比如以下内容：

配置的rules内容

const rules=ref({title:[{required:true,message:"请输入标题",trigger:"blur"},{max:50,message:"最大不能超过256个字",trigger:"blur"}],Category:[{required:true,message:"请选择分类",trigger:"change"}],Province:[{required:true,message:"请选择省份",trigger:"change"}],City:[{required:true,message:"请选择城市",trigger:"change"}],content:[{required:true,message:"请输入内容",trigger:"blur"}]
});

由于分类中v-model绑定的是三级的字段：InformationForm.extraProperties.Category，

这在js中配置的是Category:[{required:true,message:"请选择分类",trigger:"change"}]

导致匹配不上，永远会报请选择分类的提示信息，那该如何做呢？

其实原因在于prop绑定的值要和v-model一致，即：prop=“extraProperties.Category”，

v-model="InformationForm.extraProperties.Category"不变，

最后js中配置的rules需要把验证的字段名配置成prop绑定的值即：extraProperties.Category

如下：

<el-dialogv-model="dialogVisible":title="Title"width="600px":destroy-on-close="true"><el-form :model="InformationForm" ref="formRef" :rules="rules" class="demo-form-inline"><el-form-item label="标题" prop="title"><el-input v-model="InformationForm.title" placeholder="请输入标题" :disabled="readOnly"/></el-form-item><el-form-item label="分类" prop="extraProperties.Category"><el-select v-model="InformationForm.extraProperties.Category" placeholder="请选择分类" :disabled="readOnly"><el-optionv-for="item in categoryOptions":key="item.value":label="item.label":value="item.value"/></el-select></el-form-item><el-form-item label="地区" prop="extraProperties.Province"><el-row :gutter="20"><el-col :span="12"><el-select v-model="InformationForm.extraProperties.Province" placeholder="请选择省份" :disabled="readOnly" style="width: 240px" @change="provinceChange"><el-optionv-for="item in provinceOptions":key="item.text":label="item.value":value="item.text"/></el-select></el-col><el-col :span="12"><el-select v-model="InformationForm.extraProperties.City" placeholder="请选择市/区" style="width: 240px" :disabled="readOnly" ><el-optionv-for="item in cityOptions":key="item.text":label="item.value":value="item.text"/></el-select></el-col></el-row></el-form-item><el-form-item label="内容" prop="content"><EditorInput v-model="InformationForm.content" :readOnly="readOnly"/></el-form-item></el-form><template #footer><div class="dialog-footer"><el-button @click="dialogVisible = false">取消</el-button><el-button type="primary" @click="submit">确定</el-button></div></template></el-dialog><scripts>
const rules=ref({title:[{required:true,message:"请输入标题",trigger:"blur"},{max:50,message:"最大不能超过256个字",trigger:"blur"}],"extraProperties.Category":[{required:true,message:"请选择分类",trigger:"change"}],"extraProperties.Province":[{required:true,message:"请选择省份",trigger:"change"}],City:[{required:true,message:"请选择城市",trigger:"change"}],content:[{required:true,message:"请输入内容",trigger:"blur"}]
});
</scripts>

注意：js中的extraProperties.Category必须加引号，否则会因为包含点(.)报错