SP.UI.ApplicationPages.ClientPeoplePickerQueryParameters.webApplicationID property (sp.js)
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value =SP.UI.ApplicationPages.ClientPeoplePickerQueryParameters.get_webApplicationID()
SP.UI.ApplicationPages.ClientPeoplePickerQueryParameters.set_webApplicationID(value)