JS 百題斬
J
Nothing is true, everything is permitted.
1. 減數字字串，會轉回數字型別
2.
3. b 會省略後面不是數字的字串，所以是 15
(如果說 parseInt 碰上了無法被 radix 指定的進位制所轉換的字元，它會忽略該字元、以及其後所有字元)
4.
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