效果如下：

<template>
    <div class="calendar">
      <div class="header">
        <button @click="previousMonth">&lt;</button>
        <h2>{{ currentYear }}-{{ currentMonth }} </h2>
        <button @click="nextMonth">&gt;</button>
      </div>
      <div class="days">
        <div v-for="day in daysOfWeek" :key="day" class="week">{{ day }}</div>
        <div v-for="blank in firstDayOfMonth" :key=" 'black'+blank" class="day"></div>
        <div
          v-for="(date, index) in daysInMonth"
          :key="index"
          class="day"
          :class="{ 'marked-date': isMarkedNowDate(date) }"
        >
          <span :style="{ color: isMarkedDate(date) ? '#73DE07' : 'white' }">{{ date.getDate() }}</span>
        </div>
      </div>
    </div>
  </template>
  
  <script>
  export default {
    name: 'Calendar',
    props: {
    //   markedDates: {
    //     type: Array,
    //     default: () => []
    //   }
    },
    data() {
      return {
        currentDate: new Date(),
        currentYear: '',
        currentMonth: '',
        markedDates: ['2024-06-16', '2024-06-15', '2024-06-01'],
        daysOfWeek: ['日', '一', '二', '三', '四', '五', '六'],
        firstDayOfMonth: 0,
        daysInMonth: []
      };
    },
    
    mounted() {
      this.updateMonthAndYear();
      this.daysInMonths();
      this.firstDayOfMonths();
    },
    methods: {   
      firstDayOfMonths() {
        // getDay() 方法可返回一周（0~6）的某一天的数字。
        // 注意： 星期天为 0, 星期一为 1, 以此类推。
        const firstDay = new Date(this.currentDate.getFullYear(), this.currentDate.getMonth(), 1).getDay();
        this.firstDayOfMonth = firstDay === 0 ? 0 : firstDay; // Adjusting for Sunday being the first day
      },
     daysInMonths() {
        this.daysInMonth = [];
        const firstDay = new Date(this.currentYear, this.currentDate.getMonth(), 1);
        const lastDay = new Date(this.currentYear, this.currentDate.getMonth() + 1, 0);
  
        let currentDay = firstDay;
        while (currentDay <= lastDay) {
          this.daysInMonth.push(new Date(currentDay));
          currentDay.setDate(currentDay.getDate() + 1);
        }
      },
      
      updateMonthAndYear() {
        this.currentYear = this.currentDate.getFullYear();
        this.currentMonth = this.pad(this.currentDate.getMonth() + 1);
      },
      pad(num) {
        return num < 10 ? '0' + num : num;
      },
      isMarkedDate(date) {
        const formattedDate = `${date.getFullYear()}-${this.pad(date.getMonth() + 1)}-${this.pad(date.getDate())}`;
        return this.markedDates.includes(formattedDate);
      },
      isMarkedNowDate(date) {
        const now = new Date();
        const nowDate = `${now.getFullYear()}-${this.pad(now.getMonth() + 1)}-${this.pad(now.getDate())}`;
        const formattedDate = `${date.getFullYear()}-${this.pad(date.getMonth() + 1)}-${this.pad(date.getDate())}`;
        return nowDate==formattedDate;
      },
      previousMonth() {
        this.currentDate.setMonth(this.currentDate.getMonth() - 1);
        this.firstDayOfMonths();
        this.updateMonthAndYear();
        this.daysInMonths()
      },
      nextMonth() {
        this.currentDate.setMonth(this.currentDate.getMonth() + 1);
        this.firstDayOfMonths();
        this.updateMonthAndYear();
        this.daysInMonths()
        
      }
    }
  };
  </script>
  
  <style scoped>
  .calendar {
    width: 4.5455rem;
    padding: .1818rem;
  }
  .header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: .1818rem;
    color: white;
  }
  .days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
  }
  .week {
    padding: .0909rem;
    text-align: center;
    color: #b9c9dd80;
  }
  .day {
    padding: .0909rem;
    text-align: center;
    color: white;
  }
  .marked-date {
    background: #00A6FF;
    border-radius: .0727rem;
  }
  </style>