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1、{["a","b","c"],["d","e","f"],["g","h","i"]}
2、{"1":{["a","b","c"],["d","e","f"],["g","h","i"]}}
3、{{"1":["a","b","c"]},{"2":["d","e","f"]},{"3":["g","h","i"]}}
alert([["a","b","c"],["d","e","f"],["g","h","i"]][0][0])