SP.UpgradeInfo.upgradeType property (sp.js)

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The type of upgrade for the site collection. The type can be either a build to build upgrade (value = 0), or a version to version upgrade (value = 1).

Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013

var value =SP.UpgradeInfo.get_upgradeType()

Return value

NUMBER