var now = new Date(); //当前日期
var nowDayOfWeek = now.getDay(); //今天本周的第几天
var nowDay = now.getDate(); //当前日
var nowMonth = now.getMonth(); //当前月
var nowYear = now.getFullYear(); //当前年

//获得本周的开端日期
function getWeekStartDate() {
let weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);
return formatDate(weekStartDate);
}
//获得本周的停止日期
function getWeekEndDate() {
let weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));
return formatDate(weekEndDate);
}
//获得上周的开端日期
function getBeforeWeekStartDate() {
let weekStartDate = new Date(nowYear, nowMonth, nowDay - 7 - nowDayOfWeek);
return formatDate(weekStartDate);
}
//获得上周的停止日期
function getBeforeWeekEndDate() {
let weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek - 7));
return formatDate(weekEndDate);
}
//获得本月的开端日期
function getMonthStartDate() {
let monthStartDate = new Date(nowYear, nowMonth, 1);
return formatDate(monthStartDate);
}
//获得本月的停止日期
function getMonthEndDate() {
let monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));
return formatDate(monthEndDate);
}
//获得上月开端时候
function getLastMonthStartDate() {
let lastMonthStartDate = new Date(new Date().getFullYear(), new Date().getMonth() - 1, 1)
return formatDate(lastMonthStartDate);
}
//获得上月停止时候
function getLastMonthEndDate() {
var date = new Date();
var day = new Date(date.getFullYear(), date.getMonth(), 0).getDate();
var lastMonthEndDate = new Date(new Date().getFullYear(), new Date().getMonth() - 1, day);
return formatDate(lastMonthEndDate);
}
//获得某月的天数
function getMonthDays(myMonth){
let monthStartDate = new Date(nowYear, myMonth, 1);
let monthEndDate = new Date(nowYear, myMonth + 1, 1);
let days = (monthEndDate - monthStartDate)/(1000 * 60 * 60 * 24);
return days;
}
//字段拼接
function substrDataStr(data) {
let strArr = [];
strArr.push(data.substr(0, 4))
strArr.push(data.substr(4, 2))
strArr.push(data.substr(6, 2))
return strArr
}
//格局化日期：yyyy-MM-dd
function formatDate(date) {
let myyear = date.getFullYear();
let mymonth = date.getMonth() + 1;
let myweekday = date.getDate();
if (mymonth < 10) {
mymonth = "0" + mymonth;
}
if (myweekday < 10) {
myweekday = "0" + myweekday;
}
return (myyear + "" + mymonth + "" + myweekday);
}
//获取今天之前的多少天的日期
function GetDateStr(AddDayCount) {
let dd = new Date();
dd.setDate(dd.getDate() + AddDayCount); //获取AddDayCount天后的日期
let y = dd.getFullYear();
let m = dd.getMonth() + 1; //获取当前月份的日期
let d = dd.getDate();
if (m < 10) {
m = "0" + m;
}
if (d < 10) {
d = "0" + d;
}
return y + "" + m + "" + d;
}

export default {
getWeekStartDate,
getWeekEndDate,
getBeforeWeekStartDate,
getBeforeWeekEndDate,
getMonthStartDate,
getMonthEndDate,
getLastMonthStartDate,
getLastMonthEndDate,
substrDataStr,
formatDate,
GetDateStr
}