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angularjs - 仅使用JS获取一周内属于同一月份的天数

问题描述

我想找出属于同一个月的特定周的天数。例如，如果我提供周数和月份，则系统应提供属于给定周但也属于同一月份的总天数。2019 年的第 1 周包含从 12 月 30 日到 1 月 5 日的 7 天。因此，1 月第 1 周的总天数为 5 天。我使用以下代码来获取一周的开始和结束

 Date.prototype.getWeekRange = function() {
  var date = new Date(this.getTime());
  date.setHours(0, 0, 0, 0);
  // Thursday in current week decides the year.
  date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);
  // January 4 is always in week 1.
  var week1 = new Date(date.getFullYear(), 0, 4);
  // Adjust to Thursday in week 1 and count number of weeks from date to week1.
  return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000 - 3 + (week1.getDay() + 6) % 7) / 7);
}

function getDateRangeOfWeek(weekNo, y){
    var d1, numOfdaysPastSinceLastMonday, rangeIsFrom, rangeIsTo;
  var tmpRangeArry = [];
    d1 = new Date(''+y+'');
    numOfdaysPastSinceLastMonday = d1.getDay() - 1;
    d1.setDate(d1.getDate() - numOfdaysPastSinceLastMonday);
    d1.setDate(d1.getDate() + (7 * (weekNo - d1.getWeekRange())));
    rangeIsFrom = (d1.getMonth() + 1) + "-" + d1.getDate() + "-" + d1.getFullYear();
    d1.setDate(d1.getDate() + 6);
    rangeIsTo = (d1.getMonth() + 1) + "-" + d1.getDate() + "-" + d1.getFullYear() ;
    tmpRangeArry.push(rangeIsFrom);
    tmpRangeArry.push(rangeIsTo);
    return tmpRangeArry;
};

但我不知道如何从工作日中删除不同月份的日子

标签： angularjsdate

解决方案

这是您要实现的目标的最小可验证完整算法...在此代码中，一周从星期一开始。

  • 对于周=5 和月=1... 我们得到答案：4（对于 1 月 28 日 - 1 月 31 日）
  • 对于周=5 和月=2... 我们得到答案：3（对于 2 月 1 日 - 2 月 3 日）

下面的工作片段：

var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {

  $scope.myWeek = 1;
  $scope.myMonth = 1;
  $scope.weekStartDate;
  $scope.weekEndDate;
  $scope.numberOfDaysFromThisMonth = 0;

  $scope.getDateRangeOfWeek = function(w, m, y) {
    $scope.numberOfDaysFromThisMonth = 0;
    var d = (1 + (w - 1) * 7); // 1st of January + 7 days for each week
    $scope.weekStartDate = new Date(2019, 0, d);
    $scope.weekEndDate = new Date(2019, $scope.weekStartDate.getMonth(), $scope.weekStartDate.getDate() + 6);

    for (var i = 0; i < 7; i++) {
      let newDate = new Date(2019, $scope.weekStartDate.getMonth(), $scope.weekStartDate.getDate() + i - 1);
      if ($scope.myMonth && newDate.getMonth() + 1 == m) {
        $scope.numberOfDaysFromThisMonth = $scope.numberOfDaysFromThisMonth + 1;
      }
    }
  };

});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>

<div ng-app="myApp" ng-controller="myCtrl">
  Enter the Week of the year in question: <input type="number" ng-model="myWeek"><br/> 
  Enter the Month for which you need the count of days: <input type="number" ng-model="myMonth"><br>
  <br/>
  <button type='button' ng-click="getDateRangeOfWeek(myWeek,myMonth, myYear)"> get date </button>
  <br/><br/>
  <b>Start of week</b>: {{ weekStartDate }} <br/>
  <b>End of week</b>: {{ weekEndDate }} <br/> <br/> # of days for Month:{{ myMonth }} in Week:{{myWeek }} is: <mark>{{ numberOfDaysFromThisMonth }}</mark>
</div>

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