tinydate.js[v0.2] 优化了调用方式

存在的问题
调用方式过于繁琐，部分函数需要实例化后才能调用，这个与便利的初衷不符合，所以做出如下调整。
tinydate.js v0.2

Date.prototype.format = function (fmt) {
    var o = {
        "M+": this.getMonth() + 1,                 //月份 
        "d+": this.getDate(),                    //日 
        "H+": this.getHours(),                   //小时 
        "m+": this.getMinutes(),                 //分 
        "s+": this.getSeconds(),                 //秒 
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
        "f+": this.getMilliseconds()             //毫秒 
    };
    if (/(y+)/.test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    }
    for (var k in o) {
        if (new RegExp("(" + k + ")").test(fmt)) {
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        }
    }
    return fmt;
}
//当前完整时间
Date.$nowDate = new Date().format("yyyy-MM-dd HH:mm:ss.ffff");
//获取自定义格式的当前时间
Date.$now = function (fmt) {
    return new Date().format(fmt);
}
//计算时间差
Date.diff = function (sDate, eDate) {
    if (eDate == undefined || eDate == null)
        eDate = new Date();
    var stime = sDate.getTime();
    var etime = eDate.getTime();

    var diffTime = etime - stime;

    var timeSpan = new TimeSpan(diffTime);
    return timeSpan;
}
//添加年
Date.prototype.addYear = function (number) {
    this.setFullYear(this.getFullYear() + number);
}
//添加月
Date.prototype.addMonth = function (number){
    this.setMonth(this.getMonth()+number);
}
//添加日
Date.prototype.addDate = function (number){
    this.setDate(this.getDate()+number);
}
//添加小时
Date.prototype.addHours = function (number){
    this.setHours(this.getHours()+number);
}
//添加分
Date.prototype.addMinutes = function (number){
    this.setMinutes(this.getMinutes()+number);
}
//添加秒
Date.prototype.addSeconds = function (number){
    this.setSeconds(this.getSeconds()+number);
}
//添加毫秒
Date.prototype.addMilliseconds = function (number){
    this.setMilliseconds(this.getMilliseconds()+number);
}

//获得一年中第一天的日期
Date.prototype.getTheFirstDateOfTheYear = function (date) {
    var year, month=0, day=1;
    if (date == undefined || date == null) {
        year = this.getFullYear();
    }
    else {
        year = date.getFullYear();
    }

    return new Date(year, month, day);
}
//获得一年中最后一天的日期
Date.prototype.getTheLastDateOfTheYear = function (date) {
    var year, month = 11, day = 31;
    if (date == undefined || date == null) {
        year = this.getFullYear();
    }
    else {
        year = date.getFullYear();
    }

    return new Date(year, month, day);
}
//格式化当前日期 为 时限对象
Date.prototype.timeSpan = function () {
    return new TimeSpan(this);
}
//时限对象
function TimeSpan() {
    var o = new Object();
    o.year = 0;//年
    o.month = 0;//月
    o.day = 0;//日
    o.hours = 0;//时
    o.minutes = 0;//分
    o.seconds = 0;//秒
    o.milliseconds = 0;//毫秒
    o.totalYear = 0.00;//从时间原点的年
    o.totalMonth = 0.00;//从时间原点到现在的月
    o.totalDay = 0.00;//从时间原点到现在的天
    o.totalHours = 0.00;//从时间原点到现在的小时
    o.totalMinutes = 0.00;//从时间原点到现在的分
    o.totalSeconds = 0.00;//从时间原点到现在的秒
    o.totalMilliseconds = 0.00;//从时间原点到现在的毫秒
    //初始化对象
    o.init = function (timestamp) {
        var odate = new Date(timestamp);
        o.year = odate.getFullYear();
        o.month = odate.getMonth() + 1;
        o.day = odate.getDate();
        o.hours = odate.getHours();
        o.minutes = odate.getMinutes();
        o.seconds = odate.getSeconds();
        o.milliseconds = odate.getMilliseconds();

        o.totalMilliseconds = timestamp;
        o.totalSeconds = (timestamp / 1000).toFixed(2);
        o.totalMinutes = (timestamp / 1000 / 60).toFixed(2);
        o.totalHours = (timestamp / 1000 / 60 / 60).toFixed(2);
        o.totalDay = (timestamp / 1000 / 60 / 60 / 24).toFixed(2);
        o.totalMonth = o.year * 12;
        o.totalYear = o.year;
    }
    //无参则返回空对象
    if (arguments.length == 0) {

    }
    else if (typeof (arguments[0]) === "string") {
        o.init(new Date(arguments[0]));
    }
    else if (typeof (arguments[0]) === "number") {
        o.init(arguments[0]);
    } else if (typeof(arguments[0]) === "object") {
        o.init(arguments[0]);
    }
    return o;
}