js 时间Date操作 工具类

/*
*javascript 中 Date的工具类，方便string格式的与js时间互转
*主要方法：addDays,addMonths,addYears
*/
function runtime(datetime) {
    this._millsec = 0;
    var _datetime = null;
    switch (typeof datetime) {
        case 'string':
            _datetime = this.strToDate(datetime);
            break;
        case 'number':
        case 'object':
            _datetime = new Date(datetime);
            break;
        default:
            _datetime = new Date();
            break;
    }
    this._millsec = _datetime.getTime();
    this._synFromMillSec();
}
runtime.prototype._synFromMillSec = function () {
    var datetime = new Date(this._millsec);
    this.dateTime = datetime;
    this.month = datetime.getMonth();
    this.year = datetime.getFullYear();
    this.dayOfMonth = datetime.getDate();
    this.dayOfWeek = datetime.getDay();
    this.hours = datetime.getHours();
    this.mins = datetime.getMinutes();
    this.seconds = datetime.getSeconds();
    this.milliSeconds = datetime.getMilliseconds();
    this.totalMilliSeconds = this._millsec;
}

runtime.prototype._synFromNumber = function () {
    var datetime = new Date(this.year, this.month, this.dayOfMonth, this.hour, this.mins, this.seconds, this.milliSeconds);
    this._millsec = datetime.getMilliseconds();
    this.dateTime = datetime;
    this.totalMilliSeconds = this._millsec;
}

//当前时间加毫秒 返回当前实例 [整数]
runtime.prototype.addMilliSeconds = function (ms) {
    this._millsec += ms;
    this._synFromMillSec();
    return this;
}
//当前时间加秒 返回当前实例 [整数]
runtime.prototype.addSeconds = function (sec) {
    return this.addMilliSeconds(sec * 1000);
}
//当前时间加分钟 返回当前实例 [整数]
runtime.prototype.addMins = function (mins) {
    return this.addMilliSeconds(mins * 60 * 1000);
}
//当前时间加小时 返回当前实例 [整数]
runtime.prototype.addHours = function (hours) {
    return this.addMilliSeconds(hours * 60 * 60 * 1000);
}
//当前时间加天 返回当前实例 [整数]
runtime.prototype.addDays = function (days) {
    return this.addMilliSeconds(days * 24 * 60 * 60 * 1000);
}
//当前时间加周 返回当前实例 [整数]
runtime.prototype.addWeeks = function (weeks) {
    return this.addMilliSeconds(weeks * 7 * 24 * 60 * 60 * 1000);
}

//当前时间加月 返回当前实例 [整数]
runtime.prototype.addMonths = function (months) {
    var tm = months % 12;
    var ty = (months - tm) / 12;
    var cm = this.month + tm;
    if (cm > 11) {
        ty++;
        cm = cm - 11;
    } else if (cm < 0) {
        ty--;
        cm = cm + 11;
    }
    this.year += ty;
    this.month = cm;
    var currMDays = this.monthDays();
    if (currMDays < this.dayOfMonth) {
        this.dayOfMonth = currMDays;
    }
    this._synFromNumber();
    return this;
}
//当前时间加年 返回当前实例 [整数]
runtime.prototype.addYears = function (years) {
    return this.addMonths(years * 12);
}

//是否是润年
runtime.prototype.isRun = function () {
    var pYear = this.year;
    if ((pYear % 4 == 0 && pYear % 100 != 0) || (pYear % 100 == 0 && pYear % 400 == 0)) {
        return true;
    } else {
        return false;
    }
}
//当月天数
runtime.prototype.monthDays = function () {
    switch (this.month + 1) {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            return 31;
        case 2:
            if (this.isRun())
                return 29;
            return 28;
        default:
            return 30;
    }
}
//中文星期
runtime.prototype.weekToCnName = function () {
    var show_day = new Array('星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六');
    return show_day[this.dayOfWeek];
}

//string 转 Date 如：2012-12-12 01:01:01
runtime.prototype.strToDate = function (str) {
    if (!str)
        return;
    var s = str + '';
    var sp = '';
    if (s.indexOf('-') > 0) {
        sp = '-';
    } else if (s.indexOf('/') > 0) {
        sp = '/';
    }
    else {
        return;
    }
    var year = s.match(new RegExp('[0-9]{4}'))[0];
    var month = s.match(new RegExp(sp + '[0-9]{1,2}', 'g'))[0].replace(sp + "", '');
    var day = s.match(new RegExp(sp + '[0-9]{1,2}', 'g'))[1].replace(sp + "", '');
    var contain_time = s.indexOf(':') > 0;
    var hour = 0, min = 0, second = 0, ms = 0;
    if (contain_time) {
        hour = s.match(new RegExp('[0-9]{2}:', 'g'))[0].replace(/:/g, '');
        min = s.match(new RegExp('[0-9]{2}:', 'g'))[1].replace(/:/g, '');
        second = s.match(new RegExp(':[0-9]{2}', 'g'))[1].replace(/:/g, '');
        ms = s.match(new RegExp('.[0-9]{3}$', 'g'))[0].replace(/./g, '');
        hour = parseInt(hour);
        min = parseInt(min);
        second = parseInt(second);
        if (ms)
            ms = parseInt(ms);
        else
            ms = 0;
    }
    var dt = new Date(parseInt(year), parseInt(month) - 1, parseInt(day), hour, min, second, ms);
    return dt;
}
// 深copy当前对象
runtime.prototype.clone = function () {
    return new runtime(this.dateTime);
}

//转字符串输入 如 fmt=yyyy年MM月dd日cweek
runtime.prototype.formatDateString = function (fmt) {
    var result = fmt || "";
    result = result.replace(/yyyy/g, this.year)
        .replace(/yy/g, this.year.toString().substr(2, 2))
        .replace(/MM/g, (this.month + 1) < 10 ? ('0' + (this.month + 1).toString()) : (this.month + 1))
        .replace(/M/g, (this.month + 1).toString())
        .replace(/dd/g, this.dayOfMonth < 10 ? ('0' + this.dayOfMonth) : this.dayOfMonth)
        .replace(/d/g, this.dayOfMonth)
        .replace(/HH/g, this.hours < 10 ? ('0' + this.hours) : this.hours)
        .replace(/H/g, this.hours)
        .replace(/mm/g, this.mins < 10 ? ('0' + this.mins) : this.mins)
        .replace(/m/g, this.mins)
        .replace(/ss/g, this.seconds < 10 ? ('0' + this.seconds) : this.seconds)
        .replace(/s/g, this.seconds)
        .replace(/fff/g, this.milliSeconds < 10 ? ('00' + this.milliSeconds) : (this.milliSeconds < 100 ? ('0' + this.milliSeconds) : (this.milliSeconds)))
        .replace(/ff/g, this.milliSeconds)
        .replace(/f/g, this.milliSeconds)
        .replace(/cweek/g, this.weekToCnName());
    return result;
}

//转为string
runtime.prototype.toString = function () {
    return this.formatDateString('yyyy/MM/dd HH:mm:ss.fff');
}