一、js实现获取今日、本周、本月、本学期的开始结束日期
getDateFn.js 今日、本周、本月，实现是参考他人资源！
<template><div> </div></template><script>import getDateFn from '@/utils/getDateFn'export default {created() {console.log('今日日期',getDateFn.getDate());console.log('本周开始日期',getDateFn.getMonday('s'));console.log('本周结束日期',getDateFn.getMonday('e'));console.log('本月开始日期',getDateFn.getMonth('s',0));console.log('本月结束日期',getDateFn.getMonth('e',0));console.log('本学期开始日期',getDateFn.getTerm('s',new Date().getMonth() + 1));console.log('本学期结束日期',getDateFn.getTerm('e',new Date().getMonth() + 1));}}
getDateFn.js
const getDateFn ={//1、 得到今天、昨天、明天日期//dates为数字类型，0代表今日,-1代表昨日，1代表明日，返回yyyy-mm-dd格式字符串，dates不传默认代表今日。getDate(dates) {var dd = new Date();var n = dates || 0;dd.setDate(dd.getDate() + n);var y = dd.getFullYear();var m = dd.getMonth() + 1;var d = dd.getDate();m = m < 10 ? "0" + m: m;d = d < 10 ? "0" + d: d;var day = y + "-" + m + "-" + d;return day;},//2、得到本周、上周、下周的起始、结束日期//type为字符串类型，有两种选择，"s"代表开始,"e"代表结束，dates为数字类型，不传或0代表本周，-1代表上getMonday(type, dates) {var now = new Date();var nowTime = now.getTime();var day = now.getDay();var longTime = 24 * 60 * 60 * 1000;var n = longTime * 7 * (dates || 0);if (type == "s") {var dd = nowTime - (day - 1) * longTime + n;};if (type == "e") {var dd = nowTime + (7 - day) * longTime + n;};dd = new Date(dd);var y = dd.getFullYear();var m = dd.getMonth() + 1;var d = dd.getDate();m = m < 10 ? "0" + m: m;d = d < 10 ? "0" + d: d;var day = y + "-" + m + "-" + d;return day;},//3、得到本月、上月、下月的起始、结束日期//type为字符串类型，有两种选择，"s"代表开始,"e"代表结束，months为数字类型，0代表本月，-1代表上月，1代表下月getMonth(type, months) {var d = new Date();var year = d.getFullYear();var month = d.getMonth() + 1;if (Math.abs(months) > 12) {months = months % 12;};if (months != 0) {if (month + months > 12) {year++;month = (month + months) % 12;} else if (month + months < 1) {year--;month = 12 + month + months;} else {month = month + months;};};month = month < 10 ? "0" + month: month;var date = d.getDate();var firstday = year + "-" + month + "-" + "01";var lastday = "";if (month == "01" || month == "03" || month == "05" || month == "07" || month == "08" || month == "10" || month == "12") {lastday = year + "-" + month + "-" + 31;} else if (month == "02") {if ((year % 4 == 0 && year % 100 != 0) || (year % 100 == 0 && year % 400 == 0)) {lastday = year + "-" + month + "-" + 29;} else {lastday = year + "-" + month + "-" + 28;};} else {lastday = year + "-" + month + "-" + 30;};var day = "";if (type == "s") {day = firstday;} else {day = lastday;};return day;},//4、得到今年、去年、明年的开始、结束日期//type为字符串类型，有两种选择，"s"代表开始,"e"代表结束，dates为数字类型，不传或0代表今年，-1代表去年，1代表明年getYear(type, dates) {var dd = new Date();var n = dates || 0;var year = dd.getFullYear() + Number(n);if (type == "s") {var day = year + "-01-01";};if (type == "e") {var day = year + "-12-31";};if (!type) {var day = year + "-01-01/" + year + "-12-31";};return day;},//5、得到本学期: //"s"代表开始,"e"代表结束，dates为数字类型，2-8月份为下学期getTerm(type,dates){let nowYear = new Date().getFullYear();let prevYear = new Date().getFullYear() - 1;let nextYear = new Date().getFullYear() + 1;if(type === 's'){if(dates < 2){return prevYear+"-09-01";}else if (dates > 8){return nowYear+"-09-01";}else{return nowYear+"-02-01";}}if(type === 'e'){if(dates < 2){return nowYear+"-01-31";}else if (dates > 8){return nextYear+"-01-31";}else{return nowYear+"-08-31";}}} }export default getDateFn;
