write a javascript for below questions.

Learning Goal: I’m working on a javascript practice test / quiz and need an explanation and answer to help me learn.

• 1. Display numbers
  • Write a JavaScript that prints all the numbers from 1 to 20 on a page when it loads.
  • Use a loop, do not just write the numbers
• 2.Prompt for name
  • Write a script that asks the user for their name (use prompt)
  • Then display the name in a confirm box and ask if correct
  • If it is correct, display a message on the page that says “Welcome “ followed by the name.
  • If it is not correct, loop through and ask for input again
• 3.Enter your grade
  • Ask the user for a number between 1-100
  • If the user enters 90-100 display A
  • If the user enters 80-89 display B
  • If the user enters 70-79 display C
  • If the user enters 60-69 display D
  • If the user enters below 60 display F