如果您需要获取并设置变量，我建议您使用vars速记

If you need to get and set variables I would recommend using vars shorthand

根据文档

属性与变量不同. 变量是线程本地的；属性是所有线程共有的，需要使用__P或__property函数进行引用.

Properties are not the same as variables. Variables are local to a thread; properties are common to all threads, and need to be referenced using the __P or __property function.

因此，我建议将变量设置为:vars.put('foo', 'bar')并以${foo}的形式访问它们，根据我的期望，您将为每个线程(虚拟用户)获得不同的PC_CREATED_PROMO_CODE

So I would suggest setting variables as: vars.put('foo', 'bar') and accessing them as ${foo} where required as my expectation is that you will be getting different PC_CREATED_PROMO_CODE for each thread (virtual user)

另外请注意，还建议您尽可能避免编写脚本，因此请考虑使用

Also be aware that it is also recommended to avoid scripting where possible so consider going for JSON Extractor instead.