I copied the code, but the display is different.

Question

I copied the code, but the display is different. The data can be displayed

but it cannot be seen which level it is.

Answer 1

Post your code, how can we help you solve it? Post your code

Answer 2

Check yourself to see if there are any naming differences, capitalization, etc. . These may cause differences. . .

Answer 3

You can post part of the code so that no problem can be seen. I have tested the code in the tutorial and it works. Or you can make some modifications to the original code.