setInterval does not repeat

Question

I’m trying to solve the following problem:

On my page, the setInterval does not repeat, I tried several ways, until simplify in the mode below to see if it would work, but even so it does not repeat, is working as a setTimeout.

function teste(){
    $("#teste").append("a");
 }
 var x = setInterval(teste(),1000);

Answer 1

The problem is that you are passing the function result teste to the setInterval.

setInterval(teste(), 1000);
// 'teste' é executado, e, como ele não retorna nada, essa linha é equivalente a:
setInterval(undefined, 1000);

Finally, to tidy up, pass the reference to the function teste to the setInterval. Tidy code:

function teste(){
    $("#teste").append("a");
}
var x = setInterval(teste, 1000); // <-- sem parênteses

Jsfiddle