Created
October 5, 2012 15:35
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NaN,Infinity trick
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| 1/0 = Infinity | |
| 0/0 = NaN | |
| 1/'foo' = NaN | |
| 1/Infinity = 0 | |
| (1/Infinity)*Infinity = NaN | |
| Infinity == Infinity (true) | |
| 0/0为NaN，其他数除0为Infinite |
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