JavaScript Determine if dynamically named function exists

Question

How can I check if a dynamically named object or function exists?

In example:

var str = \'test\';
var obj_str = \'Page_\'+str;

function Pag         


        

Answer 1

if you run your code in browser, just access global object by window, your code may like this:

if (typeof window[obj_str] === 'string') {
    alert('ok');
}

otherwise, you should gain access to global object:

var global = function() { return this; }() || (1,eval)('this');
if (typeof global[obj_str] === 'stribg