基于vue2实现一个日历组件

.Q-calendar-change-enter-active,
.Q-calendar-change-leave-active {
  transition: opacity 0.5s;
}

.Q-calendar-change-enter,
.Q-calendar-change-leave-to
  {
  opacity: 0;
}

.Q-calendar {
  width: 100%;
  height: 100%;
  margin: 0 auto;
  overflow: hidden;
  background-color: #ffffff;
  color: #000;
  user-select: none;
  border: 1px solid #4152b3;

  .Q-calendar-title {
    height: 50px;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    justify-content: space-between;

    div {
      align-self: center;
    }

    .Q-calendar-button,
    .top {
      align-self: center;
    }

    .Q-calendar-title-box {
      width: calc((100% / 7) * 2);
      display: flex;
      justify-content: space-around;
      cursor: default;

      .Q-calendar-title-box-text {
        width: 50%;
        text-align: center;
        align-self: center;
      }
      .Q-calendar-title-box-text:hover {
        color: #4152b3;
        font-weight: 700;
      }
    }
    .Q-calendar-title-box-padding{
      padding-left: 18px;
    }
    .Q-calendar-title-box-center{
      margin: 0 auto;
      font-weight: 700
    }
  }
  .Q-calendar-day {
    height: calc(100% - 50px);
    
    .Q-calendar-week {
      display: flex;
      justify-content: inherit;
      cursor: default;

      p {
        display: flex;
        justify-content: center;
        width: calc(100% / 7);
        box-sizing: border-box;
      }
    }
    
    .Q-calendar-box {
      display: flex;
      justify-content: inherit;
      flex-wrap: wrap;
      width: 100%;
      height: 80%;

      div:hover {
        color: yellowgreen;
        font-weight: 700;
      }

      .Q-calendar-current-month {
        box-sizing: border-box;
        cursor: default;

      }

      .Q-calendar-current-month:hover {
        color: #4152b3;
        font-weight: 700;
        font-size: 20px;
      }

      div {
        display: flex;
        justify-content: center;
        width: calc(100% / 7);
        height: calc(100% / 7);

        span {
          margin: auto;
        }
      }

      p {
        display: flex;
        justify-content: center;
        width: calc(100% / 7);
      }
    }
  }

  .Q-calendar-years {
    height: calc(100% - 50px);

    .Q-calendar-years-box {
      // border: 1px solid pink;
      display: flex;
      justify-content: inherit;
      flex-wrap: wrap;
      height: 98%;

      div {
        display: flex;
        box-sizing: border-box;
        justify-content: center;
        width: calc(100% / 4);
        height: calc(100% / 4);

        span {
          margin: auto;
        }
      }

      div:hover {
        font-weight: 700;
        color: yellowgreen;
      }
    }
  }
}


.Q-calendar-surplus {
  color: #898989;
}

.nowCss {
  // border:1px solid pink;
  background: #f1f3f4;
  color: #40b8ff;
}

.Q-calendar-checked {
  span {
    color: var(--Q-calendar-color);
    background-color: var(--Q-calendar-background-color);
    border-radius: 10px;
    width: 50%;
    height: 50%;
    text-align: center;
    line-height: 24px;
  }
}

import { parseTime } from './formatTime'

export function getRangeDay(startDate, endDate) {
    const result = [];
    const db = new Date();
    db.setUTCFullYear(startDate.year, startDate.month - 1, startDate.day);
    const de = new Date();
    de.setUTCFullYear(endDate.year, endDate.month - 1, endDate.day);
    let smallDate
    let bigDate
    if (db.getTime() > de.getTime()) {
      smallDate = de.getTime()
      bigDate = db.getTime()
    } else {
      smallDate = db.getTime()
      bigDate = de.getTime()
    }
    for (let k = smallDate; k <= bigDate;) {
      result.push({
        year: parseTime(k, "{y}"),
        month: parseTime(k, "{m}").length===1?('0'+parseTime(k, "{m}")):parseTime(k, "{m}"),
        day: parseTime(k, "{d}").length===1?('0'+parseTime(k, "{d}")):parseTime(k, "{d}"),
        checked: true
      });
      k = k + 24 * 60 * 60 * 1000;
    }
    return result;
  }

export function parseTime(time, pattern) {
    if (arguments.length === 0 || !time) return null;
    const format = pattern || '{y}-{m}-{d} {h}:{i}:{s}';
    let date;
    if (typeof time === 'object') {
      date = time;
    } else {
      if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
        time = parseInt(time);
      } else if (typeof time === 'string') {
        time = time.replace(new RegExp(/-/gm), '/');
      }
      if ((typeof time === 'number') && (time.toString().length === 10)) {
        time = time * 1000;
      }
      date = new Date(time);
    }
    const formatObj = {
      y: date.getFullYear(),
      m: date.getMonth() + 1,
      d: date.getDate(),
      h: date.getHours(),
      i: date.getMinutes(),
      s: date.getSeconds(),
      a: date.getDay(),
    };
    return format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
      // @ts-ignore
      let value = formatObj[key];
      // Note: getDay() returns 0 on Sundayday
      if (key === 'a') {
        return ['日', '一', '二', '三', '四', '五', '六'][value];
      }
      if (result.length > 0 && value < 10) {
        value = '0' + value;
      }
      return value || 0;
    });
  }

<template>
  <!-- 外部 -->
  <div class="Q-calendar" @mouseup.stop="onMouseUp" @mouseleave.stop="onMouseleave">
    <!-- 头部 -->
    <div class="Q-calendar-title" v-if="hideTitle">
      <div class="Q-calendar-title-box Q-calendar-title-box-padding">
        <div @click="onClickYears" class="Q-calendar-title-box-text">
          {{ this.currentYear }}年
        </div>
        <div @click="onClickMonth" class="Q-calendar-title-box-text">
          {{ this.currentMonth }}月
        </div>
        <!-- <div>{{this.currentDay}}号</div> -->
      </div>
      <slot name="mkCalendarHeaderSlot"></slot>
      <div class="Q-calendar-title-box" v-if="isSwitch">
        <div class="Q-calendar-title-box-text" @click="onClickUp">上</div>
        <div class="Q-calendar-title-box-text" @click="onClickDown">下</div>
      </div>
    </div>
    <div v-else class="Q-calendar-title">
      <div class="Q-calendar-title-box Q-calendar-title-box-center">
        <div class="Q-calendar-title-box-text">{{ this.currentYear }}年</div>
        <div class="Q-calendar-title-box-text">{{ this.currentMonth }}月</div>
      </div>
    </div>
    <!-- 日历 -->
    <transition name="Q-calendar-change">
      <div class="Q-calendar-day" v-if="hide === 1" @mousewheel="onMousewheel">
        <!-- 周一到周日 -->
        <div class="Q-calendar-week">
          <p v-for="item in isMonday ? weekSort.Monday : weekSort.Sunday" :key="item">{{ item }}</p>
        </div>
        <div class="Q-calendar-box">
          <!-- 上个月剩余天数 -->
          <div class="Q-calendar-surplus" v-for="item in lastMonthDays" :key="'dayLast' + item">
            <span v-show="isOtherDate"> {{ item }}</span>
          </div>
          <!-- 当前月份天数 -->
          <div v-for="item in currentMonthDays" :key="'dayCur' + item.day" class="Q-calendar-current-month"
            :style="cssProps" @click="onChangeDay(item)" :class="{
              'Q-calendar-checked': item.checked,
              nowCss:
              new Date().getFullYear()+'' === item.year &&
              (new Date().getMonth() + 1)+'' === item.month &&
              new Date().getDate()+'' === item.day,
            }" @mouseover="dragDay(item)" @mousedown="onMouseDown(item)">
            <span> {{ item.day}}</span>
          </div>
          <!-- 下月余出 -->
          <div class="Q-calendar-surplus" v-for="item in this.nextMonth()" :key="'dayNext' + item">
            <span v-show="isOtherDate">{{ item }}</span>
          </div>
        </div>
      </div>
    </transition>
    <!-- 月 -->
    <transition name="Q-calendar-change">
      <div class="Q-calendar-years" v-if="hide === 2" @mousewheel="onMousewheel">
        <div class="Q-calendar-years-box">
          <div v-for="item in clickMonth" :key="'monthCur' + item.value" @click="onChangeMonth(item)" :class="{
            nowCss: isNowYear && new Date().getMonth() + 1 === item.value,
          }">
            <span>{{ item.key }}</span>
          </div>
          <div class="Q-calendar-surplus" v-for="item in lastMonth" :key="'monthNext' + item">
            <span>{{ item }}</span>
          </div>
        </div>
      </div>
    </transition>
    <!-- 年 -->
    <transition name="Q-calendar-change">
      <div class="Q-calendar-years Q-calendar-year" v-if="hide === 3" @mousewheel="onMousewheel">
        <div class="Q-calendar-years-box">
          <div class="Q-calendar-surplus" v-for="item in lastYear" :key="'yearLast' + item">
            <span>{{ item }}</span>
          </div>
          <div v-for="item in thisYear" :key="'yearCur' + item" @click="onChangeYear"
            :class="{ nowCss: new Date().getFullYear() === item }">
            <span>{{ item }}</span>
          </div>
        </div>
      </div>
    </transition>
  </div>
</template>
<script>

//  import { parseTime } from "./utils/formatTime";
import { getRangeDay } from "./utils/getRangeDay";
export default {
  name: "QCalendar",
  props: {
    isOtherDate: {
      type: Boolean,
      default: false,
    },
    hideTitle: {
      type: Boolean,
      default: true,
    },
    multiSelect: {
      type: Boolean,
      default: false,
    },
    SelectedBackgroundColor: {
      type: String,
      default: "#4152b3",
    },
    SelectedTextColor: {
      type: String,
      default: "#ffffff",
    },
    isMonday: {
      type: Boolean,
      default: true,
    },
    selectType: {
      type: Number,
      default: 1,
    },
    selectList: {
      type: Array,
      default: () => []
    },
    isSwitch: {
      type: Boolean,
      default: true,
    }
  },
  data() {
    return {
      isMouseDown: false,
      arr: this.selectList,
      isNowYear: true,
      isNowMOnth: true,
      hide: 1,
      weekSort:{
        Sunday: ["日", "一", "二", "三", "四", "五", "六"],
        Monday: ["一", "二", "三", "四", "五", "六", "日"],
      },
      clickMonth: [
        { key: "一月", value: 1 },
        { key: "二月", value: 2 },
        { key: "三月", value: 3 },
        { key: "四月", value: 4 },
        { key: "五月", value: 5 },
        { key: "六月", value: 6 },
        { key: "七月", value: 7 },
        { key: "八月", value: 8 },
        { key: "九月", value: 9 },
        { key: "十月", value: 10 },
        { key: "十一月", value: 11 },
        { key: "十二月", value: 12 },
      ],
      lastMonth: ["一月", "二月", "三月", "四月"],
      lastYear: [],
      thisYear: [],
      // 当前日
      currentDay: new Date().getDate(),
      // 当前月
      currentMonth: new Date().getMonth() + 1,
      // 当前年
      currentYear: new Date().getFullYear(),
    };
  },
  created() {
    this.initParameter();
  },
  computed: {
    cssProps() {
      return {
        "--Q-calendar-background-color": this.SelectedBackgroundColor,
        "--Q-calendar-color": this.SelectedTextColor,
      };
    },
    // 当前月的天数
    currentMonthDays() {
      let dayLength = new Date(
        this.currentYear,
        this.currentMonth,
        0
      ).getDate();
      let arr = [];
      for (let h = 0; h < dayLength; h++) {
        let dataObj = {
          year: this.currentYear + "",
          month: (this.currentMonth>0&&this.currentMonth<10)?'0'+ this.currentMonth :this.currentMonth+'',
          day: (h+1>0&&h+1<10)? '0'+ (h+1) : (h+1) + '',
          checked: false,
        };
        arr[h] = dataObj;
      }
      for (let p = 0; p < this.arr.length; p++) {
        for (let k = 0; k < arr.length; k++) {
          if ((this.arr[p].year === arr[k].year + "") && (this.arr[p].month === arr[k].month + "") && (this.arr[p].day === arr[k].day + "") && this.arr[p].checked) {
            arr[k].checked = true
          }
        }
      }
      return arr;
    },
    // 获取上个月的剩余多少天
    lastMonthDays() {
      const lastLength = new Date(
        this.currentYear,
        this.currentMonth - 1,
        0
      ).getDate();
      let cutLength;
      if (this.isMonday) {
        cutLength = new Date(
          this.currentYear,
          this.currentMonth - 1,
          0
        ).getDay();
      } else {
        cutLength = new Date(
          this.currentYear,
          this.currentMonth - 1,
          1
        ).getDay();
      }
      let arr = [];
      for (let h = lastLength - cutLength + 1; h <= lastLength; h++) {
        arr.push(h);
      }
      return arr;
    },
  },
  methods: {
    onMousewheel(e) {
      let evt = e || window.event; //考虑兼容性
      evt.preventDefault();
      if (evt.deltaY > 0) {
        this.onClickDown();
      } else {
        this.onClickUp();
      }
      //检查事件
      // console.log(evt.type, evt.deltaX, evt.deltaY, evt.deltaZ);
    },
    dragDay(dayObj) {
      if (!this.multiSelect) {
        return;
      } else {
        if (!this.isMouseDown) {
          return;
        } else {
          this.onChangeDay(dayObj);
        }
      }
    },
    onMouseDown(dayObj) {
      if (!this.multiSelect) {
        return;
      } else {
        if (this.isMouseDown) this.onChangeDay(dayObj);
        this.isMouseDown = true;
      }
    },
    onMouseUp() {
      this.isMouseDown = false;
    },
    onMouseleave() {
      if (this.isMouseDown) {
        this.isMouseDown = false;
      }
    },
    // 点击多选
    onChangeDay(val) {
      // 判断单选，多选，还是范围选，对应值1.2.3.
      if (this.selectType === 1) {
        if (this.arr.length === 0) {
          val.checked = true;
          this.arr=[val]
        } else if (this.arr.length === 1) {
          if ((this.arr[0].year === val.year) && (this.arr[0].month === val.month) && (this.arr[0].day === val.day)) {
            this.arr = []
          } else {
            this.arr = []
            val.checked = true;
            this.arr.push(val);
          }
        } else {
          return
        }
      } else if (this.selectType === 2) {
        if (val.checked) {
          // 剔除
          val.checked = false;
          this.arr = this.arr.filter((ele) => {
            return !(
              ele.year === val.year &&
              ele.month === val.month &&
              ele.day === val.day
            );
          });
        } else {
          // 添加
          val.checked = true;
          this.arr.push(val);
        }
      } else if (this.selectType === 3) {
        // 范围选择，
        if (this.arr.length === 0) {
          val.checked = true;
          this.arr.push(val);
        } else if (this.arr.length === 1) {
          val.checked = true;
          this.arr.push(val);
          const arrS = getRangeDay(this.arr[0],this.arr[1])
          this.arr = []
          this.arr = arrS
        } else {
          this.arr = []
          val.checked = true;
          this.arr.push(val);
        }
      }
      this.$emit("selectedData", this.arr);
    },
    initParameter() {
      let currentYear = this.currentYear - 1;
      for (let p = 3; p >= 0; p--) {
        this.lastYear[p] = currentYear--;
      }
      currentYear = this.currentYear;
      for (let l = 0; l < 12; l++) {
        this.thisYear[l] = currentYear++;
      }
    },
    onChangeYear(val) {
      this.hide = 2;
      let currentYear = new Date().getFullYear();
      this.currentYear = val.class="lazy" data-srcElement.innerText;
      this.isNowYear = val.class="lazy" data-srcElement.innerText + "" === currentYear+''
    },
    onChangeMonth(val, ) {
      this.hide = 1;
      let currentMonth = new Date().getMonth() + 1;
      this.currentMonth = val.value;
      this.isNowMOnth=val.value + "" === currentMonth + ""
    },
    // 点击年
    onClickYears() {
      let currentYear = this.currentYear - 1;
      for (let p = 3; p >= 0; p--) {
        this.lastYear[p] = currentYear--;
      }
      this.hide = 3;
    },
    // 点击月
    onClickMonth() {
      this.hide = 2;
    },
    // 获取上个月的剩余多少天
    nextMonth() {
      const ac = 42 - this.currentMonthDays.length - this.lastMonthDays.length;
      return ac;
    },
    // 上
    onClickUp() {
      let currentYear = new Date().getFullYear();
      if (this.hide === 1) {
        if (this.currentMonth === 1) {
          this.currentYear--, (this.currentMonth = 13);
        }
        this.currentMonth--;
      } else if (this.hide === 2) {
        this.currentYear--;
        this.isNowYear = this.currentYear+'' === currentYear+''
      } else {
        this.switchingYear(1);
      }
    },
    // 下
    onClickDown() {
      let currentYear = new Date().getFullYear();
      if (this.hide === 1) {
        // 日
        if (this.currentMonth === 12) {
          this.currentYear++, (this.currentMonth = 0);
        }
        this.currentMonth++;
      } else if (this.hide === 2) {
        // 月默认切换年
        this.currentYear++;
        this.isNowYear = this.currentYear+'' === currentYear+''
      } else {
        // 切换年的选择
        this.switchingYear(2);
      }
    },
    switchingYear(type) {
      // 1上，2下
      if (type === 1) {
        // last最后一个为this的最后一个
        let thisAnchor = this.lastYear[3] - 11;
        let lastAnchor = this.lastYear[3] - 15;
        this.thisYear = [];
        for (let p = 0; p < 12; p++) {
          this.thisYear[p] = thisAnchor++;
        }
        this.lastYear = [];
        for (let l = 0; l < 4; l++) {
          this.lastYear[l] = lastAnchor++;
        }
      } else if (type === 2) {
        let anchor = this.thisYear[11] + 1;
        this.lastYear = [];
        for (let p = 3; p >= 0; p--) {
          this.lastYear[p] = this.thisYear[11]--;
        }
        this.thisYear = [];
        for (let l = 0; l < 12; l++) {
          this.thisYear[l] = anchor++;
        }
      }
    },
  },
};
</script>

<style scoped lang="scss">
@import './utils/QCalendar.scss';
</style>