JavaScript實現日期加減計算功能代碼實例，因為在js中沒有類似C#中的AddDays方法，所以要想實現日期加減的話，就需要自己寫函數來實現。這裡分享給大家，有需要的小伙伴可以參考下
項目中需要用到，自己寫了一個。javascript日期按月加減
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <title></title> <script> function dateToDate(date) { var sDate = new Date(); if (typeof date == 'object' && typeof new Date().getMonth == "function" ) { sDate = date; } else if (typeof date == "string") { var arr = date.split('-') if (arr.length == 3) { sDate = new Date(arr[0] + '-' + arr[1] + '-' + arr[2]); } } return sDate; } function addMonth(date, num) { num = parseInt(num); var sDate = dateToDate(date); var sYear = sDate.getFullYear(); var sMonth = sDate.getMonth() + 1; var sDay = sDate.getDate(); var eYear = sYear; var eMonth = sMonth + num; var eDay = sDay; while (eMonth > 12) { eYear++; eMonth -= 12; } var eDate = new Date(eYear, eMonth - 1, eDay); while (eDate.getMonth() != eMonth - 1) { eDay--; eDate = new Date(eYear, eMonth - 1, eDay); } return eDate; } function calcDate() { var d = document.getElementById('date').value; var n = document.getElementById('num').value; var eDate = addMonth(d, n); document.getElementById('result').innerHTML = eDate.getFullYear() + '-' + (eDate.getMonth() + 1) + '-' + eDate.getDate(); } </script> </head> <body> <input type="date" id="date" /> <input type="number" id="num" value="1" /> <input type="button" value="計算" onclick="calcDate()" /> <div id="result"></div> </body> </html>方法二：
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 <script language="javascript"> Date.prototype.Format = function(fmt) { //代碼作者: meizz var o = { "M+" : this.getMonth() + 1, //月份 "d+" : this.getDate(), //日 "h+" : this.getHours(), //小時 "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; } Date.prototype.addDays = function(d) { this.setDate(this.getDate() + d); }; Date.prototype.addWeeks = function(w) { this.addDays(w * 7); }; Date.prototype.addMonths= function(m) { var d = this.getDate(); this.setMonth(this.getMonth() + m); if (this.getDate() < d) this.setDate(0); }; Date.prototype.addYears = function(y) { var m = this.getMonth(); this.setFullYear(this.getFullYear() + y); if (m < this.getMonth()) { this.setDate(0); } }; </script>方法三：
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 <script> function DateAdd(interval,number,date) { /* *--------------- DateAdd(interval,number,date) ----------------- * DateAdd(interval,number,date) * 功能:實現VBScript的DateAdd功能. * 參數:interval,字符串表達式，表示要添加的時間間隔. * 參數:number,數值表達式，表示要添加的時間間隔的個數. * 參數:date,時間對象. * 返回:新的時間對象. * var now = new Date(); * var newDate = DateAdd( "d ",5,now); * author:wanghr100(灰豆寶寶.net) * update:2004-5-28 11:46 *--------------- DateAdd(interval,number,date) ----------------- */ switch(interval) { case "y " : { date.setFullYear(date.getFullYear()+number); return date; break; } case "q " : { date.setMonth(date.getMonth()+number*3); return date; break; } case "m " : { date.setMonth(date.getMonth()+number); return date; break; } case "w " : { date.setDate(date.getDate()+number*7); return date; break; } case "d " : { date.setDate(date.getDate()+number); return date; break; } case "h " : { date.setHours(date.getHours()+number); return date; break; } case "m " : { date.setMinutes(date.getMinutes()+number); return date; break; } case "s " : { date.setSeconds(date.getSeconds()+number); return date; break; } default : { date.setDate(d.getDate()+number); return date; break; } } } var now = new Date(); //加五天. var newDate = DateAdd( "d ",5,now); alert(newDate.toLocaleDateString()) //加兩個月. newDate = DateAdd( "m ",2,now); alert(newDate.toLocaleDateString()) //加一年 newDate = DateAdd( "y ",1,now); alert(newDate.toLocaleDateString()) </script>以上所述就是本文的全部內容了，希望大家能夠喜歡。