Here's another. It outputs 12. Need detailed clarification, please.

Question

var a = 0;
for ( k = 1; k <= 2; k = k + 1) {
for ( i = 0; i <= 5; i + 1) {}
a++
document.write (a);
}

Answer 1

Because the code "document.write" is still inside of the first for loop.So it will not add the variable "a" as 1+1=2. It will only add the variable "a" as 1+1=11.
So you should move the "document.write" command outside the for loop(after the brace).
In addition there is some additional errors .You should replace the text "i +1" in your code to "i =i+1".
put ";" after the code "a++".
Then run the code.It will result the output as 2.