How to write isNumber() in JavaScript?

2018-06-08 17:55:29

This question already has an answer here:

Validate decimal numbers in JavaScript - IsNumeric() 48 answers

function isNumber(val){
    return typeof val==='number';
}

If I needed to write an isNumber function for an API I would use:

function isNumber(val) {
    return !isNaN(val);
}

...but I wouldn't bother writing an isNumber function, as I'd just use isNaN .

如果你想让"23"成为一个数字，那么

function isNumber(val) {
    return !isNaN(val);
}

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