Can some pls explain this else statement to me

Question

var pos = 0;
//our box element
var box = document.getElementById("box");
var t = setInterval(move, 10);

function move() {
if(pos >= 150) {
clearInterval(t);
}
else {
pos += 1;
box.style.left = pos+"px";
}
}

Answer 1

It adds 1 to "pos" and adds a CSS attribute to #box with the "pos" in pixels.

Answer 2

firstly we set pos to one. then select element with id box. then me use setIterval function i.e call a function after some time given by user. as in example its call move function .01 sec(1000= 1 second).
and in our function move. their is condtion that check if our pos value is 150 or more than then perform clearInterval function ( clear function is used to stop setInterval )
and in else if we don't reach at 150 then add 1 into position and also add left 1pixel to position of box.
hope you understand

Answer 3

thanks a lot