jeecgboot-vue3使用a-select placeholder不显示
如果是给a-select绑定值得初始值设置为‘’，那么placeholder不会显示，例如
<a-select
v-model:value="formData.areaName"
:options="stateData.map((pro) => ({ value: pro.areaName }))"
@change="selectChange"
placeholder="State/Division"
class="selectInput"
size="large"
/>
const formData=ref({
areaName:''
})如果需要显示占位符，将绑定值得初始值设为null
const formData=ref({
areaName:null;//或者undefined
})