Abstract: A salt of a nitrogen-containing fused heterocyclic compound or a crystal form thereof, and a preparation method therefor, a pharmaceutical composition thereof, and a use thereof, in particular, a salt of compound I as shown below or a crystal form thereof, and a preparation method, a pharmaceutical composition and a use. The salt of compound I or the crystal form thereof exhibits at least one of the following advantages: improved bioavailability, great mechanical properties, improved chemical stability, excellent fluidity, great compressibility, and improved dissolution characteristics.

Abstract: The embodiments of the present invention provide an application interface update method, apparatus and system. One method includes: monitoring interface update data on the server side during the running of a client; receiving the monitored interface update data; and updating the current application interface according to said interface update data, thereby rendering an updated application interface; wherein, buttons in said current application interface are different from buttons in said updated application interface, and/or the arrangement of buttons in said current application interface is different from the arrangement of buttons in said updated application interface.

Abstract: The embodiments of the present invention provide an application interface update method, apparatus and system. One method includes: monitoring interface update data on the server side during the running of a client; receiving the monitored interface update data; and updating the current application interface according to said interface update data, thereby rendering an updated application interface; wherein, buttons in said current application interface are different from buttons in said updated application interface, and/or the arrangement of buttons in said current application interface is different from the arrangement of buttons in said updated application interface.