Pictured:
The right border of the above picture is missing. I used web development tools to debug and found that the inner container is too large. So I thought it was caused by incorrect "rendering" of the interface by jquery-easyui.
At first I thought it was caused by adding duplicate code, but after removing it, it still remains:
Considering the context of interface "rendering", I tried to delay execution of the code snippet, and the problem was solved.
Original question script: