编辑“动态模组创作”（章节）

==== Parameter conditions ====

You can also write a condition block for parameters with "double" square brackets, making the stuff within it only called if the parameter (here $homeworld$) is passed through in the effect call.

<pre>[[homeworld] <<<STUFF HERE>>>]</pre>
Example:
<pre>
 	last_created_species = {
 		save_global_event_target_as = vaadwaurSpecies
 		[[homeworld]set_species_homeworld = event_target:tempHomeworld]
 	}
</pre>

You can also declare a fallback value in the parameter itself using the pipe symbol, e.g.:
<pre>	has_global_flag = crisis_stage_$STAGE|1$</pre>

The vanilla game ([[2.6|2.6]]) does not yet use much of this scripted syntax feature (introduced in [[Patch 2.3 版本|2.3]]). Only few examples can be found in:
 common/scripted_effects/archaeology_event_effects.txt
 common/scripted_triggers/00_scripted_triggers.txt

Instead, [[Star_Trek_New_Civilisations|Star Trek]] mods like "New Civilisations" use this feature a little more often.