element ui DatePicker 禁用當前日以前的時間

      <el-date-picker
          style="width:195px"
          value-format="yyyy-MM-dd"
          v-model="form.start_date"
          type="date"
          :picker-options="pickerOptions"
          placeholder="選擇日期">
        </el-date-picker>
...

    data() {
      return {
        pickerOptions1: {
         disabledDate(time) {
            return time.getTime() < Date.now() - 8.64e7;
          },
        }       
      }
    }