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Possible Duplicate:
What is the difference between object keys with quotes and without quotes?
What is the difference between a and b as below?
var a = {foo : "bar"};
var b = {"foo" : "bar"};
There is no difference.
A key in an object literal can be an identifier or a string literal. You can use characters in a string that you can’t use in an identifier, but
foodoesn’t contain any of those.(As an aside, if you were writing JSON rather than JS, then the key would have to be a string)