前端计算两个日期相差几天 , 并把相差的这几天数组输出

我可以为您提供计算两个日期相差几天的代码，代码如下：

function getDateRange(startDate, endDate) {
  var dateArray = new Array();
  var currentDate = startDate;
  while (currentDate <= endDate) {
    dateArray.push(new Date(currentDate));
    currentDate.setDate(currentDate.getDate() + 1);
  }
  return dateArray;
}

function getDaysBetween(startDateString, endDateString) {
  var startDate = new Date(startDateString);
  var endDate = new Date(endDateString);
  var oneDay = 24*60*60*1000;
  var diffDays = Math.round(Math.abs((startDate.getTime() - endDate.getTime())/(oneDay)));
  var dateRange = getDateRange(startDate, endDate);
  var daysArray = dateRange.map(function(date){
    return date.toISOString().slice(0,10);
  });
  return {
    'diffDays': diffDays,
    'daysArray': daysArray
  };
}

您只需调用 `getDaysBetween` 函数，传入两个日期字符串参数即可，例如：

getDaysBetween('2022-01-01', '2022-01-10')

得到输出结果：

{
  "diffDays": 9,
  "daysArray": [
    "2022-01-01",
    "2022-01-02",
    "2022-01-03",
    "2022-01-04",
    "2022-01-05",
    "2022-01-06",
    "2022-01-07",
    "2022-01-08",
    "2022-01-09",
    "2022-01-10"
  ]
}

其中 `diffDays` 表示相差的天数，`daysArray` 表示相差的日期数组。