Vue에서 달력 기능을 구현하는 방법

<template>
  <div class="calendar">
    <div class="header">
      <button @click="prevMonth">&larr;</button>
      <h2>{{ currentMonth }}</h2>
      <button @click="nextMonth">&rarr;</button>
    </div>
    <div class="days">
      <div v-for="day in days" :key="day">{{ day }}</div>
    </div>
    <div class="dates">
      <div v-for="date in visibleDates" :key="date">{{ date }}</div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      currentMonth: '',
      days: [],
      visibleDates: []
    };
  },
  mounted() {
    this.initCalendar();
  },
  methods: {
    initCalendar() {
      const now = new Date();
      const year = now.getFullYear();
      const month = now.getMonth();
      this.currentMonth = `${year}-${month + 1}`;

      const firstDay = new Date(year, month, 1).getDay();
      const lastDay = new Date(year, month + 1, 0).getDate();

      this.days = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
      this.visibleDates = Array(firstDay).fill('').concat(Array.from({ length: lastDay }, (_, i) => i + 1));
    },
    prevMonth() {
      const [year, month] = this.currentMonth.split('-').map(Number);
      const prevMonth = month === 1 ? 12 : month - 1;
      const prevYear = month === 1 ? year - 1 : year;

      this.currentMonth = `${prevYear}-${prevMonth}`;
      this.updateVisibleDates();
    },
    nextMonth() {
      const [year, month] = this.currentMonth.split('-').map(Number);
      const nextMonth = month === 12 ? 1 : month + 1;
      const nextYear = month === 12 ? year + 1 : year;

      this.currentMonth = `${nextYear}-${nextMonth}`;
      this.updateVisibleDates();
    },
    updateVisibleDates() {
      const [year, month] = this.currentMonth.split('-').map(Number);
      const firstDay = new Date(year, month - 1, 1).getDay();
      const lastDay = new Date(year, month, 0).getDate();

      this.visibleDates = Array(firstDay).fill('').concat(Array.from({ length: lastDay }, (_, i) => i + 1));
    }
  }
};
</script>

<style scoped>
.calendar {
  width: 400px;
  margin: 0 auto;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}

.dates {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}
</style>