Element UI - DatePicker 自定义日期选择期间

<el-date-picker
    v-else
    v-model="searchForm.data_Selected"
    type="daterange"
    unlink-panels
    range-separator="～"
    start-placeholder="開始期間"
    end-placeholder="終了期間"
    :picker-options="pickerOptions"
    format="yyyy/MM/dd">
</el-date-picker>    

data() {
    return {
      pickerOptions: {
        shortcuts: [{
          text: '今日',
          onClick(picker) {
            const end = new Date()
            const start = new Date()
            picker.$emit('pick', [start, end])
          }
        }, {
          text: '昨日',
          onClick(picker) {
            const end = new Date()
            const start = new Date()
            start.setTime(start.getTime() - 3600 * 1000 * 24)
            end.setTime(end.getTime() - 3600 * 1000 * 24)
            picker.$emit('pick', [start, end])
          }
        }, {
          text: '先週',
          onClick(picker) {
            var weekDate = new Date(new Date().getTime() - 7 * 24 * 3600 * 1000)
            var weekDate2 = new Date(new Date().getTime() - 7 * 24 * 3600 * 1000)
            var day = weekDate.getDay()
            var time = weekDate.getDate() - day + (day === 0 ? - 6 : 1)
            var startDate = new Date(weekDate.setDate(time))
            var start = startDate.getFullYear() + '-' + (startDate.getMonth() +1 ) + '-' + startDate.getDate()
            var endDate = new Date(weekDate2.setDate(time + 6))
            var end = endDate.getFullYear() + '-' + ( endDate.getMonth() + 1) + '-' + endDate.getDate()
            picker.$emit('pick', [start, end])
          }
        }, {
          text: '先月',
          onClick(picker) {
            var year = new Date().getFullYear()
            var month = new Date().getMonth()
            if (month === 0) {
                month = 12
                year = year - 1
            } else if (month < 10) {
                month = '0' + month
            }
            var monthDate = new Date(year, month, 0)
            var start = year + '-' + month + '-01'
            var end = year + '-' + month + '-' + monthDate.getDate()
            picker.$emit('pick', [start, end])
          }
        }, {
          text: '今月',
          onClick(picker) {
            var year = new Date().getFullYear()
            var month = new Date().getMonth() + 1
            const start = year + '-' + month + '-01' 
            const end = new Date()
            picker.$emit('pick', [start, end])
          }
        }]
      },
      searchForm: {
        data_Selected: ''
      }
    }
  }

效果图：