        return this;
    }
 
    //工厂
    function myDate(date){
        return new myDate2(date);
    }
 
    //举个栗子
    var d = myDate("2016-02-14");//将字符串时间实例化myDate2对象
    d.AddDate(0,0,10);//加10天
    console.log(d.Format("yyyy-mm-dd"));//格式化输出2016-02-24
</script>