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

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+var setupDefaults = require('./setupDefaults')
+
+var staticDayTime = require('./staticDayTime')
+var staticWeekTime = require('./staticWeekTime')
+
+var helperGetDateTime = require('./helperGetDateTime')
+
+var toStringDate = require('./toStringDate')
+
+var isValidDate = require('./isValidDate')
+var isNumber = require('./isNumber')
+
+/**
+  * 返回前几周或后几周的星期几
+  *
+  * @param {Date} date 日期
+  * @param {Number} offsetWeek 周(默认当前周)、前几周、后几周
+  * @param {Number} offsetDay 星期天(默认0)、星期一(1)、星期二(2)、星期三(3)、星期四(4)、星期五(5)、星期六(6)
+  * @param {Number} firstDay 周视图的起始天，默认星期一
+  * @return {Date}
+  */
+function getWhatWeek (date, offsetWeek, offsetDay, firstDay) {
+  date = toStringDate(date)
+  if (isValidDate(date)) {
+    var hasCustomDay = isNumber(offsetDay)
+    var hasStartDay = isNumber(firstDay)
+    var whatDayTime = helperGetDateTime(date)
+    // 如果指定了天或周视图起始天
+    if (hasCustomDay || hasStartDay) {
+      var viewStartDay = hasStartDay ? firstDay : setupDefaults.firstDayOfWeek
+      var currentDay = date.getDay()
+      var customDay = hasCustomDay ? offsetDay : currentDay
+      if (currentDay !== customDay) {
+        var offsetNum = 0
+        if (viewStartDay > currentDay) {
+          offsetNum = -(7 - viewStartDay + currentDay)
+        } else if (viewStartDay < currentDay) {
+          offsetNum = viewStartDay - currentDay
+        }
+        if (customDay > viewStartDay) {
+          whatDayTime += ((customDay === 0 ? 7 : customDay) - viewStartDay + offsetNum) * staticDayTime
+        } else if (customDay < viewStartDay) {
+          whatDayTime += (7 - viewStartDay + customDay + offsetNum) * staticDayTime
+        } else {
+          whatDayTime += offsetNum * staticDayTime
+        }
+      }
+    }
+    if (offsetWeek && !isNaN(offsetWeek)) {
+      whatDayTime += offsetWeek * staticWeekTime
+    }
+    return new Date(whatDayTime)
+  }
+  return date
+}
+
+module.exports = getWhatWeek