"あa".toJSON() JSON.stringify("あa") JSON.stringify({"あa": null}) Google Chrome6(dev) "あa" ""\u3042a"" "{"\u3042a":null}" Safari5 not impl ""あa"" "{"あa":null}" Opera10.60β not impl '"あa"' '{"あa":null}' Firefox3.6.3 "あa" ""あa"" "{"あa":null}" IE8 "あa" ""\u3042a"" "{"\u3042a":null}" IE6, IE7 not impl not impl not impl JSON.parse('"あa"') JSON.parse('"\u3042a"') Google Chrome6(dev) "あa" "あa" Safari5 "あa"