Question

我将从日历中选择日期范围说例如我将从 6月6日到7月26日选择日期范围。我需要计算星期二和星期四的数量< / strong>在所选范围内

Answer 1

您可以使用时刻库（http://momentjs.com轻松完成此操作，您可以使用 npm安装时刻将其添加到项目中，然后将其导入到您需要的组件中。）

  countDays = () => {
    let { date1, date2 } = this.state;
    let tuesdays = 0,
      thursdays = 0;

    date1 = moment(date1);
    date2 = moment(date2);
    let fromDayWeek = date1.isoWeeks();
    let toDayWeek = date2.isoWeeks();
    let fromDay = date1.isoWeekday();
    let toDay = date2.isoWeekday();
    let weekIteration = toDayWeek - fromDayWeek;
    let j = 1,
      daysOfWeek = 7;

    for (let i = 0; i <= weekIteration; i++) {
      // iterating throught days - first day = 1 = monday, last day = 7 = sunday
      j = i === 0 ? fromDay : 1; // we want to start counting for the first selected date
      daysOfWeek = i === weekIteration - 1 ? toDay : 7; // we want to end counting for the last selected date

      for (j; j <= daysOfWeek; j++) {
        // if it's tuesday, it is 2 day of week
        if (j === 2) {
          tuesdays++;
        }
        // if it's thursday, it is 4 day of week
        if (j === 4) {
          thursdays++;
        }
      }
    }

    return {
      tuesdays,
      thursdays
    };
  };

请点击此处查看完整的解决方案： https://codesandbox.io/s/x2w6nq6npq

Answer 2

然而，这可以简化，但这是最简单的方法。

我假设您有范围的Datepickers，例如假设 -

<input type="date" name="from"/>
<input type="date" name="to"/>

现在我们从输入中获取日期作为值并循环通过 -

var days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
    tuesdays=[],
    mondays=[];

$('button').click(function(){
var startDate = new Date($('input[name="from"]').val()),
    endDate =  new Date($('input[name="to"]').val());

  while(startDate <= endDate){

    var dayName = days[new Date(startDate).getDay()];

    if(dayName==="Monday"){
       mondays.push(new Date(startDate));
    }

    if(dayName ==="Tuesday"){
      tuesdays.push(new Date(startDate));
    }

    startDate = new Date(startDate).setDate(new Date(startDate).getDate() + 1); 
  }
});

浏览开始日期和结束日期并获取日期名称。

看看我为你做的这个小提琴 - http://jsfiddle.net/xpvt214o/220346/

P.S。如果需要，请确保将StartDate的验证低于EndDate和其他人。这只是一个从它开始的例子。

如何使用reactjs计算所选日期范围内的周二数？

2 个答案: