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---
title: 代码动作中处理数组
description: 学习如何在工作流代码操作中正确处理数组输入。
---
当在代码操作中与数组一起工作时,您可能会遇到两个共同的挑战:
1. **作为字符串传递的数组** - 来自外部系统或前几步的数据作为字符串而不是实际数组
2. **不能选择单个项目** — 您只能选择整个数组,而不是其中的特定字段
两者都可以用代码节点解决。
## 从字符串解析数组
数组通常是作为字符串或 JSON 而不是本机数组在工作流步骤之间传递的。 这种情况发生在:
* 通过 HTTP 请求从外部 API 接收数据
* 正在处理 webhook payload
* 工作流步骤之间传输数据
**Solution**:在代码开始时添加此模式:
```javascript
export const main = async (params: {
users: any;
}): Promise<object> => {
const { users } = params;
// Handle input that may come as a string or an array
const usersFormatted = typeof users === "string" ? JSON.parse(users) : users;
// Now you can safely work with usersFormatted as an array
return {
users: usersFormatted.map((user) => ({
...user,
activityStatus: String(user.activityStatus).toUpperCase(),
})),
};
};
```
键行 `typeof users === "string" ? JSONparse(users) : users`检查输入是否是字符串, 如果需要解析它, 或者如果它已经是一个数组直接使用它。
## 从数组中提取个别字段
Web 钩子可能返回一个数组,如'答案: [...]', 但在随后的工作流步骤中,您只能选择 **整个数组** ——而不是其中的个别项目。
**Solution**: 添加代码节点来提取特定字段并将其作为结构化对象返回:
```javascript
export const main = async (params: {
answers: any;
}): Promise<object> => {
const { answers } = params;
// Handle input that may come as a string or an array
const answersFormatted = typeof answers === "string"
? JSON.parse(answers)
: answers;
// Extract specific fields from the array
const firstname = answersFormatted[0]?.text || "";
const name = answersFormatted[1]?.text || "";
return {
answer: {
firstname,
name
}
};
};
```
代码节点返回结构化对象而不是数组。 在随后的步骤中,您现在可以从变量选择器中选择单个字段,例如`answer.firstname` 和 `answer.name` 。
<Tip>
**想要遍历数组而不是提取字段?** 当一个 Code 或 Logic Function 步骤返回顶层数组时,你可以将其直接传入 [Iterator](/l/zh/user-guide/workflows/capabilities/use-iterator):在 Iterator 的输入中选择该步骤的 **Whole list** 选项,然后在循环内部使用 `{{iterator.currentItem}}` 引用每个元素。 在那种情况下,你不需要将数组重构为对象。
</Tip>
<Tip>
点击代码编辑器右上角的方形图标在全屏显示它——因为默认编辑器宽度是有限的,所以它是有用的。
</Tip>