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Update 服务端表达式.md #15872

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Jul 27, 2023
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11 changes: 11 additions & 0 deletions product/移动与通信/云开发低代码平台/开发指南/高级功能/服务端表达式.md
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>?**执行前条件**需要表达式返回**布尔值 Boolean** 类型数据。

### 工作流
#### 属性配置
假设已有开始节点配置了输入变量的工作流
![](https://qcloudimg.tencent-cloud.cn/raw/10aa5cc7ed4f3b0026f073b95355b69c.png)
如果想在审批节点中设定审批人为该输入变量中的某字段，将审批节点**任务接收人**类型选为表达式
![](https://qcloudimg.tencent-cloud.cn/raw/034ccb4c8c37d51c150e850be4ac5228.png)
在表达式编辑器页面，从右侧**参数**列表可以选择流程中的变量，从右侧**函数列表**对变量进行函数公式处理
![](https://qcloudimg.tencent-cloud.cn/raw/590ef810f71afe5cf926d01f182712cb.png)

#### 表达式元素
具体可参见 [高级活动-表达式](https://cloud.tencent.com/document/product/1301/77290#.E8.A1.A8.E8.BE.BE.E5.BC.8F)

## 基础语法
目前表达式仅支持单行表达式，可以进行数值、逻辑、变量提取、函数调用及混合调用。
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