1. A real-time multi-task scheduling method performed by a processor in a computing system for dynamically scheduling a plurality of tasks in the computing system, wherein the method comprises: determining a laxity of a scheduled task, wherein the laxity refers to a remaining idle time of the scheduled task based on a difference between a deadline for execution of the scheduled task and expected execution time of the scheduled task; assigning a first priority to the scheduled task based on the determined laxity of the scheduled task; determining a first priority queue of a plurality of priority queues for the scheduled task according to the assigned first priority of the scheduled task; determining that a laxity correction should be performed for the scheduled task during execution of the scheduled task according to a task completion proportion and a preset time, wherein the laxity correction is performed after the task completion proportion of the scheduled task is at least equal to a preset task proportion, wherein the task completion proportion is a percentage of execution progress of the scheduled task defined by a ratio of execution time at a current moment of time to the expected execution time of the scheduled task, wherein the preset task proportion is preset by setting a value in a program; acquiring a remaining execution time of the scheduled task according to the execution progress of the scheduled task and a time for which the scheduled task has been executed after determining that the laxity correction should be performed; acquiring a corrected laxity of the scheduled task according to the remaining execution time of the scheduled task and a deadline of the scheduled task after determining that the laxity correction should be performed; determining a second priority of the scheduled task according to the corrected laxity of the scheduled task, wherein the second priority is determined after the first priority; determining a second priority queue of the plurality of priority queues according to the second priority of the scheduled task, wherein the second priority queue is determined after the first priority queue; and scheduling the plurality of tasks according to the plurality of priority queues.