<template>
 <div class="date">
 <!-- 年份 月份 -->
 <div class="month">
 <p>{{ currentYear }}年{{ currentMonth }}月</p>
 </div>
 <!-- 星期 -->
 <ul class="weekdays">
 <li>一</li>
 <li>二</li>
 <li>三</li>
 <li>四</li>
 <li>五</li>
 <li>六</li>
 <li>日</li>
 </ul>
 <!-- 日期 -->
 <ul class="days">
 <li @click="pick(day)" v-for="(day, index) in days" :key="index">
 <!--本月-->
 <span v-if="day.getMonth()+1 != currentMonth" class="other-month">{{ day.getDate() }}</span>
 <span v-else>
 <!--今天-->
 <span v-if="day.getFullYear() == new Date().getFullYear() && day.getMonth() == new Date().getMonth() && day.getDate() == new Date().getDate()" class="active">{{ day.getDate() }}</span>
 <span v-else>{{ day.getDate() }}</span>
 </span>
 </li>
 </ul>
 </div>
</template>

<script>


 export default {
 name: 'date',

 data () {
 return {
 currentYear: 1970, // 年份
 currentMonth: 1, // 月份
 currentDay: 1, // 日期
 currentWeek: 1, // 星期
 days: [],
 }
 },

 mounted () {

 },

 created () {
 this.initData(null)
 },

 methods: {
 formatDate (year, month, day) {
 const y = year
 let m = month
 if (m < 10) m = `0${m}`
 let d = day
 if (d < 10) d = `0$rbxvfvtxz7v`
 return `${y}-${m}-$rbxvfvtxz7v`
 },

 initData (cur) {
 let date = ''
 if (cur) {
 date = new Date(cur)
 } else {
 date = new Date()
 }
 this.currentDay = date.getDate() // 今日日期 幾號
 this.currentYear = date.getFullYear() // 當前年份
 this.currentMonth = date.getMonth() + 1 // 當前月份
 this.currentWeek = date.getDay() // 1...6,0 // 星期幾
 if (this.currentWeek === 0) {
 this.currentWeek = 7
 }
 const str = this.formatDate(this.currentYear, this.currentMonth, this.currentDay)// 今日日期 年-月-日
 this.days.length = 0
 // 今天是周日，放在第一行第7個位置，前面6個 這里默認顯示一周，如果需要顯示一個月，則第二個循環為 i<= 35- this.currentWeek
 /* eslint-disabled */
 for (let i = this.currentWeek - 1; i >= 0; i -= 1) {
 const d = new Date(str)
 d.setDate(d.getDate() - i)
 // console.log(y:" + d.getDate())
 this.days.push(d)
 }
 for (let i = 1; i <= 7 - this.currentWeek; i += 1) {
 const d = new Date(str)
 d.setDate(d.getDate() + i)
 this.days.push(d)
 }
 },

 // 上個星期
 weekPre () {
 const d = this.days[0] // 如果當期日期是7號或者小于7號
 d.setDate(d.getDate() - 7)
 this.initData(d)
 },

 // 下個星期
 weekNext () {
 const d = this.days[6] // 如果當期日期是7號或者小于7號
 d.setDate(d.getDate() + 7)
 this.initData(d)
 },

 // 上一個月 傳入當前年份和月份
 pickPre (year, month) {
 const d = new Date(this.formatDate(year, month, 1))
 d.setDate(0)
 this.initData(this.formatDate(d.getFullYear(), d.getMonth() + 1, 1))
 },


 // 下一個月 傳入當前年份和月份
 pickNext (year, month) {
 const d = new Date(this.formatDate(year, month, 1))
 d.setDate(35)
 this.initData(this.formatDate(d.getFullYear(), d.getMonth() + 1, 1))
 },

 // 當前選擇日期
 pick (date) {
 alert(this.formatDate(date.getFullYear(), date.getMonth() + 1, date.getDate()))
 },
 },
 }
</script>

<style lang="scss">
 @import "~base";

 .date {
 height: px2rem(180);
 color: #333;

 .month {
 font-size: px2rem(24);
 text-align: center;
 margin-top: px2rem(20);
 }

 .weekdays {
 display: flex;
 font-size: px2rem(28);
 margin-top: px2rem(20);

 li {
 flex: 1;
 text-align: center;
 }
 }

 .days {
 display: flex;

 li {
 flex: 1;
 font-size: px2rem(30);
 text-align: center;
 margin-top: px2rem(10);
 line-height: px2rem(60);

 .active {
 display: inline-block;
 width: px2rem(60);
 height: px2rem(60);
 color: #fff;
 border-radius: 50%;
 background-color: #fa6854;
 }

 .other-month {
 color: #e4393c;
 }
 }
 }
 }
</style>