JS mouse event, keyboard event instance code

Narrated: Which button of the mouse is clicked, the current mouse cursor coordinates is how many, the key is pressed the Unicode code is how many, the current mouse cursor relative to the screen coordinates is how much, the current mouse cursor coordinates is how much, the SHIFT key is pressed, the current is clicked which element

1. Which button of the mouse is clicked?

2. What is the cursor coordinates of the current mouse?
3. What is the Unicode code of the key being pressed?
4. What are the coordinates of the current mouse cursor relative to the screen?
5. What is the cursor coordinates of the current mouse?
6. Is the SHIFT key pressed?
7. Which element is currently clicked?
JS mouse event, keyboard event instance code