NaN in JavaScript stands for "Not A Number", although its type is actually number. typeof(NaN) // "number". To check if a variable is of value NaN, ... ... <看更多>

NaN 不大於、不小於也不等於任何值，包含NaN 它自己。 isNaN 與 Number.isNaN. 要如何檢測運算結果是否為有效的數字呢？那麼就來檢測是否為 ... ... <看更多>

Introduction to JavaScript NaN ... JavaScript has the number type that allows you to represent numbers including integer and floating-point numbers. And ... ... <看更多>

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... a behavior change: https://github.com/airbnb/javascript/blob/master/packages/eslint-config-airbnb-base/rules/best-practices.js#L231... ... <看更多>