JParameter在Joomla 3.0中已删除，现在应该使用JForm或大多数情况下使用JRegistry.

JParameter was removed in Joomla 3.0 and now either JForm or in most cases JRegistry should be used.

因此，请使用以下代码，并进行更改以适合您自己的需求

So use the following code, and change to suit your own needs

$jparams = new JRegistry();
$variable = $jparams->get('param_name');