跳过缩写月份名称为月

问题描述：

怎么能低于现有的代码进行修改，例如，使用DATEFORMAT面膜时：mediumDateTime是5月份一个月名没有在一个时期它，但当月名的其余部分将继续缩写

January - Jan. 
February - Feb. 
March - Mar. 
April - Apr. 
May - May 
June - Jun. 
July - Jul. 
August - Aug. 
September - Sep. 
October - Oct. 
November - Nov. 
December - Dec. 

/* 
* Date Format 1.2.3/Difference in Days 
* (c) 2007-2009 Steven Levithan <stevenlevithan.com> 
* MIT license 
* 
* Includes enhancements by Scott Trenda <scott.trenda.net> 
* and Kris Kowal <cixar.com/~kris.kowal/> 
* 
* Accepts a date, a mask, or a date and a mask. 
* Returns a formatted version of the given date. 
* The date defaults to the current date/time. 
* The mask defaults to dateFormat.masks.default. 
*/ 

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(date,isoDateTime) 
dateFormat.masks = { 
    "default":  "dd/mm/yyyy h:MMtt", 
    shortDate:  "dd/mm/yyyy", 
    mediumDate:  "mmm. d, yyyy", 
    mediumDateTime: "mmm. d, yyyy h:MM TT", 
    longDate:  "mmmm d, yyyy", 
    'longDateTime': "mmmm d, yyyy h:MM TT", 
    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'", 
    "SQLDateTime": "yyyy-mm-dd h:MM TT", 
    "SQLDate":  "yyyy-mm-dd", 
    "OutlookDate": "mm/dd/yyyy h:MM TT", //Proper format is: 05/26/2000 9:00 AM 
    "BFDate":  "mm/dd/yyyy", 
    "weekdayname": "dddd", 
    "monthdaynum": "dd" 
}; 

// 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); 
};

约定是不要把缩写个月后一段时间，所以你为什么要这么做？ – RobG

答

因为似乎没有要在那里May.将所需的情况下，你可以做一个简单的字符串替换，一旦串建成。

找到这个：

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

并添加.replace('May.', 'May')，像这样：

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

绝对精彩！这像一个魅力。非常感谢！ – BobbyJones

跳过缩写月份名称为月

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