Vi/vim Multi-line comments and uncomment

Multi-line Comments:

1. Enter command-line mode, press CTRL + V to enter Visual block mode, then press J, or K to select multiple lines to mark the lines that need comment

2. Press the capital letter I, then insert the comment, for example//

3. Press the ESC key to annotate all

To cancel multiple lines of comment:

1. Enter command line mode, press CTRL + V to enter Visual block mode, select the number of columns by letter L, for example//2 columns to be selected

2. Select the comment symbol by the letter J, or K

3. Press the D key to cancel all comments

Pair-line Comment: Ctrl_c
For multiline comment: First "V", enter block selection mode. Select a section of code. Ctrl_c
Similarly, the restored command is the same as above. If the line is Ctrl_c, it is annotated, then Ctrl_c and restored.
Note that the code should be neatly indented. When you select a block, make sure that the first row in the block is the most left. Otherwise there will be a problem.

Vi/vim Multi-line comments and uncomment