Question

我有一个充满不同日子的数组：

ngOnInit() {               
  this.merchantService.getList().subscribe(res => {
    console.log("The response is", res); 
  });
}

我如何检测到距今天最近的日子是哪一天？

我的当前状态可以检测到，如果明天是数组的一部分，但是我不知道如何在明天不存在的情况下获得最近的一天。

let days = ["2018-09-02", "2018-10-06", "2018-10-12", "2018-10-24", "2018-11-02", "2018-11-04"];

Answer 1

假设数组已排序，则可以执行以下操作：

let days = ["2018-09-02", "2018-10-06", "2018-10-12", "2018-10-24", "2018-11-02", "2018-11-04"];
let today = moment().format('YYYY-MM-DD');
console.log(days.find(d => d > today));

<script src="https://cdn.jsdelivr.net/npm/moment@2.19.3/moment.min.js"></script>

Answer 2

一种可能性是从当前日期中减去每个日期，并查看距正数天数最少的日期。

示例：

let days = ["2018-09-02", "2018-10-06", "2018-10-12", "2018-10-30", "2018-11-02", "2018-11-04", "2019-01-01"];
let curDay = moment().format('YYYY-MM-DD');
let closestDay;
let closestDiff;
for (let i = 0; i < days.length; i++) {
  let diff = moment(days[i]).diff(curDay, 'days'); 
  if(diff > 0){
    if(closestDiff === undefined) {
      closestDay = days[i];
      closestDiff = diff;
    } else if(diff < closestDiff) {
      closestDay = days[i];
      closestDiff = diff;
    }
  }
}
if(closestDay === undefined) closestDay = "no days found in the future";
document.getElementById("closest-future").innerHTML = closestDay;

<!DOCTYPE html>
<html>

  <head>
    <script data-require="moment.js@2.14.1" data-semver="2.14.1" src="https://npmcdn.com/moment@2.14.1"></script>
  </head>

  <body>
    <div>Shortest date in the future is: <span id='closest-future'></span></div>
  </body>

</html>

moment.js-获取数组的下一个现有日期

2 个答案: