Displaying and recognizing two-dimensional code

1. A computer-implemented method, comprising:

receiving, at a user device, an instruction for displaying a two-dimensional code;

obtaining, by the user device, multiple two-dimensional codes corresponding to a user; and

sequentially displaying, by the user device, the multiple two-dimensional codes based on a plurality of predetermined time intervals, so that the multiple two-dimensional codes form a dynamic two-dimensional code on a display page,

wherein a ratio of each of the plurality of predetermined time intervals to a validity period of each of the multiple two-dimensional codes is less than a predetermined threshold, wherein the multiple two-dimensional codes comprise multiple groups of two-dimensional codes, and each group of the multiple groups of two-dimensional codes comprises a corresponding first quantity of two-dimensional codes, and wherein sequentially displaying the multiple two-dimensional codes based on the plurality of predetermined time intervals comprises displaying the first quantity of two-dimensional codes in each group based on a first time interval, and sequentially displaying the multiple groups of two-dimensional codes based on a second time interval different from the first time interval.

2. The computer-implemented method of claim 1 , wherein obtaining multiple two-dimensional codes corresponding to the user comprises:

sending, to a server, a first request for the multiple two-dimensional codes; and

receiving, at the user device, the multiple two-dimensional codes from the server in response to the first request.

3. The computer-implemented method of claim 2 , further comprising receiving the plurality of predetermined time intervals in response to the first request.

4. The computer-implemented method of claim 1 , wherein obtaining multiple two-dimensional codes corresponding to the user comprises generating the multiple two-dimensional codes based on seed data obtained from a server.

5. The computer-implemented method of claim 1 , wherein each of the multiple two-dimensional codes comprises account information for an account of the user.

6. The computer-implemented method of claim 1 , wherein each of the plurality of predetermined time intervals is less than or equal to 33 milliseconds.

7. The computer-implemented method of claim 1 , wherein sequentially displaying the multiple two-dimensional codes based on the plurality of predetermined time intervals comprises, for each of multiple iterations, displaying, in a sequence, each two-dimensional code for a respective predetermined time period for the two-dimensional code.

8. The computer-implemented method of claim 1 , wherein the validity period of each of the multiple two-dimensional codes comprises a time period for which the two-dimensional code is valid.

9. A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

receiving, at a user device, an instruction for displaying a two-dimensional code;

obtaining, by the user device, multiple two-dimensional codes corresponding to a user; and

sequentially displaying, by the user device, the multiple two-dimensional codes based on a plurality of predetermined time intervals, so that the multiple two-dimensional codes form a dynamic two-dimensional code on a display page,

wherein a ratio of each of the plurality of predetermined time intervals to a validity period of each of the multiple two-dimensional codes is less than a predetermined threshold, wherein the multiple two-dimensional codes comprise multiple groups of two-dimensional codes, and each group of the multiple groups of two-dimensional codes comprises a corresponding first quantity of two-dimensional codes, and wherein sequentially displaying the multiple two-dimensional codes based on the plurality of predetermined time intervals comprises displaying the first quantity of two-dimensional codes in each group based on a first time interval, and sequentially displaying the multiple groups of two-dimensional codes based on a second time interval different from the first time interval.

10. The non-transitory, computer-readable medium of claim 9 , wherein obtaining multiple two-dimensional codes corresponding to the user comprises:

sending, to a server, a first request for the multiple two-dimensional codes; and

receiving, at the user device, the multiple two-dimensional codes from the server in response to the first request.

11. The non-transitory, computer-readable medium of claim 9 , wherein sequentially displaying the multiple two-dimensional codes based on the plurality of predetermined time intervals comprises, for each of multiple iterations, displaying, in a sequence, each two-dimensional code for a respective predetermined time period for the two-dimensional code.

12. The non-transitory, computer-readable medium of claim 9 , wherein the validity period of each of the multiple two-dimensional codes comprises a time period for which the two-dimensional code is valid.

13. A computer-implemented system, comprising:

one or more computers; and

one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:

receiving, at a user device, an instruction for displaying a two-dimensional code;

obtaining, by the user device, multiple two-dimensional codes corresponding to a user; and

sequentially displaying, by the user device, the multiple two-dimensional codes based on a plurality of predetermined time intervals, so that the multiple two-dimensional codes form a dynamic two-dimensional code on a display page,

wherein a ratio of each of the plurality of predetermined time intervals to a validity period of each of the multiple two-dimensional codes is less than a predetermined threshold, wherein the multiple two-dimensional codes comprise multiple groups of two-dimensional codes, and each group of the multiple groups of two-dimensional codes comprises a corresponding first quantity of two-dimensional codes, and wherein sequentially displaying the multiple two-dimensional codes based on the plurality of predetermined time intervals comprises displaying the first quantity of two-dimensional codes in each group based on a first time interval, and sequentially displaying the multiple groups of two-dimensional codes based on a second time interval different from the first time interval.

14. The computer-implemented system of claim 13 , wherein obtaining multiple two-dimensional codes corresponding to the user comprises:

sending, to a server, a first request for the multiple two-dimensional codes; and

receiving, at the user device, the multiple two-dimensional codes from the server in response to the first request.

15. The computer-implemented system of claim 13 , wherein the validity period of each of the multiple two-dimensional codes comprises a time period for which the two-dimensional code is valid.

16. A computer-implemented method, comprising:

obtaining two-dimensional code data by sequentially reading a predetermined quantity of two-dimensional codes from multiple two-dimensional codes sequentially displayed on a display page based on a predetermined time interval,

wherein the predetermined quantity of two-dimensional codes comprises multiple groups of two-dimensional codes, and each group of the multiple groups of two-dimensional codes comprises a corresponding first quantity of two-dimensional codes, and wherein the multiple two-dimensional codes are sequentially displayed based on a plurality of predetermined time intervals, wherein the first quantity of two-dimensional codes in each group is displayed based on a first time interval, and the multiple groups of two-dimensional codes are sequentially displayed based on a second time interval different from the first time interval; and

sending the two-dimensional code data to a server for verification of each two-dimensional code of the predetermined quantity of two-dimensional codes.

17. The computer-implemented method of claim 16 , wherein sequentially reading the predetermined quantity of two-dimensional codes is performed for at least predetermined duration until the predetermined quantity of two-dimensional codes are read.