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

In all browsers, window is the javascript global namespace. Every property or method 'lives' in that namespace. So if you assign a property to window, it is in effect a global variable.

example:

window.myConstant = 5;

function multiply(val){
  return myConstant * (val || 1);
}
multiply(10); //=> 50
multiply(); //=> 5

You have to be cautious with javascript frameworks. For instance, if you declare window.JQuery, and use the JQuery framework, the JQuery namespace will be replaced by your assignment, rendering it useless.