Vue 사용자 정의 달력 구성 요소를 캡슐화하는 방법에 대한 심층 분석

<script setup>
import { reactive, ref, computed, watch } from "vue";

const props = defineProps({
  modelValue: Date,
});

const emits = defineEmits(["update:modelValue"]);

/**
 * 最小年份
 */
const MIN_YEAR = 1900;
/**
 * 最大年份
 */
const MAX_YEAR = 9999;

/**
 * 目标日期
 */
const targetDate = ref(props.modelValue);

/**
 * 有关月度的名称列表
 */
const monthNameList = {
  chineseFullName: [
    "一月",
    "二月",
    "三月",
    "四月",
    "五月",
    "六月",
    "七月",
    "八月",
    "九月",
    "十月",
    "十一月",
    "十二月",
  ],
  fullName: [
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December",
  ],
  mmm: [
    "Jan",
    "Feb",
    "Mar",
    "Apr",
    "May",
    "Jun",
    "Jul",
    "Aug",
    "Sep",
    "Oct",
    "Nov",
    "Dec",
  ],
};
/**
 * 有关周几的名称列表
 */
const dayNameList = [
  {
    chineseFullName: "周日",
    chineseShortName: "日",
    fullName: "Sunday",
    shortName: "Sun",
    dayNumber: 0,
  },
  {
    chineseFullName: "周一",
    chineseShortName: "一",
    fullName: "Monday",
    shortName: "Mon",
    dayNumber: 1,
  },
  {
    chineseFullName: "周二",
    chineseShortName: "二",
    fullName: "Tuesday",
    shortName: "Tue",
    dayNumber: 2,
  },
  {
    chineseFullName: "周三",
    chineseShortName: "三",
    fullName: "Wednesday",
    shortName: "Wed",
    dayNumber: 3,
  },
  {
    chineseFullName: "周四",
    chineseShortName: "四",
    fullName: "Thursday",
    shortName: "Thu",
    dayNumber: 4,
  },
  {
    chineseFullName: "周五",
    chineseShortName: "五",
    fullName: "Friday",
    shortName: "Fri",
    dayNumber: 5,
  },
  {
    chineseFullName: "周六",
    chineseShortName: "六",
    fullName: "Saturday",
    shortName: "Sat",
    dayNumber: 6,
  },
];

/**
 * 今日
 */
const today = new Date();

/**
 * 日历的各项属性
 */
const calendarProps = reactive({
  target: {
    year: null,
    month: null,
    date: null,
    day: null,
    monthShortName: null,
    monthFullName: null,
    monthChineseFullName: null,
    firstDay: null,
    firstDayIndex: null,
    totalDays: null,
  },
  previous: {
    totalDays: null,
  },
});

/**
 * 用于展现的日历数据
 */
const calendarData = ref([]);

function setCalendarProps() {
  if (!targetDate.value) {
    targetDate.value = today;
  }
  // 获取目标日期的年月日星期几数据
  calendarProps.target.year = targetDate.value.getFullYear();
  calendarProps.target.month = targetDate.value.getMonth();
  calendarProps.target.date = targetDate.value.getDate();
  calendarProps.target.day = targetDate.value.getDay();

  if (
    calendarProps.target.year < MIN_YEAR ||
    calendarProps.target.year > MAX_YEAR
  ) {
    console.error("无效的年份，请检查传入的数据是否是正常");
    return;
  }

  // 获取到目标日期的月份【中文】名称
  let dateString;
  dateString = targetDate.value.toString().split(" ");
  calendarProps.target.monthShortName = dateString[1];
  calendarProps.target.monthFullName =
    monthNameList.fullName[calendarProps.target.month];
  calendarProps.target.monthChineseFullName =
    monthNameList.chineseFullName[calendarProps.target.month];
  // 获取目标月份的第一天是星期几，和在星期几中的索引值
  const targetMonthFirstDay = new Date(
    calendarProps.target.year,
    calendarProps.target.month,
    1
  );
  calendarProps.target.firstDay = targetMonthFirstDay.getDay();
  calendarProps.target.firstDayIndex = dayNameList.findIndex(
    (day) => day.dayNumber === calendarProps.target.firstDay
  );

  // 获取目标月份总共多少天
  const targetMonthLastDay = new Date(
    calendarProps.target.year,
    calendarProps.target.month + 1,
    0
  );
  calendarProps.target.totalDays = targetMonthLastDay.getDate();

  // 获取目标月份的上个月总共多少天
  const previousMonth = new Date(
    calendarProps.target.year,
    calendarProps.target.month,
    0
  );
  calendarProps.previous.totalDays = previousMonth.getDate();
}

/**
 * 生成日历的数据
 */
function setCalendarData() {
  let i;
  let date = 1;
  const originData = [];
  const firstRow = [];
  // 设置第一行数据
  for (i = 0; i <= 6; i++) {
    // 设置目标月份之前月份的日期数据
    if (i < calendarProps.target.firstDayIndex) {
      const previousDate =
        calendarProps.previous.totalDays -
        calendarProps.target.firstDayIndex +
        (i + 1);
      firstRow.push({
        dateObj: new Date(
          calendarProps.target.year,
          calendarProps.target.month - 1,
          previousDate
        ),
        dateNumber: previousDate,
        dateType: "previous"
      });
    } else {
      // 设置目标月份当月的日期数据
      firstRow.push({
        dateObj: new Date(
          calendarProps.target.year,
          calendarProps.target.month,
          date
        ),
        dateNumber: date,
        dateType: "current"
      });
      date++;
    }
  }
  originData.push(firstRow);
  // 设置后面五行的数据
  for (let j = 0; j <= 4; j++) {
    const rowData = [];
    for (let k = 0; k <= 6; k++) {
      // 设置目标月份剩下的日期数据
      if (date <= calendarProps.target.totalDays) {
        rowData.push({
          dateObj: new Date(
            calendarProps.target.year,
            calendarProps.target.month,
            date
          ),
          dateNumber: date,
          dateType: "current"
        });
      } else {
        // 设置目标月份下个月的日期数据
        const nextDate = date - calendarProps.target.totalDays;
        rowData.push({
          dateObj: new Date(
            calendarProps.target.year,
            calendarProps.target.month + 1,
            nextDate
          ),
          dateNumber: nextDate,
          dateType: "next"
        });
      }
      date++;
    }
    originData.push(rowData);
  }
  calendarData.value = originData;
}