setInterval and [removed] problem

Question

I have this code

window.onload = function() {            
    function foo() {
        alert(\"test\");
    }
    setInterval(\"foo()\",500)
}

Answer 1

Using a string command in setInterval() will try to look for the function in the global (window) scope, but since the function is defined in a local scope, it won't be found. You should pass the function itself to setInterval() instead.

window.onload = function() {            
    function foo() {
        alert("test");
    }
    setInterval(foo, 500);
}