element ui form 表单校验upload是否有上传

查到资料

可以绑定在一个多选上，校验此绑定的值

 1 <el-form-item label="上传图片" prop="双向绑定值">
 2 <el-checkbox-group v-model="双向绑定值"></el-checkbox-group>
 3 <el-upload
 4   ref="upload"
 5   :action='dataUrl'
 6   :data="productImages"
 7   list-type="picture-card"
 8   :file-list="双向绑定值">
 9   <i class="el-icon-plus"></i>
10 </el-upload>
11 </el-form-item>

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