String For Field Name In Javascript Object Literals

I have a question regarding field names in js object literals. I have a function test that looks like this: function test() { var o1 = {f1:'Hello'}; var o2 = {'f1':'Hello'}

Solution 1:

My question is, what is the difference between the two objects?

They are identical.

Is there a difference between quoting the field name and not?

Quoted property names can be things which are not valid identifiers.

e.g. { "foo-bar": 1 } is fine but { foo-bar: 1 } is a syntax error.