发布于 2016-12-03 10:17:25 | 193 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Javascript教程,程序狗速度看过来!

JavaScript客户端脚本语言

Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如Perl,遗留的速度问题,为客户提供更流畅的浏览效果。


这篇文章主要介绍了JavaScript通过Date-Mask将日期转换成字符串的方法,涉及javascript日期、数组及字符串操作的相关技巧,需要的朋友可以参考下

本文实例讲述了JavaScript通过Date-Mask将日期转换成字符串的方法。分享给大家供大家参考。具体实现方法如下:


var MonthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
var DayNames = [ "Sunday", "Monday", "Tueday", "Wednesday", "Thursday", 
  "Friday", "Saturday" ];
var ShortMths = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", 
  "Sep", "Oct", "Nov", "Dec"];
var ShortDays = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
var StringToDate = function (sDate, sFormat, cutOff) {
  // Input: a date value as a string, it's format as a string e.g. 'dd-mmm-yy'
  // Optional: a cutoff (integer) for 2 digit years.
  // If no 'd' appears in the format string then the 1st of the month is assumed.
  // If the year is 20 and the cut-off is 30 then the value will be converted 
  // to 2020; if the year is 40 then this will be converted to 1940.
  // If no cut-off is supplied then '20' will be pre-pended to the year (YY).
  // Output: a string in the format 'YYYY/MM/DD' or ''
  // Will not attempt to convert certain combinations e.g. DMM, MDD, DDM, YYYYD.
  var sParsed, fndSingle;
  // sParsed will be constructed in the format 'YYYY/MM/DD'
  sDate = sDate.toString().toUpperCase();
  sFormat = sFormat.toUpperCase();
  if (sFormat.search(/MMMM|MMM/) + 1) { // replace Mar/March with 03, etc.
    sDate = sDate.replace(new RegExp('(' + ShortMths.join('|') + ')[A-Z]*', 'gi'),
      function (m) {
      var i = ShortMths.indexOf(m.charAt(0).toUpperCase() + 
        m.substr(1, 2).toLowerCase()) + 1;
      return ((i < 10) ? "0" + i : "" + i).toString();
    });
    sFormat = sFormat.replace(/MMMM|MMM/g, 'MM');
  }
  if (sFormat.search(/DDDD|DDD/) + 1) { // replace Tue/Tuesday, etc. with ''
    sDate = sDate.replace(new RegExp('(' + ShortDays.join('|') + ')[A-Z]*', 'gi'),'');
    sFormat = sFormat.replace(/DDDD|DDD/g, '');
  }
  sDate = sDate.replace(/(^|\D)(\d)(?=\D|$)/g, function($0, $1, $2) {
    // single digits 2 with 02
    return $1 + '0' + $2;
  });
  sFormat = sFormat.replace(/(^|[^DMY])(D|M)(?=[^DMY]|$)/g, function($0, $1, $2){
    return $1 + $2 + $2; // replace D or M with DD and MM
  });
  // are there still single Ds or Ms?
  fndSingle = sFormat.search(/(^|[^D])D([^D]|$)|(^|[^M])M([^M]|$)/)+1;
  // do not attempt to parse, for example, 'DMM'
  if ( fndSingle ) return '';
  sFormat = sFormat.replace(/(^|[^Y])(YY)(?=[^Y]|$)/g, function($0, $1, $2, index) {
    var tempDate = sDate.substr(0, index + 1);
    tempDate += (cutOff) ? ((parseInt(sDate.substr(index + 1, 2),10) > cutOff) ? '19' : '20') : '20';
    tempDate += sDate.substr(index + 1);
    sDate = tempDate;
    return $1 + $2 + $2;
  });
  sParsed = ('YYYY/MM/DD').replace(/YYYY|MM|DD/g, function(m){
    return (sFormat.indexOf(m) + 1) ? 
      sDate.substr(sFormat.indexOf(m), m.length) : '';
  });
  if (sParsed.charAt(0) == '/') {
    // if no year specified, assume the current year
    sParsed = (new Date().getFullYear()) + sParsed;
  }
  if (sParsed.charAt(sParsed.length - 1) == '/') {
    // if no date, assume the 1st of the month
    sParsed += '01';
  }
  // should end up with 10 characters..
  return ( sParsed.length == 10 ) ? sParsed : '';
};

希望本文所述对大家的javascript程序设计有所帮助。



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