Click hijacking incident, the benefits are as follows:
1: You can add a centralized operation to prevent duplicate clicks, especially when sending asynchronous requests (no longer have to worry about double the submitted)
2: centralized collection of pages can all click click on the event, including asynchronous data request
3: centralized computing interfaces can request time
Reproduced in: https: //www.cnblogs.com/Kummy/p/10254108.html