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20220330_Vote/Ewide.Web.Entry/wwwroot/lib/xe-utils/getDayOfMonth.js

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+var staticDayTime = require('./staticDayTime')
+var staticStrFirst = require('./staticStrFirst')
+var staticStrLast = require('./staticStrLast')
+
+var helperGetDateTime = require('./helperGetDateTime')
+
+var getWhatMonth = require('./getWhatMonth')
+var toStringDate = require('./toStringDate')
+
+var isValidDate = require('./isValidDate')
+
+/**
+  * 返回某个月份的天数
+  *
+  * @param {Date} date 日期或数字
+  * @param {Number} offset 月(默认当月)、前几个月、后几个月
+  * @return {Number}
+  */
+function getDayOfMonth (date, month) {
+  date = toStringDate(date)
+  if (isValidDate(date)) {
+    return Math.floor((helperGetDateTime(getWhatMonth(date, month, staticStrLast)) - helperGetDateTime(getWhatMonth(date, month, staticStrFirst))) / staticDayTime) + 1
+  }
+  return NaN
+}
+
+module.exports = getDayOfMonth