Problems with indentation of curly braces in vim

Question

Now assume that you write an if statement. After typing the left brace and pressing Enter, it looks like this (auto-completion is set)

if(a < b) {
}

The effect I want is after pressing Enter
if(a < b) {
I//The cursor is here
}

How should you set up vimrc like this?
Thanks!

Answer 1

The vim command is too complicated, we recommend SUB

Answer 2

This can be accomplished with abbreviations:

:iabbrev {i {}<esc>i<cr>O

1. {i Feel free to change
2. O will be indented according to the current indent setting
3. If you are not satisfied with the current effect, you can adjust it according to the document