请问怎么在table的input中设置可以都不填,但是填了一个就必需填年份
<table class="projectTable" :class="{'disable': disable}">
<tr>
<td class="label">年份</td>
<td class="label">投入(万元)</td>
<td class="label">销售(万元)</td>
<td class="label">税收(万元)</td>
<td class="label">净利润(万元)</td>
<td class="label">备注</td>
</tr>
<tr v-for="(item, index) in projectInfo.inputSalesTaxSOList" :key="index">
<td>
<el-date-picker
type="year"
value-format="yyyy"
v-model="item.projectYear"
:disabled="disable"
/>
</td>
<td><input type="text" :disabled="disable" v-model="item.investAmount"></td>
<td><input type="text" :disabled="disable" v-model="item.salesAmount"></td>
<td><input type="text" :disabled="disable" v-model="item.tax"></td>
<td><input type="text" :disabled="disable" v-model="item.netProfit"></td>
<!-- <td><input type="text" v-model="item.remarks"></td> -->
<td><el-input
type="textarea"
autosize
v-model="item.remarks"
maxlength="50"
:disabled="disable"
show-word-limit /></td>
</tr>
</table>
```
请各位大佬帮忙解答谢谢