Single-point logout method and device in Web application

The invention relates to the technical field of Web application system identity authentication, and particularly provides a single-point logout method in Web application, which comprises the following steps: after a CAS authentication server receives a logout request of a subsystem, sequentially sending logout notifications to other subsystems registered to the authentication server, and after each subsystem receives the logout notifications, sending the logout notifications to the other subsystems registered to the authentication server. A logout interface of the user can be called to carry out logout operation; and after the operation of the CAS authentication server is completed and the client receives a logout request, the client performs automatic logout of the session or token according to a single-point authentication mode of the client. Compared with the prior art, the method not only can realize cross-domain sending of the logout request, but also can efficiently realize simultaneous logout of a plur