如何检测一个变量是否存在?
qiu_923
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1#
发表于 2008-09-03 14:36
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qiu_923
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1#
发表于 2008-09-03 14:36
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ly5066113
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2#
发表于 2008-09-03 14:41
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forlorngenius
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3#
发表于 2008-09-03 14:42
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qiu_923
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4#
发表于 2008-09-03 14:43
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ly5066113
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5#
发表于 2008-09-03 14:46
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forlorngenius
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6#
发表于 2008-09-03 14:52
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flw
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7#
发表于 2008-09-03 15:01
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forlorngenius
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8#
发表于 2008-09-03 15:02
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churchmice
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9#
发表于 2008-09-03 15:05
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gambolabc
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10#
发表于 2008-09-03 15:41
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