//NaN and isNaN(). //. // NaN is a property of the global object. // it represents a value which is Not A Number. // it will be unequal !== to ANYTHING ... ... <看更多>

isNaN 與Number.isNaN，兩個方法是不同的，NaN 是非數值資料的表示，而這兩個方法都是判斷資料是否非數值，isNaN 是比較早期的方法，所以有許多特別的 ... ... <看更多>

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, we ... ... <看更多>

Number isNaN JavaScript. The number isNaN is a perfect tool for javascript programmers to debug and double check variables if the variable ... ... <看更多>

The global property NaN represents any value that is Not A Number.The global isNaN method allows you to check whether or not any value is ... ... <看更多>

And JavaScript number has a special value called NaN , which stands for Not-a–Number. ... And the global object in Node.js. global.NaN ... ... <看更多>

However, when you try to use isNaN on a value which is not a floating-point number, Javascript first tries to convert it to a number and ... ... <看更多>