dayjs获取年周数及周时间范围丨技术开发分享录

这是来自一位dayjs访客提的问题，正好有点时间就写了一个解决方案供参考
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>dayjs获取年周数及周时间范围</title>
  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.7.0/vue.min.js"></script>
  <script src="https://unpkg.com/dayjs@1.8.21/dayjs.min.js"></script>
  <script src="https://unpkg.com/dayjs@1.8.21/plugin/weekOfYear.js"></script>
  <script src="https://unpkg.com/dayjs@1.8.21/plugin/isoWeeksInYear.js"></script>
  <script src="https://unpkg.com/dayjs@1.8.21/plugin/isLeapYear.js"></script>
  <style>
    select {
      padding: 6px 10px;
    }
    table {
      margin-top: 10px;
    }
    th,td {
      padding: 6px 10px;
      white-space: nowrap;
    }
  </style>
</head>
<body>
  <div id="js_app">
    <select v-model="year">
      <option v-for="v in years" :value="v">{{ v }}</option>
    </select>
    <table border="1" cellpadding="0" cellspacing="0">
      <thead>
        <tr>
          <th v-for="v in weeks" :key="v">第{{ v }}周</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td v-for="item in weeksTimeRang">
            开始时间：{{ item.startTime }}<br>
            结束时间：{{ item.endTime }}
          </td>
        </tr>
      </tbody>
    </table>
  </div>

  <script>
    dayjs.extend(window.dayjs_plugin_weekOfYear)
    dayjs.extend(window.dayjs_plugin_isoWeeksInYear)
    dayjs.extend(window.dayjs_plugin_isLeapYear)

    var app = new Vue({
      el: '#js_app',
      data() {
        return {
          year: '2019',
          years: ['2019', '2020', '2021', '2022'],
          weeks: 0,
          weeksTimeRang: []
        }
      },
      watch: {
        year() {
          this.assignWeeks();
        }
      },
      methods: {
        assignWeeks() {
          this.weeks = dayjs(this.year).isoWeeksInYear();
          let weeksTimeRang = [];
          for(let i=1; i<=this.weeks; i++) {
            weeksTimeRang.push({
              startTime: dayjs(this.year).week(i).startOf('week').format('YYYY-MM-DD'),
              endTime: dayjs(this.year).week(i).endOf('week').format('YYYY-MM-DD')
            })
          }
          this.weeksTimeRang = weeksTimeRang;
        }
      },
      mounted() {
        this.assignWeeks();
      }
    });
  </script>
</body>
</html>