Changing a global variable with setInterval

Asked Jan 12 '16 at 18:03

Active Jan 12 '16 at 18:03

Viewed 37 times

How can I change the global variable a every second using setInterval?

Tried this, but it not works as it will reset a's value when leaving setInterval.

var a=1;
var timerId = setInterval(function(){ 
     a++; 
     alert(a);
     if (a == 5) clearInterval(timerId);
}, 1000);
document.write(a);

Eventually, is there any better way to do it, other than setInterval?

asked Jan 12 '16 at 18:03

neptune

2

That's working just fine, it's just that the `setInterval` is **asynchronous**, so the document.write happens even before the interval starts – adeneo Jan 12 '16 at 18:05
As adeneo said. It works fine: https://jsfiddle.net/w4mryc91/ – AtheistP3ace Jan 12 '16 at 18:08
@adeneo you seems to be right: https://jsfiddle.net/yscvf8t1/ – neptune Jan 12 '16 at 19:35

0 Answers0