前端日历时间按钮点击切换上周下周

<template>
...
      <el-form
        :inline="true"
        :model="searchForm"
        size="small"
        class="health-plan-schedule--form"
      >
        <el-form-item>
          <el-button
            size="small"
            @click="lastWeek"
          >
            上一周
          </el-button>
          <el-date-picker
            @change="changeOne"
            v-model="timesWeek"
            width="240"
            type="week"
            :format="getList.scheduleStartDate + ' 至 ' + getList.scheduleEndDate"
            placeholder="选择周"
          />
          <el-button
            size="small"
            @click="nextWeek"
          >
            下一周
          </el-button>
        </el-form-item>
      </el-form>
...
</template>

<script>
export default {
  data () {
    return {
      timesWeek: Date.now(), // 按照当前默认时间
      getList: {
        scheduleStartDate: '', // 排班开始日期
        scheduleEndDate: '', // 排班结束日期
      },
    }
  }
  methods: {
  //  转换时间格式
    fun (unixtimestamp) {
      const dt = new Date(unixtimestamp)
      const y = dt.getFullYear()
      const m = (dt.getMonth() + 1 + '').padStart(2, '0')
      const d = (dt.getDate() + '').padStart(2, '0')
      return `${y}-${m}-${d}`
    },
  // 当用户直接点击选择日期而不是点击进行以下操作
  // 此时val会默认传入星期一的时间戳
    changeOne (val) {
      const timeStamp = val.getTime() // 标准时间转为时间戳，毫秒级别
      this.getList.scheduleStartDate = this.fun(
        timeStamp - 24 * 60 * 60 * 1000
      ) // 开始时间
      this.getList.scheduleEndDate = this.fun(
        timeStamp + 24 * 60 * 60 * 1000 * 5
      ) // 结束时间
    },
    // 上一周
    // 604800000为一周的时间戳
    // 24 * 60 * 60 * 1000 * 7 = 604800000
    lastWeek () {
      this.getList.scheduleStartDate = this.fun(
        Date.parse(new Date(this.getList.scheduleStartDate)) - 604800000
      )
      this.getList.scheduleEndDate = this.fun(
        Date.parse(new Date(this.getList.scheduleEndDate)) - 604800000
      )
      this.$forceUpdate() // 强制更新
    },
// 下一周
    nextWeek () {
      this.getList.scheduleStartDate = this.fun(
        Date.parse(new Date(this.getList.scheduleStartDate)) + 604800000
      )
      this.getList.scheduleEndDate = this.fun(
        Date.parse(new Date(this.getList.scheduleEndDate)) + 604800000
      )
      this.$forceUpdate() // 强制更新
    }, 
  }
  mounted () {
  // 86400000为一天时间戳  // 604800000为一周时间戳
  // 因为组件的限制，因为组件是从上周日到本周六，所有需要减去一天的时间戳
  //  写法大概为一周7天，减去当前已过天数，将天数转换成时间戳，最后再转换成日期
    this.getList.scheduleEndDate = this.fun(
      Date.parse(new Date()) +
        ((7 - new Date(Date.parse(new Date())).getDay()) * 24 * 60 * 60 * 1000 -
          86400000))
  // 
    this.getList.scheduleStartDate = this.fun(
      Date.parse(new Date()) +
        ((7 - new Date(Date.parse(new Date())).getDay()) * 24 * 60 * 60 * 1000 -
          604800000))
  }
}
</script>