SP.BusinessData.Runtime.EntityIdentity.identifierCount property (sp.js)
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value =SP.BusinessData.Runtime.EntityIdentity.get_identifierCount()
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Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value =SP.BusinessData.Runtime.EntityIdentity.get_identifierCount()