当前位置：网站首页>(JS) isnan() method determines the reason why undefined is true

(JS) isnan() method determines the reason why undefined is true

2022-06-29 11:12:00 【Yu Cainiao, who asked not to be named】

Use isNaN() Judgment is not NaN when , This method is used Number() Method to make a conversion , Any non number is cast ,undefined Converted to NaN, So show true

console.log(isNaN(undefined)) //true

isNaN() Conversion except null And array types are converted to numbers 0 outside , Other non numeric types will be converted to NaN
character string 

console.log(isNaN("qigeyu")) //true

object 

console.log(isNaN({
    })) //true
原网站

版权声明
本文为[Yu Cainiao, who asked not to be named]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/180/202206290957112164.html

边栏推荐

猜你喜欢

随机推荐