JParameter 在 Joomla 3.0 中被删除，现在是 JForm 或在大多数情况下 JRegistry 应该使用.

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

所以使用下面的代码，并根据自己的需要进行更改

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

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