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To invoke a javascript function, you assign it variable - thus making it an object. Like so: let x = MyFunction();.
To call a javascript function, you simply call it in code like so: MyFunction();.
To make a reference to a function, you simply use it's name: var myPointer = MyFunction.
In JavaScript there, is always a default global object. In HTML the default global object is the HTML page itself, so
the function above "belongs" to the HTML page.
In a browser, the page object is the browser window. The function above automatically becomes a window function. myFunction() and window.myFunction() is the same function.