小程序项目中，获取本周，本月，本季，本年的 第一天和最后一天 废话不多说，上代码
准备阶段JS：
constructor() {
this.now = new Date();
this.nowYear = this.now.getYear(); //当前年
this.nowMonth = this.now.getMonth(); //当前月
this.nowDay = this.now.getDate(); //当前日
this.nowDayOfWeek = this.now.getDay(); //今天是本周的第几天
this.nowYear += (this.nowYear < 2000) ? 1900 : 0;
}
//格式化数字
formatNumber(n) {
n = n.toString()
return n[1] ? n : '0' + n
}
//格式化日期
formatDate(date) {
let myyear = date.getFullYear();
let mymonth = date.getMonth() + 1;
let myweekday = date.getDate();
return [myyear, mymonth, myweekday].map(this.formatNumber).join('-');
}
//获取某月的天数
getMonthDays(myMonth) {
let monthStartDate = new Date(this.nowYear, myMonth, 1);
let monthEndDate = new Date(this.nowYear, myMonth + 1, 1);
let days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
return days;
}
//获取本季度的开始月份
getQuarterStartMonth() {
let startMonth = 0;
if (this.nowMonth < 3) {
startMonth = 0;
}
if (2 < this.nowMonth && this.nowMonth < 6) {
startMonth = 3;
}
if (5 < this.nowMonth && this.nowMonth < 9) {
startMonth = 6;
}
if (this.nowMonth > 8) {
startMonth = 9;
}
return startMonth;
}
时段函数JS：
//获取今天的日期
getNowDate() {
return this.formatDate(new Date(this.nowYear, this.nowMonth, this.nowDay));
}
//获取本周的开始日期
getWeekStartDate() {
return this.formatDate(new Date(this.nowYear, this.nowMonth, this.nowDay - this.nowDayOfWeek + 1));
}
//获取本周的结束日期
getWeekEndDate() {
return this.formatDate(new Date(this.nowYear, this.nowMonth, this.nowDay + (6 - this.nowDayOfWeek + 1)));
}
//获取本月的开始日期
getMonthStartDate() {
return this.formatDate(new Date(this.nowYear, this.nowMonth, 1));
}
//获取本月的结束日期
getMonthEndDate() {
return this.formatDate(new Date(this.nowYear, this.nowMonth, this.getMonthDays(this.nowMonth)));
}
//获取本季度的开始日期
getQuarterStartDate() {
return this.formatDate(new Date(this.nowYear, this.getQuarterStartMonth(), 1));
}
//获取本季度的结束日期
getQuarterEndDate() {
return this.formatDate(new Date(this.nowYear, this.getQuarterStartMonth() + 2, this.getMonthDays(this.getQuarterStartMonth() + 2)));
}
//获取本年的开始日期
getYearStartDate() {
return this.formatDate(new Date(this.nowYear, 0, 1));
}
//获取本年的结束日期
getYearEndDate() {
return this.formatDate(new Date(this.nowYear, 11, 31));
}
使用方法：
1，引入JS：
import { GetPeriod } from '../../utils/getperiod.js'
2,使用JS：
const Getperiod = new GetPeriod()
let startweek = Getperiod.getWeekStartDate() \\ 获取本周第一天
项目地址：
https://github.com/Rattenking/GetPeriod
原文链接：
https://blog.csdn.net/weixin_41871290/article/details/80493882
