> For the complete documentation index, see [llms.txt](https://docs.gpmautomate.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gpmautomate.com/automate-zh/action-shi-yong-zhi-nan/blocks/while.md).

# While

与 For 循环（以固定次数循环）不同，While 循环通常用于当您事先不知道脚本需要重复多少次，而完全取决于运行时的实际状态的情况。

🎥 观看更多教程视频：[点击这里](https://youtu.be/4O4dPC-CNHM)。

#### 工作原理：

* 在每次循环开始之前，系统会检查您配置的条件（Condition）。
* 如果条件尚未满足，While 语句块内的操作将继续执行。
* 一旦条件满足，系统将停止循环，并转到 While 语句块下方的后续操作。

#### 实际案例：等待获取 Mail/Telegram 的 OTP 验证码

假设您正在制作账号注册脚本，需要等待系统将 OTP 验证码发送到邮箱。由于邮件到达的时间可能快也可能慢，您无法提前知道需要等待多久：

* 您将 Read mail code 操作放入 While 语句块中。
* 循环的停止条件：当变量 `$otpCode` 获得值（不再为空）时。
* 系统将不断检查并读取邮箱。一旦成功获取到 OTP 验证码，条件满足，循环停止，脚本继续执行填写验证码的步骤。

<figure><img src="/files/dAKiUvMThZloy24KyP5S" alt=""><figcaption></figcaption></figure>

> ⚠️ 重要提示：使用 While 循环时，您需要确保语句块内的操作会改变停止条件的状态。如果条件配置错误，或邮件永远不会到达，脚本将陷入无限循环（脚本卡死）的状态。
>
> 为了优化，您应该额外结合一个用于记录检查次数的变量。如果超过 10 次仍没有收到邮件，请使用 Exit loop 操作退出循环，或使用 Stop 操作彻底停止程序并转到下一个 profile。


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