日期輸出格式函數

DateFormat.js

Date.prototype.format = (function () {
    var month_str = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
    var day_str = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

    function ParseRepeatPattern(str, pos, char) {
        var len = str.length;
        var num = pos + 1;
        while (num < len && str.substr(num, 1) == char) {
            num++;
        }
        return num - pos;
    }

    function right(str, len) {
        str = String(str);
        return str.substr(str.length - len);
    }

    function padleft(str, len, char) {
        if (!char) char = '0';

        str = String(str);
        while (str.length < len) {
            str = char + str;
        }
        return str;
    }

    function Format(format) {
        if (!format.length) return this.toString();

        var date = this;
        var str = format;
        var strf = str.replace(/{{(\w+)}}/g, function (ret) {
            var f = ret.substr(2, ret.length - 4);
            var c = f.substr(0, 1);

            var num = ParseRepeatPattern(f, 0, c);;

            switch (c) {
                case 'y':
                    return (num == 3) ?
                        date.getFullYear() - 1911 :
                        right(date.getFullYear(), num);
                    break;
                case 'M':
                    return (num < 3) ?
                        padleft(date.getMonth() + 1, num) :
                        month_str[date.getMonth()].substr(0, num);
                    break;
                case 'd':
                    return (num < 3) ?
                        padleft(date.getDate(), num) :
                        day_str[date.getDay()].substr(0, num);
                    break;
                case 'h':
                    var h = date.getHours();
                    if (h > 12) h -= 12;
                    return padleft(h, num);
                    break;
                case 'H':
                    return padleft(date.getHours(), num);
                    break;
                case 'm':
                    return padleft(date.getMinutes(), num);
                    break;
                case 's':
                    return padleft(date.getSeconds(), num);
                    break;
                case 'f':
                    return date.getMilliseconds().toString().substr(0, num);
                    break;
                case 't':
                    var t = date.getHours() < 12 ? "AM" : "PM";
                    return t.substr(0, num);
                    break;
                case 'T':
                    var t = date.getHours() < 12 ? "上午" : "下午";
                    return t;
                    break;
                case 'z':
                    var zo = date.getTimezoneOffset();
                    var z = zo / 60;
                    var a = z >= 0 ? "+" : "-";

                    return num > 2 ?
                        a + padleft(Math.abs(z), 2) + ":00" :
                        a + padleft(Math.abs(z), num);
                    break;
            }

            return '';
        });
        return strf;
    }

    return Format;
})();