var someObj = {

  someProperty: 'some value from the object'

};

console.log(someObj.someProperty); //logs "123"

​

var someFunction = function() {

​

};

someFunction.someProperty = 'value from property added the function';

console.log(someFunction.someProperty); //logs "123"

​

someFunction.prototype.someProperty = 'inherited value!';

var foo = new someFunction();

console.log(foo.someProperty); //logs "123"

​