注意：重点在28 30 31天
1.初始化一些数据并且对特殊的日期进行处理

2. // 根据年月日设置当前月有多少天 并更新年月日数组
这个方法在生命周期onload，created生命周期调用一次 其中传入的值为上面截图初始化的数据即可，_th为this实例
还需要在日历组件滑动onchange时调用一次,传入的参数为当前onchange里接收的参数
dataMethods(year, month, day, hour, _th) {
let daysNum =
year === nowYear && month === nowMonth
? getDays(year, month)
: getDays(year, month);
day = day > daysNum ? 1 : day;

        let years = [];
        let months = [];
        let days = [];
        let hours = [];

        let yearIdx = 0;
        let monthIdx = 0;
        let dayIdx = 0;
        let hourInx = 0;

        // 重新设置年份列表
        for (let i = nowYear; i <= nowYear + 10; i++) {
            years.push(i);
        }
        years.map((v, idx) => {
            if (v === year) {
                yearIdx = idx;
            }
        });

        // 重新设置月份列表
        for (let i = 1; i <= 12; i++) {
            if (i < 10) {
                i = "0" + i;
            }
            months.push(i);
        }
        months.map((v, idx) => {
            if (v === month) {
                monthIdx = idx;
            }
        });

        // 重新设置日期列表
        for (let i = 1; i <= daysNum; i++) {
            days.push(i);
        }
        days.map((v, idx) => {
            if (v === day) {
                dayIdx = idx;
            }
        });

        // 重新设置时间列表
        for (let i = 0; i <= 23; i++) {
            if (i < 10) {
                i = "0" + i;
            }
            hours.push("" + i);
        }
        hours.map((v, idx) => {
            if (v === hour) {
                hourInx = idx;
            }
        });

        _th.years = years;
        _th.months = months;
        _th.days = days;
        _th.months = months;
        _th.year = year;
        _th.month = month;
        _th.day = day;
        _th.hours = hours;
        _th.hour = hour;
    }