jQuery.fn.extend({
    countdown: function(options) {
        options = options || {};
        options.end = Number(options.end) || "";
        options.interval = options.interval || 1000;
        options.ontimeout = options.ontimeout || function() { };
        options.global = options.global || 0;
        options.format = options.format || 'm'; //可以是Time,或者Minute
        options.inputType = options.inputType || 'm';
        var FORMATID = "format";

        this.data(FORMATID, options.format);
        this.data('ss', options.ontimeout);
        jQuery.countdowInterval = options.interval;
        jQuery.onCountdown = function(container, count) {

            container.html(jQuery.timeTranform(count <= 0 ? 0 : count, container.data(FORMATID)));
            if (count <= 0)
                container.data('ss')(); //options.ontimeout(); 
        }

        if (isNaN(options.end))
            return;

        var count = jQuery.fromTimes(options.end, options.inputType);

        return this.each(function() {
            var me = $(this);
            me.data(jQuery.STOPPOINTID, 0);
            jQuery.stopwatch(me, count);
        });
    },
    calcTimer: function(options) {
        options = options || {};
        options.limit = options.limit || "";
        options.interval = options.interval || 1000;
        options.ontimeout = options.ontimeout || function() { };
        options.onCountdownError = options.onCountdownError || function() { };
        options.format = options.format || 's'; //可以是Time,或者Minute
        var FORMATID = "format";

        this.data(FORMATID, options.format);
        this.data('ss', options.ontimeout);
        jQuery.countdowInterval = options.interval;
        jQuery.onCountdownErr = function(container) {
            options.onCountdownError(container);
        }
        jQuery.onCountdown = function(container, count) {
            container.html(jQuery.timeTranform(count <= 0 ? 0 : count, container.data(FORMATID)));
            if (count <= 0)
                container.data('ss')(); //options.ontimeout();
        }
        if (isNaN(options.limit))
            return;

        return this.each(function() {
            var me = $(this);
            jQuery.calcSecond(me, options.limit);
        });
    },
    addminute: function(minute) {
        var sec = jQuery.fromMinutes(minute);
        return this.each(function() {
            var me = $(this);
            jQuery.stopwatch(me, sec);
        });
    },
    gettime: function() {
        return this.data(jQuery.STOPPOINTID);
    },
    clear: function() {
        if (this.data(jQuery.INTERVALID))
            window.clearInterval(this.data(jQuery.INTERVALID));
    }
});

jQuery.extend({
    INTERVALID: "intervalID",
    STOPPOINTID: "stopPoint",
    LASTPOINTID: "lastPoint",
    countdowInterval: 1000,
    onCountdown: function(container, count) { },
    onCountdownErr: function(container) { },
    calcSecond: function(container, sec) {
        var me = this;
        var intervalID = container.data(me.INTERVALID);
        if (intervalID)
            window.clearInterval(intervalID);
        var now = new Date();

        // 根据传入参数计算结束时间
        var stopPoint = now.addSeconds(sec);
        container.data(me.STOPPOINTID, stopPoint);

        // 如果当前时间已经大于结束时间,则返回0标识结束
        if (stopPoint <= now) {
            me.onCountdown(container, 0);
        }
        else {
            // 间隔指定时间倒计时
            intervalID = window.setInterval(function() {
                var endPoint = container.data(me.STOPPOINTID);
                var curDate = new Date();
                if (curDate >= endPoint) {
                    window.clearInterval(container.data(me.INTERVALID));
                    me.onCountdown(container, 0);
                }
                else {
                    var point = curDate.dateDiff('s', endPoint);

                    // 检查上次时间是否小于本次时间,若是,表示用户修改了本地计算机时间
                    var lastPoint = container.data(me.LASTPOINTID);                    
                    if (lastPoint && lastPoint < point)
                        me.onCountdownErr(container);
                    container.data(me.LASTPOINTID, point);
                    me.onCountdown(container, point);
                }
            }, me.countdowInterval);

            container.data(me.INTERVALID, intervalID);
        }
    },
    stopwatch: function(container, limit) {
        var me = this;
        // 如果已经开始计时,则清除后重新计算
        var intervalID = container.data(me.INTERVALID);
        if (intervalID != null) {
            window.clearInterval(intervalID);
        }
        // 计算总计数,并累加至内存中
        var stopPoint = container.data(me.STOPPOINTID);
        if (stopPoint == null)
            stopPoint = 0;

        stopPoint = stopPoint + limit;

        container.data(me.STOPPOINTID, stopPoint);

        if (stopPoint <= 0) {
            //stopPoint = 0;
            me.onCountdown(container, stopPoint);
            return;
        }

        // 开始倒计时,当到达0时停止
        intervalID = window.setInterval(function() {
            stopPoint = stopPoint - 1;
            if (Number(stopPoint) <= 0) {
                window.clearInterval(container.data(me.INTERVALID));
            }
            container.data(me.STOPPOINTID, stopPoint);
            me.onCountdown(container, stopPoint);
        }, me.countdowInterval);

        container.data(me.INTERVALID, intervalID);
    },
    timeTranform: function(count, format) {
        if (format == null)
            return count;
        var unit = format.toLowerCase();
        if (unit == "h" || unit == "hour")
            return Math.floor(count / 3600);
        if (unit == "m" || unit == "minute")
            return Math.floor(count / 60);
        if (unit == "s" || unit == "second")
            return count;
        return this.timeFormatTranformer(count, format);
    },
    timeFormatTranformer: function(count, format) {
        var hours = Math.floor(count / 3600);
        var minute = Math.floor(count % 3600 / 60);
        var second = Math.floor(count % 3600 % 60);
        return format.replace(/#h/i, hours).replace(/#m/i, minute).replace(/#s/i, second);
    },
    fromTimes: function(count, format) {
        if (/^s$/i.test(format))
            return count;
        if (/^m$/i.test(format))
            return this.fromMinutes(count);
        if (/^h$/i.test(format))
            return this.fromHours(count);
    },
    fromMinutes: function(minute) {
        return minute * 60;
    },
    fromHours: function(hours) {
        return hours * 3600;
    }
});
Date.prototype.add = function (milliseconds) {
    var m = this.getTime() + milliseconds;
    return new Date(m);
};
Date.prototype.addSeconds = function (second) {
    return this.add(second * 1000);
};
Date.prototype.addMinutes = function (minute) {
    return this.addSeconds(minute * 60);
};
Date.prototype.addHours = function (hour) {
    return this.addMinutes(60 * hour);
};
Date.prototype.dateDiff = function (interval, objDate2) {
    var d = this, i = {}, t = d.getTime(), t2 = objDate2.getTime();
    i['y'] = objDate2.getFullYear() - d.getFullYear();
    i['q'] = i['y'] * 4 + Math.floor(objDate2.getMonth() / 4) - Math.floor(d.getMonth() / 4);
    i['m'] = i['y'] * 12 + objDate2.getMonth() - d.getMonth();
    i['ms'] = objDate2.getTime() - d.getTime();
    i['w'] = Math.floor((t2 + 345600000) / (604800000)) - Math.floor((t + 345600000) / (604800000));
    i['d'] = Math.floor(t2 / 86400000) - Math.floor(t / 86400000);
    i['h'] = Math.floor(t2 / 3600000) - Math.floor(t / 3600000);
    i['n'] = Math.floor(t2 / 60000) - Math.floor(t / 60000);
    i['s'] = Math.floor(t2 / 1000) - Math.floor(t / 1000);
    return i[interval];
};
Date.prototype.Format = function (formatStr) {
    var str = formatStr;
    var Week = ['日', '一', '二', '三', '四', '五', '六'];

    str = str.replace(/yyyy|YYYY/, this.getFullYear());
    str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));

    var month = this.getMonth() + 1;
    str = str.replace(/MM/, month > 9 ? month.toString() : '0' + month);
    str = str.replace(/M/g, month);

    str = str.replace(/w|W/g, Week[this.getDay()]);

    str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());
    str = str.replace(/d|D/g, this.getDate());

    str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());
    str = str.replace(/h|H/g, this.getHours());
    str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());
    str = str.replace(/m/g, this.getMinutes());

    str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());
    str = str.replace(/s|S/g, this.getSeconds());

    return str;
}