JavaScript如何实现时间日期格式转换

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时间日期格式转换

Date.prototype.format = function(formatStr) {
  var str = formatStr;
  var Week = ["日", "一", "二", "三", "四", "五", "六"];
  str = str.replace(/yyyy|YYYY/, this.getFullYear());
  str = str.replace(
    /yy|YY/,
    this.getYear() % 100 > 9
      ? (this.getYear() % 100).toString()
      : "0" + (this.getYear() % 100)
  );
  str = str.replace(
    /MM/,
    this.getMonth() + 1 > 9
      ? (this.getMonth() + 1).toString()
      : "0" + (this.getMonth() + 1)
  );
  str = str.replace(/M/g, this.getMonth() + 1);
  str = str.replace(/w|W/g, Week[this.getDay()]);
  str = str.replace(
    /dd|DD/,
    this.getDate() > 9 ? this.getDate().toString() : "0" + this.getDate()
  );
  str = str.replace(/d|D/g, this.getDate());
  str = str.replace(
    /hh|HH/,
    this.getHours() > 9 ? this.getHours().toString() : "0" + this.getHours()
  );
  str = str.replace(/h|H/g, this.getHours());
  str = str.replace(
    /mm/,
    this.getMinutes() > 9
      ? this.getMinutes().toString()
      : "0" + this.getMinutes()
  );
  str = str.replace(/m/g, this.getMinutes());
  str = str.replace(
    /ss|SS/,
    this.getSeconds() > 9
      ? this.getSeconds().toString()
      : "0" + this.getSeconds()
  );
  str = str.replace(/s|S/g, this.getSeconds());
  return str;
};

// 或
Date.prototype.format = function(format) {
  var o = {
    "M+": this.getMonth() + 1, //month
    "d+": this.getDate(), //day
    "h+": this.getHours(), //hour
    "m+": this.getMinutes(), //minute
    "s+": this.getSeconds(), //second
    "q+": Math.floor((this.getMonth() + 3) / 3), //quarter
    S: this.getMilliseconds() //millisecond
  };
  if (/(y+)/.test(format))
    format = format.replace(
      RegExp.$1,
      (this.getFullYear() + "").substr(4 - RegExp.$1.length)
    );
  for (var k in o) {
    if (new RegExp("(" + k + ")").test(format))
      format = format.replace(
        RegExp.$1,
        RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length)
      );
  }
  return format;
};
alert(new Date().format("yyyy-MM-dd hh:mm:ss"));

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