/**
* jquery.timer.js
* 在网页上显示日期和时间控件
* 使用方法:$('#timeDisp').timer(); 
* $('#timer').timer({ format: "yy年mm月dd日 W HH:MM:ss" });
* @author SuperBoy
* 日期格式说明:
> 
> *yy: 四位年份,如:2009
> *y : 两位年份,如:09
> *mm: 两位月份,不足在前补0,如:02
> *m : 一位月份,不补0,如:02
> *dd: 月份中的日,两位表示,不足补0,如:02
> *d : 月份中的日,不足补0,如:2
> *W : 星期的全称,如:星期一
> *w : 星期的略称,如:周一
> *HH:24小时制小时,不足两位补0,如:08,13
> *H:24小时制,不补0,如:8,13
> *hh: 12小时制,不足两位补0并且会在加上am或pm进行区分,如01:12:20 am
> *h : 12小时制,不补0并且会在加上am或pm进行区分,如1:12:20 am
> *MM:分钟表示,不足两位补0,如:08
> *M:分钟表示,不补0,如:8
> *ss:秒表示,不足两位补0,如:08
> *s:秒表示,不补0,如:8
> *SSS:表示毫秒
> 
*/
(function($) {
    function Timer() {
        this._defaults = {
            format: "yy-mm-dd W hh:MM:ss",
            morning: "上午",
            afterNoon: "下午",
            weekNames: ['星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六'],
            weekNamesShort: ['周日', '周一', '周二', '周三', '周四', '周五', '周六']
        };
        $.extend(this._defaults);
    }
    $.extend(Timer.prototype, {
        _settings: {},
        _init: function(target, options) {
            this._settings["target"] = target;
            if (!options) {
                options = this._defaults;
            }
            this._settings["format"] = options["format"] ? options["format"] : this._defaults["format"];
            this._settings["morning"] = options["morning"] ? options["morning"] : this._defaults["morning"];
            this._settings["afterNoon"] = options["afterNoon"] ? options["afterNoon"] : this._defaults["afterNoon"];
            this._settings["weekNames"] = options["weekNames"] ? options["weekNames"] : this._defaults["weekNames"];
            this._settings["weekNamesShort"] = options["weekNamesShort"] ? options["weekNamesShort"] : this._defaults["weekNamesShort"];

            setInterval('$.timer._setValue()', 1);
        },
        /**
        *yy: 四位年份,如:2009
        *y : 两位年份,如:09
        *mm: 两位月份,不足在前补0,如:02
        *m : 一位月份,不补0,如:02
        *dd: 月份中的日,两位表示,不足补0,如:02
        *d : 月份中的日,不足补0,如:2
        *W : 星期的全称,如:星期一
        *w : 星期的略称,如:周一
        *HH:24小时制小时,不足两位补0,如:08,13
        *H:24小时制,不补0,如:8,13
        *hh: 12小时制,不足两位补0并且会在加上am或pm进行区分,如01:12:20 am
        *h : 12小时制,不补0并且会在加上am或pm进行区分,如1:12:20 am
        *MM:分钟表示,不足两位补0,如:08
        *M:分钟表示,不补0,如:8
        *ss:秒表示,不足两位补0,如:08
        *s:秒表示,不补0,如:8
        *SSS:表示毫秒
        */
        _formatDate: function(date) {
            var format = this._settings["format"];
            var dateStr = format;
            var showHour = dateStr.indexOf('h') != -1;
            dateStr = dateStr.replace(/yy/, date.getFullYear());
            dateStr = dateStr.replace(/y/, (date.getYear()).toString().substr(2));
            dateStr = dateStr.replace(/mm/, this._appendZero(date.getMonth()+1, 2));
            dateStr = dateStr.replace(/m/, date.getMonth());
            dateStr = dateStr.replace(/dd/, this._appendZero(date.getDate(), 2));
            dateStr = dateStr.replace(/d/, date.getDate());
            dateStr = dateStr.replace(/W/, this._settings["weekNames"][date.getDay()]);
            dateStr = dateStr.replace(/w/, this._settings["weekNamesShort"][date.getDay()]);
            // 24小时制
            dateStr = dateStr.replace(/HH/, this._appendZero(date.getHours(), 2));
            dateStr = dateStr.replace(/H/, date.getHours());
            // 12小时制
            dateStr = dateStr.replace(/hh/, this._appendZero(date.getHours() > 12 ? (date.getHours() - 12) : date.getHours(), 2));
            dateStr = dateStr.replace(/h/, date.getHours() > 12 ? (date.getHours() - 12) : date.getHours());
            dateStr = dateStr.replace(/MM/, this._appendZero(date.getMinutes(), 2));
            dateStr = dateStr.replace(/M/, date.getMinutes());
            dateStr = dateStr.replace(/ss/, this._appendZero(date.getSeconds(), 2));
            dateStr = dateStr.replace(/s/, date.getSeconds());
            dateStr = dateStr.replace(/SSS/, this._appendZero(date.getMilliseconds(), 3));
            dateStr = dateStr.replace(/SS/, this._appendZero(date.getMilliseconds(), 2));
            dateStr = dateStr.replace(/S/, date.getMilliseconds());
            if (showHour) {
                if (date.getHours() - 12 >= 0) {
                    dateStr = dateStr + this._settings["afterNoon"];
                } else {
                    dateStr = dateStr + this._settings["morning"];
                }
            }
            return dateStr;
        },
        _appendZero: function(value, length) {
            if (value) {
                value = (value).toString();
                if (value.length < length) {
                    for (var i = 0; i < length - value.length; i++) {
                        value = "0" + value;
                    }
                }
            }
            return value;
        },
        _setValue: function() {
            var date = new Date();
            var target = this._settings["target"];
            date = this._formatDate(date)
            if (target.nodeName == "INPUT") {
                $(target).val(date);
            } else {
                $(target).text(date);
            }
        }
    });
    $.fn.timer = function(options) {
        return this.each(function() {
            $.timer._init(this, options);
        });
    }

    $.timer = new Timer();

})(jQuery);