a-upload图片上传

                        <a-upload
                                v-model:file-list="state.form.fileList"
                                name="file"
                                :multiple="true"
                                accept="image/jpeg, image/png"
                                action="/school/attachment/upload"
                                :before-upload="beforeUpload"
                                @change="handleFilesChange"
                                @preview="handlePreview"
                                style="width: 350px"
                        >
                            <a-button
                                    style="background-color: #eaf2ff; border: none"
                                    :loading="state.fileLoading"
                            >
                                <upload-outlined/>
                                <span style="color: #2c79ff">上传</span>
                            </a-button>
                        </a-upload>