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给 Javascript 的 日期（Date）对象扩展一个格式化（format）方法

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直接贴代码了：

 

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <script type="text/javascript">
        var dateFormat = function ()
        {
            var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
            timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
            timezoneClip = /[^-+\dA-Z]/g,
            pad = function (val, len)
            {
                val = String(val);
                len = len || 2;
                while (val.length < len) val = "0" + val;
                return val;
            };

            // Regexes and supporting functions are cached through closure
            return function (date, mask, utc)
            {
                var dF = dateFormat;

                // You can't provide utc if you skip other args (use the "UTC:" mask prefix)
                if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date))
                {
                    mask = date;
                    date = undefined;
                }

                // Passing date through Date applies Date.parse, if necessary
                date = date ? new Date(date) : new Date;
                if (isNaN(date)) throw SyntaxError("invalid date");

                mask = String(dF.masks[mask] || mask || dF.masks["default"]);

                // Allow setting the utc argument via the mask
                if (mask.slice(0, 4) == "UTC:")
                {
                    mask = mask.slice(4);
                    utc = true;
                }

                var _ = utc ? "getUTC" : "get",
            d = date[_ + "Date"](),
            D = date[_ + "Day"](),
            m = date[_ + "Month"](),
            y = date[_ + "FullYear"](),
            H = date[_ + "Hours"](),
            M = date[_ + "Minutes"](),
            s = date[_ + "Seconds"](),
            L = date[_ + "Milliseconds"](),
            o = utc ? 0 : date.getTimezoneOffset(),
            flags = {
                d: d,
                dd: pad(d),
                ddd: dF.i18n.dayNames[D],
                dddd: dF.i18n.dayNames[D + 7],
                m: m + 1,
                mm: pad(m + 1),
                mmm: dF.i18n.monthNames[m],
                mmmm: dF.i18n.monthNames[m + 12],
                yy: String(y).slice(2),
                yyyy: y,
                h: H % 12 || 12,
                hh: pad(H % 12 || 12),
                H: H,
                HH: pad(H),
                M: M,
                MM: pad(M),
                s: s,
                ss: pad(s),
                l: pad(L, 3),
                L: pad(L > 99 ? Math.round(L / 10) : L),
                t: H < 12 ? "a" : "p",
                tt: H < 12 ? "am" : "pm",
                T: H < 12 ? "A" : "P",
                TT: H < 12 ? "AM" : "PM",
                Z: utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
                o: (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
                S: ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
            };

                return mask.replace(token, function ($0)
                {
                    return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
                });
            };
        } ();

        // Some common format strings
        dateFormat.masks = {
            "default": "ddd mmm dd yyyy HH:MM:ss",
            shortDate: "m/d/yy",
            mediumDate: "mmm d, yyyy",
            longDate: "mmmm d, yyyy",
            fullDate: "dddd, mmmm d, yyyy",
            shortTime: "h:MM TT",
            mediumTime: "h:MM:ss TT",
            longTime: "h:MM:ss TT Z",
            isoDate: "yyyy-mm-dd",
            isoTime: "HH:MM:ss",
            isoDateTime: "yyyy-mm-dd'T'HH:MM:ss",
            isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
        };

        // Internationalization strings
        dateFormat.i18n = {
            dayNames: [
                "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
                "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
            ],
                    monthNames: [
                "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
                "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
            ]
        };

        // For convenience...
        Date.prototype.format = function (mask, utc)
        {
            return dateFormat(this, mask, utc);
        };

        var showArray = new Array();
        showArray.push("现在的日期（）：" + new Date().format());
        showArray.push("现在的日期（yyyy-mm-dd HH:MM:ss）：" + new Date().format("yyyy-mm-dd HH:MM:ss"));
        showArray.push("现在的日期（yyyy/mm/dd）：" + new Date().format("yyyy/mm/dd"));

        alert(showArray.join("\n"));
    </script>
</head>
<body>

</body>
</html>
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如果觉得上面的 format 方法还不能达到要求，试试下面的这个 toString 方法：

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Date.prototype.toString=function(format,loc){
    var time={};
    time.Year=this.getFullYear();
    time.TYear=(""+time.Year).substr(2);
    time.Month=this.getMonth()+1;
    time.TMonth=time.Month<10?"0"+time.Month:time.Month;
    time.Day=this.getDate();
    time.TDay=time.Day<10?"0"+time.Day:time.Day;
    time.Hour=this.getHours();
    time.THour=time.Hour<10?"0"+time.Hour:time.Hour;
    time.hour=time.Hour<13?time.Hour:time.Hour-12;
    time.Thour=time.hour<10?"0"+time.hour:time.hour;
    time.Minute=this.getMinutes();
    time.TMinute=time.Minute<10?"0"+time.Minute:time.Minute;
    time.Second=this.getSeconds();
    time.TSecond=time.Second<10?"0"+time.Second:time.Second;
    time.Millisecond=this.getMilliseconds();
    time.Week=this.getDay();

    var MMMArrEn=["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"];
    var MMMArr=["一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"];
    var WeekArrEn=["Sun","Mon","Tue","Web","Thu","Fri","Sat"];
    var WeekArr=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];

    var oNumber=time.Millisecond/1000;

    if(format!=undefined && format.replace(/\s/g,"").length>0){
        if(loc!=undefined && loc =="en"){
            MMMArr=MMMArrEn.slice(0);
            WeekArr=WeekArrEn.slice(0);
        }
        format=format
            .replace(/yyyy/ig,time.Year)
            .replace(/yyy/ig,time.Year)
            .replace(/yy/ig,time.TYear)
            .replace(/y/ig,time.TYear)
            .replace(/MMM/g,MMMArr[time.Month-1])
            .replace(/MM/g,time.TMonth)
            .replace(/M/g,time.Month)
            .replace(/dd/ig,time.TDay)
            .replace(/d/ig,time.Day)
            .replace(/HH/g,time.THour)
            .replace(/H/g,time.Hour)
            .replace(/hh/g,time.Thour)
            .replace(/h/g,time.hour)
            .replace(/mm/g,time.TMinute)
            .replace(/m/g,time.Minute)
            .replace(/ss/ig,time.TSecond)
            .replace(/s/ig,time.Second)
            .replace(/fff/ig,time.Millisecond)
            .replace(/ff/ig,oNumber.toFixed(2)*100)
            .replace(/f/ig,oNumber.toFixed(1)*10)
            .replace(/EEE/g,WeekArr[time.Week]);
    }
    else{
        format=time.Year+"-"+time.Month+"-"+time.Day+" "+time.Hour+":"+time.Minute+":"+time.Second;
    }
    return format;
}


Demo：

var d=new Date();
console.log(d.toString());    //2012-7-27 9:26:52
console.log(d.toString(""));    //2012-7-27 9:26:52
console.log(d.toString("yyyy-MM-dd HH:mm:ss"));    //2012-07-27 09:26:52
console.log(d.toString("yyyy年MM月dd日 HH:mm:ss"));    //2012年07月27日 09:26:52
console.log(d.toString("yyyy-MM-dd HH:mm:ss fff"));    //2012-07-27 09:26:52 237
console.log(d.toString("yyyy年 MMM dd EEE"));    //2012年 七月 27 星期五
console.log(d.toString("yyyy MMM dd EEE","en"));    //2012 Jul 27 Fri
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谢谢浏览！

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