NaN 等于 NaN 吗? [英] Is NaN equal to NaN?
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问题描述
parseFloat("NaN")
返回NaN"，但是
parseFloat("NaN") == "NaN"
返回假.现在，它确实返回 false 可能是一件好事，但我不明白这是怎么回事.JavaScript 创建者是否只是将其作为特例?因为否则我无法理解这是如何返回 false 的.
returns false. Now, that's probably a good thing that it does return false, but I don't understand how this is so. Did the JavaScript creators just make this a special case? Because otherwise I can't understand how this returns false.
推荐答案
当 JavaScript 函数返回 NaN 时，这不是文字字符串，而是全局空间中的对象属性.您不能将其与字符串 "NaN" 进行比较.
When a JavaScript function returns NaN, this is not a literal string but an object property in the global space. You cannot compare it to the string "NaN".
参见 https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/NaN
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