for (i=0;i < 10; i++) { document.write(i); } What is the output? 0123456789 How would you modify the code so that it prints the numbers

What is the output? 0123456789

How would you modify the code so that it prints the numbers backwards? Please list your codes.

How would you modify the code so that it prints only the even numbers? Please list your codes.

How would you modify the code so that it sums all the values of i and prints the final sum? Please list your codes.