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js实现日期显示的一些操作(实例讲解)

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1、js获取当前日期(yyyy-mm-dd)

以下代码是获取到的当前日期:

var myDate = new Date(); 
var year = myDate.getFullYear(); //获取完整的年份(4位,1970-????)
var month = myDate.getMonth()+1;  //获取当前月份(1-12)
var day = myDate.getDate();  //获取当前日(1-31)
//获取完整年月日
var newDay = year + “-” + month + “-” + day;

2、点击实现日期的天数加减(yyyy-mm-dd)

点击俩个按钮分别可以实现日期的加减,如果本月天数达到最多,那么月份将会自动增加或减少

var n = 0;
dayChange(0)
$("#time-add").click(function(){
 n++;
 dayChange(n);
})
$("#time-less").click(function(){
 n--;
 dayChange(n);
})
function dayChange(n){
 var now = new Date();//今天
 var tomo = new Date((now/1000+86400*n)*1000);//明天
 var month = tomo.getMonth() + 1;
 var strDate = tomo.getDate(); 
 var seperator1 = "-";
 if (month >= 1 && month <= 9) {
  month = "0" + month;
 }
 if (strDate >= 0 && strDate <= 9) {
  strDate = "0" + strDate;
 }
 var currentdate = tomo.getFullYear() + seperator1 + month + seperator1 + strDate;
 $(".center-day").html(currentdate);
}

3、获取当前本周周一和本周周日的时间范围

不管当前是周几,都可以获取到当前所在这一周的起始时间

var now = new Date();//今天
 week(now); 
 function week(now){
 var nowTime = now.getTime() ; 
 var day = now.getDay();
 var oneDayLong = 24*60*60*1000 ; 
 //获取本周所在周一
 var MondayTime = nowTime - (day-1)*oneDayLong ; 
 //获取本周所在周末     
 var SundayTime = nowTime + (7-day)*oneDayLong ; 
 //转化日期
 var monday = new Date(MondayTime);
 var sunday = new Date(SundayTime);
 var month = monday.getMonth() + 1;
 var strDate = monday.getDate();
 var month1 = sunday.getMonth() + 1;
 var strDate1 = sunday.getDate();
 if (month >= 1 && month <= 9) {
  month = "0" + month;
 }
 if (month1 >= 1 && month1 <= 9) {
  month1 = "0" + month1;
 }
 if (strDate >= 0 && strDate <= 9) {
  strDate = "0" + strDate;
 }
 if (strDate1 >= 0 && strDate1 <= 9) {
  strDate1 = "0" + strDate1;
 }
 currentdate = monday.getFullYear() + seperator1 + month + seperator1 + strDate + "至" + sunday.getFullYear() + seperator1 + month1 + seperator1 + strDate1;
 $(".center-day").html(currentdate);
32}

4、点击实现每周范围的变化

点击改变的按钮将会改变显示一周范围的改变,如果有的在下一月或者下一年,那么将会自动显示,不会出现错误

var now = new Date();//今天
var n = 0;
week(now); 
$("#week-add").click(function(){
 n++;
 var date = new Date(now.getTime() + n*7*24*3600*1000);
 week(date);
})
$("#week-add").click(function(){
 n--;
 var date = new Date(now.getTime() + n*7*24*3600*1000);
 week(date);
})
function week(now){
 var nowTime = now.getTime() ; 
 var day = now.getDay();
 var oneDayLong = 24*60*60*1000 ; 
//获取本周所在周一
 var MondayTime = nowTime - (day-1)*oneDayLong ; 
//获取本周所在周末     
 var SundayTime = nowTime + (7-day)*oneDayLong ; 
22//转化日期
 var monday = new Date(MondayTime);
 var sunday = new Date(SundayTime);
 var month = monday.getMonth() + 1;
 var strDate = monday.getDate();
 var month1 = sunday.getMonth() + 1;
 var strDate1 = sunday.getDate();
 if (month >= 1 && month <= 9) {
  month = "0" + month;
 }
 if (month1 >= 1 && month1 <= 9) {
  month1 = "0" + month1;
 }
 if (strDate >= 0 && strDate <= 9) {
  strDate = "0" + strDate;
 }
 if (strDate1 >= 0 && strDate1 <= 9) {
  strDate1 = "0" + strDate1;
 }
 currentdate = monday.getFullYear() + seperator1 + month + seperator1 + strDate + "至" + sunday.getFullYear() + seperator1 + month1 + seperator1 + strDate1;
 $(".center-day").html(currentdate);
}

5、获取当前月份的第一天和最后一天

能够获取到当前所在月份的第一天和最后一天,最后一天的日期是不固定的,能够获取到应有的日期

monthfen(0)
function monthfen(n){
  var now = new Date();//今天
  var firstDate = new Date((now/1000+86400*n*now.getDate())*1000);//明天
 //本月第一天
  firstDate.setDate(1); //第一天
  var date = new Date(firstDate);
  var month = date.getMonth() + 1;
  var strDate = "0" + date.getDate();
 //本月最后一天
  var endDate = new Date(firstDate);
  endDate.setMonth(firstDate.getMonth()+1);
  endDate.setDate(0);
  var date1 = new Date(endDate);
  var month1 = date1.getMonth() + 1;
  var strDate1 = date1.getDate();
  if (month >= 1 && month <= 9) {
    month = "0" + month;
  }
  if (month1 >= 1 && month1 <= 9) {
    month1 = "0" + month1;
  }
  currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate + "至" + date1.getFullYear() + seperator1 + month1 + seperator1 + strDate1;
  $(".center-day").html(currentdate);
}

6、点击实现当前月份的改变

点击按钮会实现当前月份的改变,那么最后一天的日期也会自动改变,

monthfen(0)
var n = 0;
$("#month-add").click(function(){
 n++;
 monthfen(n);
})
$("#month-less").click(function(){
 n--;
 monthfen(n);
})
function monthfen(n){
  var now = new Date();//今天
  var firstDate = new Date((now/1000+86400*n*now.getDate())*1000);//明天
//本月第一天
  firstDate.setDate(1); //第一天
  var date = new Date(firstDate);
  var month = date.getMonth() + 1;
  var strDate = "0" + date.getDate();
//本月最后一天
  var endDate = new Date(firstDate);
  endDate.setMonth(firstDate.getMonth()+1);
  endDate.setDate(0);
  var date1 = new Date(endDate);
  var month1 = date1.getMonth() + 1;
  var strDate1 = date1.getDate();
  if (month >= 1 && month <= 9) {
    month = "0" + month;
  }
  if (month1 >= 1 && month1 <= 9) {
    month1 = "0" + month1;
  }
  currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate + "至" + date1.getFullYear() + seperator1 + month1 + seperator1 + strDate1;
  $(".center-day").html(currentdate);
}


当然还有很多关于日期格式的改变和算法,如果有什么不理解的可以留下评论,大家一起探讨。

以上这篇js实现日期显示的一些操作(实例讲解)就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。

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