Actionscript 3 Entwicklerhandbuch

ACTIONSCRIPT 3.0 ENTWICKLERHANDBUCH
Verwenden der nativen JSON-Funktionalität
// over that object's properties to construct a fresh dictionary).
//
// The harder exercise is to handle situations where the dictionaries
// themselves are nested in the object passed to JSON.stringify and
// thus does not occur at the topmost level of the resulting string.
//
// (For example: consider roundtripping something like
// var tricky_array = [e1, [[4, e2, 6]], {table:e3}]
// where e1, e2, e3 are all dictionaries. Furthermore, consider
// dictionaries that contain references to dictionaries.)
//
// This parsing (or at least some instances of it) can be done via
// JSON.parse, but it's not necessarily trivial. Careful consideration
// of how toJSON, replacer, and reviver can work together is
// necessary.
var e_roundtrip =
JSON.parse(e_result,
// This is a reviver that is focused on rebuilding JSONDictionaryExtnExample objects.
function (k, v) {
if ("class JSONDictionaryExtnExample" in v) { // special marker tag;
//see JSONDictionaryExtnExample.toJSON().
var e = new JSONDictionaryExtnExample();
var contents = v["class JSONDictionaryExtnExample"];
for (var i in contents) {
// Reviving JSONGenericDictExample objects from string
// identifiers is also special;
// see JSONGenericDictExample constructor and
// JSONGenericDictExample's revive() method.
e[JSONGenericDictExample.revive(i)] = contents[i];
}
return e;
} else {
return v;
}
});
trace("// == Here is an extended Dictionary that has been round-tripped ==");
trace("// == Note that we have revived Jen/Jan during the roundtrip. ==");
trace("e: " + e); //[JSONDictionaryExtnExample ]
trace("e_roundtrip: " + e_roundtrip); //[JSONDictionaryExtnExample ]
trace("Is e_roundtrip a JSONDictionaryExtnExample? " + (e_roundtrip is
JSONDictionaryExtnExample)); //true
trace("Name change: Jen is now Jan");
a_jen.dname = "Jan"
trace("e: " + e); //[JSONDictionaryExtnExample ]
trace("e_roundtrip: " + e_roundtrip); //[JSONDictionaryExtnExample ]
Letzte Aktualisierung 27.6.2012
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