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HomeWeb Front-endJS TutorialSample code sharing for encapsulating Date class in javascript

这篇文章主要介绍了javascript-封装Date日期类的相关资料,需要的朋友可以参考下

javascript-封装Date日期类

  (一)对日期进行格式化

  自定义Date日期类的format()格式化方法

    方式一:(非原创)  


// 对Date的扩展,将 Date 转化为指定格式的String
// 月(M)、日(d)、小时(H)、分(m)、秒(s)、季度(q) 可以用 1-2 个占位符, 
// 年(y)可以用 1-4 个占位符,毫秒(S)只能用 1 个占位符(是 1-3 位的数字) 
// 例子: 
// (new Date()).Format("yyyy-MM-dd HH:mm:ss.S") ==> 2016-09-19 16:32:53.731
// (new Date()).Format("yyyy-M-d H:m:s:S")   ==> 2016-9-19 16:40:9:955 
Date.prototype.Format = function (fmt) { //author: meizz 
  var o = {
    "M+": this.getMonth() + 1, //月份 
    "d+": this.getDate(), //日 
    "H+": this.getHours(), //小时 
    "m+": this.getMinutes(), //分 
    "s+": this.getSeconds(), //秒 
    "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
    "S": this.getMilliseconds() //毫秒 
  };
  if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
  for (var k in o)
  if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
  return fmt;
};

    测试:


window.onload=function() {
  var date = new Date();
  var b = date.toLocaleDateString();//获取的格式为:2016年9月19日
  var d = date.toLocaleTimeString();//下午4:42:46
  var e = date.toLocaleString();//2016年9月19日 下午4:44:02
  var f = date.toDateString();//Mon Sep 19 2016
  var g = date.toUTCString();//Mon, 19 Sep 2016 08:45:42 GMT
  var h = date.toString();//Mon Sep 19 2016 16:46:23 GMT+0800 (中国标准时间)
  //自定义日期格式
  var c = date.Format("yyyy-MM-dd HH:mm:ss");//format()方法是自定义的
  document.getElementById("aa").value = c;
};

  (二)根据日期返回本周周一和周日的日期


/**
 * 根据日期返回本周周一和周日的日期
 * @param day
 *   参数日期
 * @param num
 *   第几周
 * @return oneWeek
 *   周一,周日所在日期  
 */
function getWeekDate(day,num) {
  
  num = num || 0;
  // 返回值:周一和周日所在的日期
  var oneWeek = {};
  // 初始日期
  var initDate = "";
  // 截取年月日
  initDate = day.split(' ')[0];
  // ie兼容性问题,将yyyy-MM-dd转换成yyyy/MM/dd
  initDate = initDate.replace(/-/g,"/");
  // 将string转换成Date
  initDate = new Date(Date.parse(initDate));//格式只能是yyyy/MM/dd
  
  // 返回 day距离1970 年 1 月 1 日0时0分的毫秒数
  var nowTime = initDate.getTime(); 
  // 返回星期的某一天的数字: 0(周日) 到 6(周六)
  var weekNum = initDate.getDay();
  // 一天所代表的毫秒数
  var oneDayTime = 24 * 60 * 60 * 1000; 
  
  //显示周一
  var MondayTime = nowTime - (weekNum - 1) * oneDayTime ; 
  //显示周日
  var SundayTime = nowTime + (7 - weekNum) * oneDayTime ; 
  if (0 != num) {
    MondayTime += 7 * num * oneDayTime;
    SundayTime += 7 * num * oneDayTime;
  }
  
  //初始化日期时间
  var monday = new Date(MondayTime);
  var sunday = new Date(SundayTime);
  // formatDate是自定义的格式化方法
  monday = monday.formatDate('yyyy-MM-dd');
  sunday = sunday.formatDate('yyyy-MM-dd');
  
  oneWeek.Monday = monday;
  oneWeek.Sunday = sunday;
  
  return oneWeek;
}

 测试:


var week = getWeekDate('2017-05-27',0);    
console.log(week.Monday + "," + week.Sunday);

 注意:

   Date.parse()具有兼容性问题,低版本IE浏览器不支持"yyyy-MM-dd"转换成Date,只支持"yyyy/MM/dd"转换成日期。

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