elementUI table中动态设置datepicker的禁用日期disabledDate

这样的日期动态修改，禁止选择默认日期的之前时间

<el-table-column property="" align="center" label="配送开始时间" min-width="120":show-overflow-tooltip="true">
    <template slot-scope="scope">
        <el-date-picker
                :clearable="false"
                v-model="scope.row.purchaseCycleStartDate"
                type="date"
                @focus="testPurchaseCycleStartDate(scope.row.purchaseCycleStartDate)"
                :picker-options="pickerOptions1"
                placeholder="选择日期">
        </el-date-picker>
    </template>
</el-table-column>

computed: {
    pickerOptions1() {
        let that = this;
        return {
            disabledDate(time) {
                let maxDate = Date.parse(that.startDate);
                return time.getTime() <= maxDate;
            }
        }
    }
    
}

testPurchaseCycleStartDate(row) {
    this.startDate = row
}