# 评估 (Eval)

节点执行字符串中描述的 JavaScript 命令。

<figure><img src="/files/osPVwW0KgFXCCCyg5aeq" alt=""><figcaption></figcaption></figure>

<table><thead><tr><th width="258">参数</th><th>说明</th></tr></thead><tbody><tr><td>JavaScript</td><td>输入 JavaScript 代码</td></tr><tr><td>Inject variavles</td><td>选择要插入的变量，该变量可以在js函数中使用</td></tr><tr><td>Output variable</td><td>将 Javascript 脚本函数返回的值存储在变量中。</td></tr></tbody></table>

我们有以下示例：当您访问网站时，您想要单击某个元素，除了使用单击按钮之外，您还可以使用 Eval 节点来执行该单击操作。我们有一个简单的脚本如下：

<figure><img src="/files/KEVsQy1pawKQ4kSzULB1" alt=""><figcaption></figcaption></figure>

在 Eval 节点中，输入以下内容以便能够单击所需的元素：

<figure><img src="/files/qPtr7xt6uuqe5NTwsujE" alt=""><figcaption></figcaption></figure>

这样您也可以单击所需的元素，而无需使用单击按钮。

{% file src="/files/lm6HdliLB985jsshyIlD" %}


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