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Asked: 2026-06-01T06:56:26+00:00

I’ve read about the technical differences such as which option waits for the appropriate

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I’ve read about the technical differences such as which option waits for the appropriate elements to load, but for most cases I understand that they both serve a similar purpose.

I’d like to know about the rationale behind needing to call the function (say, initialize();) when using but only using the function name if writing window.onload=myFunction. (MDN calls it a handler function). Here, I’m referring to the difference being the missing parentheses.

Is there an advantage to either approach? A technical reason?

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1 Answer

  1. Editorial Team

    It’s the difference between HTML markup and the Document Object Model that Javascript uses. When you run:

    window.onload = fn;

    That is setting the property “onload” to that function object, which is to handle the event. If on the other hand, you wrote:

    window.onload = fn();

    that would execute fn immediately, and set the onload property to whatever value the function returns (which could also work, if the function fn returned another function).

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