Are there any command/shortcut to auto-indent all my code on the page at once on Sublime Text 3?
e.g: On NetBeans I can do this with Alt+Shift+F.
That's quite simple in Sublime. Just Ctrl+Shift+P (to open tools pallet), type reindent, and pick Indentation: Reindent Lines. It should reindent all the file you are in, just remember to save before running the command, or it may not appear.
Auto-indenting on Sublime Text 3 - "Key Bindings"
Just add this binding to your "Key Bindings - User" file:
Preferences > Key Bindings - users
{"keys": ["alt+shift+f"], "command": "reindent", "args": {"single_line": false}}
And adding this code between the square brackets.
Now you can use Alt + Shift + f as your auto-indent shortcut
You can also use the "reindent" feature through the command palette. Ctrl + Shift + P
Ressources:
You can use one of many plugins which do the thing you need, for example, the one I am using:
来源：https://stackoverflow.com/questions/44803547/autoindent-on-sublime-text