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46 lines
1.7 KiB
46 lines
1.7 KiB
5 months ago
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var staticStrFirst = require('./staticStrFirst')
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var staticStrLast = require('./staticStrLast')
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var staticDayTime = require('./staticDayTime')
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var helperGetDateFullYear = require('./helperGetDateFullYear')
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var helperGetDateTime = require('./helperGetDateTime')
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var helperGetDateMonth = require('./helperGetDateMonth')
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var toStringDate = require('./toStringDate')
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var isValidDate = require('./isValidDate')
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var isNumber = require('./isNumber')
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/**
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* 返回前几月或后几月的日期
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*
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* @param {Date} date 日期或数字
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* @param {Number} offsetMonth 月(默认当前月)、前几个月、后几个月
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* @param {Number/String} offsetDay 获取哪天：月初(first)、月末(last)、指定天数(数值)，如果为空，但超过指定月份的天数时，则默认单月最后一天
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* @return {Date}
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*/
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function getWhatMonth (date, offsetMonth, offsetDay) {
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var monthNum = offsetMonth && !isNaN(offsetMonth) ? offsetMonth : 0
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date = toStringDate(date)
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if (isValidDate(date)) {
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if (offsetDay === staticStrFirst) {
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return new Date(helperGetDateFullYear(date), helperGetDateMonth(date) + monthNum, 1)
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} else if (offsetDay === staticStrLast) {
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return new Date(helperGetDateTime(getWhatMonth(date, monthNum + 1, staticStrFirst)) - 1)
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} else if (isNumber(offsetDay)) {
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date.setDate(offsetDay)
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}
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if (monthNum) {
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var currDate = date.getDate()
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date.setMonth(helperGetDateMonth(date) + monthNum)
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if (currDate !== date.getDate()) {
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// 当为指定天数，且被跨月了，则默认单月最后一天
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date.setDate(1)
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return new Date(helperGetDateTime(date) - staticDayTime)
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}
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}
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}
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return date
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}
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module.exports = getWhatMonth
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