I don't know what the rest of your code looks like, but you can see this kind of behavior due to "shadowing":
var q = 0; //global "q"
function handler() {
var q = 0; //local "q" that shadows the global "q";
...
...
q++;
console.log(q);
}
Repeatedly calling handler
will output 1
each time since you are redefining a local q
within handler
. However, the outer q
remains unchanged. But if you did this:
var q = 0; //global "q"
function handler() {
var q = 0; //local "q" that shadows the global "q";
...
...
window.q++;
console.log(window.q);
}
The global q
will be updated since you are explicitly referencing it by doing window.q
.