Vi/vim multi-line comment and uncomment

Multi-line comment:

1. Enter the command line mode, press ctrl + v to enter the visual block mode, then press j or k to select multiple lines, and mark the lines to be annotated

2. Press the uppercase letter I and insert the annotator, for example //

3. Press the esc key and all comments will be made.

Cancel multi-line comment:

1. Enter the command line mode, press ctrl + v to enter the visual block mode, and press the letter l to select the number of columns horizontally, for example, // you need to select two columns

2. Press the letter j or k to select the annotator.

3. Press d to cancel all comments.