(![] + [])[+ []] ...解释为什么会这样alert((![]+[])[+[]]+(![]+[])[+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]);此代码的输出是:fail。为什么?顺便说一句(![]+[])[+!+[]] == 'false'[1],对吗?但为什么![]+[] == "false"和为什么+!+[] == 1?
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