javascript 计算两个日期的差值

/** * TimeSpan just like the class TimpSpan in C# ,represent the time difference * @class TimeSpan */class TimeSpan {    constructor(millionseconds: number) {        this.totalMillionseconds = millionseconds;        this.totalSeconds = millionseconds / 1000;        this.totalMinutes = this.totalSeconds / 60;        this.totalHours = this.totalMinutes / 60;        this.totalDays = this.totalHours / 24;        this.day = Math.floor(millionseconds / (1000 * 60 * 60 * 24));        let surplus = millionseconds % (1000 * 60 * 60 * 24);        this.hour = surplus / (1000 * 60 * 60);        surplus = surplus % (1000 * 60 * 60);        this.minute = surplus / (1000 * 60);        surplus = surplus % (1000 * 60);        this.second = surplus / (1000);        surplus = surplus % (1000);        this.millionsecond = surplus;    }    totalDays: number;    totalHours: number;    totalMinutes: number;    totalSeconds: number;    totalMillionseconds: number;    day: number;    hour: number;    minute: number;    second: number;    millionsecond: number;    /**     * if the date2 later than date 1 ,it's true     * @type {boolean}     * @memberOf TimeSpan     */    isPositive: boolean;}/** * The Aqua class * @class Aqua */class Aqua {    /**     * 将Date对象转换为 UTC 时间 毫秒数     * convert Date object to UTC time millionseconds     * @param {Date} date     * @returns {number}     */    UTC(date: Date): number {        return Date.UTC(            date.getUTCFullYear(),            date.getUTCMonth(),            date.getUTCDate(),            date.getUTCHours(),            date.getUTCMinutes(),            date.getUTCSeconds()        )    }    /**     * compare to two date ,caculate the difference      * 对比两个日期，计算他们的差值     * @param {Date} date1     * @param {Date} date2     * @returns {TimeSpan}     */    compareDate(date1: Date, date2: Date): TimeSpan {        let number1 = this.UTC(date1);        let number2 = this.UTC(date2);        let isPositive = number2 > number1;        number1 = Math.abs(number1);        number2 = Math.abs(number2);        let res = new TimeSpan(Math.abs(number2 - number1));        res.isPositive = isPositive;        return res;    }}

/** * TimeSpan just like the class TimpSpan in C# ,represent the time difference * @class TimeSpan */var TimeSpan = (function () {    function TimeSpan(millionseconds) {        this.totalMillionseconds = millionseconds;        this.totalSeconds = millionseconds / 1000;        this.totalMinutes = this.totalSeconds / 60;        this.totalHours = this.totalMinutes / 60;        this.totalDays = this.totalHours / 24;        this.day = Math.floor(millionseconds / (1000 * 60 * 60 * 24));        var surplus = millionseconds % (1000 * 60 * 60 * 24);        this.hour = surplus / (1000 * 60 * 60);        surplus = surplus % (1000 * 60 * 60);        this.minute = surplus / (1000 * 60);        surplus = surplus % (1000 * 60);        this.second = surplus / (1000);        surplus = surplus % (1000);        this.millionsecond = surplus;    }    return TimeSpan;}());   /**     * 将Date对象转换为 UTC 时间 毫秒数     * convert Date object to UTC time millionseconds     * @param {Date} date     * @returns {number}     */    Aqua.prototype.UTC = function (date) {        return Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate(), date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds());    };    /**     * compare to two date ,caculate the difference     * 对比两个日期，计算他们的差值     * @param {Date} date1     * @param {Date} date2     * @returns {TimeSpan}     */    Aqua.prototype.compareDate = function (date1, date2) {        var number1 = this.UTC(date1);        var number2 = this.UTC(date2);        var isPositive = number2 > number1;        number1 = Math.abs(number1);        number2 = Math.abs(number2);        var res = new TimeSpan(Math.abs(number2 - number1));        res.isPositive = isPositive;        return res;    };