how to add print option in javascript

Answer 1

easy

Answer 2

window.print();

Answer 3

and taking no parameter.
.

Answer 4

document.write("your text");

Answer 5

make a function like so...

function print (content){
document.write (content);
}

put this function in your code outside any other functions and then all you have to type is...

print ("whatever you need printed!");

or

print ("I'm writing to an output!");