javascript 日期工具汇总

let Utils = {  /**   * 是否为闫年   * @return {Boolse} true|false   */  isLeapYear: function(y) {    return (y % 4 == 0 && y % 100 != 0) || y % 400 == 0;  },  /**   * 返回星期数   * @return {Number}   */  getWhatDay: function(year, month, day) {    let date = new Date(year + '/' + month + '/' + day);    let index = date.getDay();    let dayNames = ['星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六'];    return dayNames[index];  },  /**   * 返回星期数   * @return {Number}   */  getMonthPreDay: function(year, month) {    let date = new Date(year + '/' + month + '/01');    let day = date.getDay();    if (day == 0) {      day = 7;    }    return day;  },  /**   * 返回月份天数   * @return {Number}   */  getMonthDays: function(year, month) {    if (/^0/.test(month)) {      month = month.split('')[1];    }    return [0, 31, this.isLeapYear(year) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];  },  /**   * 补齐数字位数   * @return {string}   */  getNumTwoBit: function(n) {    n = Number(n);    return (n > 9 ? '' : '0') + n;  },  /**   * 日期对象转成字符串   * @return {string}   */  date2Str: function(date, split) {    if (typeof date == 'string') return date;    split = split || '-';    let y = date.getFullYear();    let m = this.getNumTwoBit(date.getMonth() + 1);    let d = this.getNumTwoBit(date.getDate());    return [y, m, d].join(split);  },  /**   * 返回日期格式字符串   * @param {Number} 0返回今天的日期、1返回明天的日期，2返回后天得日期，依次类推   * @return {string} '2014-12-31'   */  getDay: function(i) {    i = i || 0;    let date = new Date();    let diff = i * (1000 * 60 * 60 * 24);    date = new Date(date.getTime() + diff);    return this.date2Str(date);  },  /**   * 时间戳转换为日期格式   * @return {String}   */  timestampToDate: function(timestamp) {    let date = new Date(timestamp);    return date.getFullYear() + '-' + getNumTwoBit(date.getMonth() + 1) + '-' + getNumTwoBit(date.getDate());  },  /**   * 时间比较   * @return {Boolean}   */  compareDate: function(date1, date2) {    let startTime = new Date(date1.replace('-', '/').replace('-', '/'));    let endTime = new Date(date2.replace('-', '/').replace('-', '/'));    if (startTime >= endTime) {      return false;    }    return true;  },  /**   * 时间比较   * @return {Boolean}   */  compareDateArr: function(date1, date2) {    let startTime = new Date();    startTime.setFullYear(parseInt(date1[0]), parseInt(date1[1]) - 1, parseInt(date1[2]));    startTime.setHours(parseInt(date1[3]), parseInt(date1[4]));    let endTime = new Date();    endTime.setFullYear(parseInt(date2[0]), parseInt(date2[1]) - 1, parseInt(date2[2]));    endTime.setHours(parseInt(date2[3]), parseInt(date2[4]));    if (startTime >= endTime) {      return false;    }    return true;  },  /**   * 时间是否相等   * @return {Boolean}   */  isEqual: function(date1, date2) {    let startTime = new Date(date1).getTime();    let endTime = new Date(date2).getTime();    if (startTime == endTime) {      return true;    }    return false;  },  getDateArr(str) {    return [this.getYear(str), this.getMonth(str), this.getDate(str), this.getHour(str), this.getMinute(str)];  },  isDateString(str) {    return //d{4}(/-|//|.)/d{1,2}/1/d{1,2}/.test(str) || /^([01][0-9]|2[0-3])(:[0-5][0-9]){1,2}$/.test(str);  },  getYear(value) {    return this.isDateString(value) ? value.split(' ')[0].split(/-|//|/./)[0] : value.getFullYear();  },  getMonth(value) {    return this.isDateString(value) ? value.split(' ')[0].split(/-|//|/./)[1] : value.getMonth() + 1;  },  getDate(value) {    return this.isDateString(value) ? value.split(' ')[0].split(/-|//|/./)[2] : value.getDate();  },  getHour(value) {    if (this.isDateString(value)) {      const str = value.split(' ')[1] || '00:00:00';      return str.split(':')[0];    }    return value.getHours();  },  getMinute(value) {    if (this.isDateString(value)) {      const str = value.split(' ')[1] || '00:00:00';      return str.split(':')[1];    }    return value.getMinutes();  }};export default Utils;