你好，请问excel导出的表格末尾都会有null是什么原因

![输入图片说明](https://images.gitee.com/uploads/images/2022/0324/182351_41583109_1872722.png "屏幕截图.png")

template结构：

```
<vue3-json-excel
            class="export-excel-wrapper"
            :fields="excelDataFields"
            :json-data="selectData"
            :name="excelFileName"
            :header="excelFileName"
        >
            <el-button type="primary" size="small" style="margin-right: 10px;">
                导出
            </el-button>
        </vue3-json-excel>
```
setup 逻辑：
```
const selectData = ref([
    {
        auditState: 0,
        channel: "",
        checksumData: "",
        createdAt: "2022-03-23 13:36:44",
        customer: "",
        group: "默认分组",
        groupName: "默认分组",
        height: 0,
        id: "10845",
        installAddress: "",
        installType: 0,
        location: "",
        mac: "CC0000BB2211",
        macText: "CC0000BB2211",
        name: "CC0000BB2211",
        no: "",
        online: 0,
        onoffs: "",
        onoffsVo: [],
        region: "",
        resolution: "0*0",
        ringRoad: "",
        screenDirection: 0,
        sim: "89861120235007360004",
        terminalId: "10845",
        'tvNo': "",
        'week': "",
        'width': 0,
    }
])

const excelDataFields = reactive({
    "主机编码": {
        field: 'mac',
        callback: (val: any) => {
            return `${val}&nbsp`
        }
    },
    "电视编码": {
        field: 'tvNo',
        callback: (val: any) => {
            return `${val}&nbsp`
        }
    },
    "客户名称": {
        field: 'customer',
        callback: (val: any) => {
            return `${val}&nbsp`
        }
    },
    "分组": 'group',
    "安装地址": 'installAddress',
    "安装位置": 'location',
    "安装方式": {
        field: 'installType',
        callback: (val: any) => {
            const item = installTypeArray.find(item => item.value == Number(val))
            return item ? item.title : ''
        }
    },
    "屏幕方向": {
        field: 'screenDirection',
        callback: (val: any) => {
            const item = screenDirectionArray.find(item => item.value == Number(val))
            return item ? item.title : '未知'
        }
    },
    "尺寸": {
        field: 'screenSize',
        callback: (val: any) => {
            return `${val}&nbsp  `
        }
    },
    "渠道": 'channelName',
    "行政区": 'regionName',
    "环路": 'ringRoadName',
    "sim": 'sim',
    "备注": 'comment',
    "开机时间": 'startupTime',
    "关机时间": 'shutdownTime',
    "预警规则": 'warnName',

})
```

wuhaoxiang/vue3-json-excel

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