Can I add attributes to 'window' object in javascript?

Question

Can I add any random attribute to \'window\' object in javascript? Some thing like:

window.my_own_attr = \"my_value\"

Does it have any side

Answer 1

Yes, you can, but in general you shouldn't.

The window object is also the JS default "global" object, so all global variables get added there.

You're unlikely to break anything unless you overwrite a property that's already there, but it's considered bad practise to dump variables on window, or otherwise create lots of global variables.