最近有个bug，改了以后，加了一个字符串，造成了这个字符串的值为0，记录下，提醒下，要严格判断类型！
什么情况啊
2+”’33″ = 2 2+’33′ = 35
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August 5th, 2010 - 20:45
什么情况啊
August 8th, 2010 - 02:20
2+”’33″ = 2
2+’33′ = 35