即将离开知乎
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN#Confusing_special-case_behavior
您即将离开知乎,请注意您的帐号和财产安全。
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN#Confusing_special-case_behavior