jQuery Create Callback

Question

I'd like to create a callback on a simple function.

I have this function which is called on button click:

function main(){ };

So I'd like main(), when its done to call this:

 function test(){ }

Answer 1

function main(callback) {
    // ... do your thing
    callback();
}

main(function(){
    alert('this is the callback speaking');
});