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1、因为仿钉钉设计器里抄送人是一个服务任务，所以要根据这个服务任务进行处理

2、前端就是一个抄送，选择人

3、这里用了jeecg的选择人组件

<el-form-item prop="users" label="指定人员" v-if="activeData.assigneeType === 'user'">
      <div style="width:100%">
        <j-select-user-by-dept 
          :zIndex="3000"
          v-model:value="activeData.users" 
          :multi="true" 
          :placeholder="`请选择${type}人`"
          @getSelectResult="handleSelectUsers">
        </j-select-user-by-dept>
      </div>
    
    </el-form-item>

4、后端对这个处理如下：

public class CcNode extends AssigneeNode {
    // 表单属性
    private List<FormProperty> formProperties = new ArrayList<>();
    // 操作权限
    private Map<String, Boolean> operations = new LinkedHashMap<>();

    @Override
    public List<FlowElement> convert() {
        ArrayList<FlowElement> elements = new ArrayList<>();
        // 服务节点
        ServiceTask serviceTask = new ServiceTask();
        serviceTask.setId(this.getId());
        serviceTask.setName(this.getName());
        // serviceTask.setAsynchronous(true);
        serviceTask.setImplementationType(ImplementationType.IMPLEMENTATION_TYPE_CLASS);
        serviceTask.setImplementation("org.jeecg.modules.flowable.ServiceTask.ccDelegate");
        //增加扩展属性 add by nbacheng
        Map<String, List<ExtensionElement>> extensionElements = new HashMap<String, List<ExtensionElement>>();
        ExtensionElement extensionElementTotal = new ExtensionElement();
        extensionElementTotal.setName("flowable:properties"); 
        ExtensionElement extensionElement = new ExtensionElement();
        extensionElement.setName("flowable:property");
        ExtensionAttribute extensionAttributeName = new ExtensionAttribute();
        extensionAttributeName.setName("name");
        extensionAttributeName.setValue("ccUserList");
        extensionElement.addAttribute(extensionAttributeName);
        ExtensionAttribute extensionAttributeValue = new ExtensionAttribute();
        extensionAttributeValue.setName("value");
        extensionAttributeValue.setValue(StringUtils.join(this.getUsers(), ","));
        extensionElement.addAttribute(extensionAttributeValue);
        extensionElementTotal.addChildElement(extensionElement);
        extensionElements.put("ccUserList", CollUtil.newArrayList(extensionElementTotal));
        serviceTask.setExtensionElements(extensionElements);
        elements.add(serviceTask);
        // 下一个节点的连线
        Node child = this.getChild();
        SequenceFlow sequenceFlow = this.buildSequence(child);
        elements.add(sequenceFlow);
        // 下一个节点
        if (Objects.nonNull(child)) {
            child.setBranchId(this.getBranchId());
            List<FlowElement> flowElements = child.convert();
            elements.addAll(flowElements);
        }
        return elements;
    }

}

4、实际的效果图与xml