Date.prototype.format = function (formatStr) {

    var date = this;

    /*

    函数：填充0字符

    参数：value-需要填充的字符串, length-总长度

    返回：填充后的字符串

    */

    var zeroize = function (value, length) {

        if (!length) {

            length = ;

        }

        value = new String(value);

        for (var i = , zeros = ''; i < (length - value.length); i++) {

            zeros += '';

        }

        return zeros + value;

    };

    return formatStr.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|M{1,4}|yy(?:yy)?|([hHmstT])\1?|[lLZ])\b/g, function ($0) {

        switch ($) {

            case 'd': return date.getDate();

            case 'dd': return zeroize(date.getDate());

            case 'ddd': return ['Sun', 'Mon', 'Tue', 'Wed', 'Thr', 'Fri', 'Sat'][date.getDay()];

            case 'dddd': return ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][date.getDay()];

            case 'M': return date.getMonth() + ;

            case 'MM': return zeroize(date.getMonth() + );

            case 'MMM': return ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][date.getMonth()];

            case 'MMMM': return ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'][date.getMonth()];

            case 'yy': return new String(date.getFullYear()).substr();

            case 'yyyy': return date.getFullYear();

            case 'h': return date.getHours() %  || ;

            case 'hh': return zeroize(date.getHours() %  || );

            case 'H': return date.getHours();

            case 'HH': return zeroize(date.getHours());

            case 'm': return date.getMinutes();

            case 'mm': return zeroize(date.getMinutes());

            case 's': return date.getSeconds();

            case 'ss': return zeroize(date.getSeconds());

            case 'l': return date.getMilliseconds();

            case 'll': return zeroize(date.getMilliseconds());

            case 'tt': return date.getHours() <  ? 'am' : 'pm';

            case 'TT': return date.getHours() <  ? 'AM' : 'PM';

        }

    });

}

   //增加天数

        function addDays(fDate, days) {

            var result;

            var time = new Date(fDate).getTime();

            var oneDayLong =  *  *  * ;

            result = time + days * oneDayLong;

            result = new Date(result).format("yyyy-MM-dd");

            return result;

        }