The main system (Party System Company) -> we do systems
Front-end need to prepare a blank page or a page just to request back-end interface
Returns a value, such as a rear end 401 of the host system to redirect unregistered state window.location.href (belt system id, callback address)
Log host system successfully transferred callback address front-end address stitching parameters (code) accessed via callback address? Code = ***
End of the second access address (address correction) code taken by the distal end of the access parameters
Take the request code to the backend interface
Wait state rear checkback
Return 0 goto successful login
500 returns authentication failure to jump to the wrong page