SP.Taxonomy.TermSet.isOpenForTermCreation property (sp.taxonomy)
Indicates whether the TermSet can be updated by all users, or alternatively just by the specified contributors for the TermGroup object.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.Taxonomy.TermSet.get_isOpenForTermCreation()
SP.Taxonomy.TermSet.set_isOpenForTermCreation(a)
Return value
Returns T:System.Boolean.