Vue实现万年日历的示例详解

<template>
  <div class="calendar">
    <!-- 年份和日期变化 -->
    <div class="select">
      <span class="select-icon select-sub" @click="changeYear(-1)">《</span>
      <span class="select-icon select-sub select-month" @click="changeMonth(-1)"><</span>
      <span>{{ currentMonth }}</span>
      <span class="select-icon select-add select-month" @click="changeMonth(+1)">></span>
      <span class="select-icon select-add" @click="changeYear(+1)">》</span>
    </div>
    <!-- 日历标题 -->
    <ul class="calendar-header">
      <li v-for="(item, index) in headerData" :key="index" class="calendar-header-item">
        <span>{{ item }}</span>
      </li>
    </ul>
    <!-- 日期内容 -->
    <div class="calendar-box">
      <div class="calendar-box-item" :class="{ delMark: !hasRemarkDays.includes(item) }" v-for="(item, index) in baseDateList" :key="index">
        <!-- 最高层级显示圆形日期 -->
        <div class="item-wrap" :class="{ hasMarked: hasRemarkDays.includes(item) }" @click="toRemark(item, currentDate)">
          <span class="item-date">{{ item ? item : "" }}</span>
          <span class="item-patch" v-if="isShowPatch && !hasRemarkDays.includes(item) && item && item < currentDate">补卡</span>
          <span class="item-current" v-if="currentDate == item"><i></i></span>
          <span class="item-continue" v-if="continueMarkObj.maxDay == item">连续{{ continueMarkObj.maxLen }}天</span>
        </div>
        <!-- 全遮罩背景淡橙色背景 -->
        <span class="all-mark" v-if="hasRemarkDays.includes(item)"></span>
        <!-- 左右遮罩，如果左边无打卡，遮住；如果右边无打卡，遮住 -->
        <span class="left-mark" v-if="index % 7 === 0 || !hasRemarkDays.includes(item - 1)"></span>
        <span class="right-mark" v-if="index % 7 === 6 || !hasRemarkDays.includes(item + 1)"></span>
      </div>
    </div>
  </div>
</template>

  computed: {
    // 返回当前的实际天数，从周一算起
    baseDateList() {
      let date = new Date(this.currentMonth);
      let monthFlag = date.getMonth() + 1;
      let yearFlag = date.getFullYear();
      let currentData = date.getDay();
      let dayLength = new Date(yearFlag, monthFlag, 0).getDate();

      // 周一之前的补0
      let dateBaseData = [];
      for (let i = 0; i < currentData; i++) {
        dateBaseData.push(0);
      }
      // 周一之后的实际填写
      for (let i = 0; i < dayLength; i++) {
        dateBaseData.push(i + 1);
      }

      return dateBaseData;
    },
  }

// 修改年：当type = +1时，表示加一年，为-1时反之
changeYear(type) {
  let time = new Date(this.currentMonth);
  let year = time.getFullYear() + type;
  let month = time.getMonth() + 1;
  this.currentMonth = `${year}-${month}`;
},
// 修改月：当type = -1时，表示加一月，为-1时次之
changeMonth(type) {
  let time = new Date(this.currentMonth);
  let year = time.getFullYear();
  let month = time.getMonth() + 1;
  if (month === 12 && type > 0) { // 12月，并且是加的情况，年加1，月变为1
    year++
    month = 1
  } else if(month === 1 && type < 0) { // 1月，并且是减的情况，年减1，月变为12
    year--
    month = 12
  } else { // 其他情况，直接变化变量type的大小
    month += type
  }
  this.currentMonth = `${year}-${month}`;
},

getMaxDay() {
  let arr = this.hasRemarkDays;
  let buffChild = [];
  let max = [];
  
  for (let i = 0; i < arr.length; i++) {
    // 如果子集不连续了，重新进行赋值和更新
    if (buffChild.length && arr[i] - buffChild[buffChild.length - 1] > 1) {
      max = max.length > buffChild.length ? [...max] : [...buffChild];
      buffChild = [];
      buffChild.push(arr[i]);
      continue;
    }
    // 如果不是，直接进行累计
    buffChild.push(arr[i]);
  }
  return max.length > buffChild.length ? [...max] : [...buffChild];
},