Now there are three different types of websites (under the same server), and the user table fields are different. How can we achieve single point of login?

Each website has its own user table. Is it necessary to integrate these three user tables into one? Or is there any other solution? Each website has its own user table. Is it necessary to integrate these three user tables into one?

Or is there any other solution?

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Each website has its own user table. Is it necessary to integrate these three user tables into one?

Or is there any other solution?

You can consider using Ucenter

If different websitesUser NameAndPasswordSame, or can be used to associate different website usersJsonp + auth + cookieSolution