Shulou(Shulou.com)06/01 Report--

This article will explain in detail how to check whether JavaScript is a number or not. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Check whether it is a number and whether the number of decimal places of the number is consistent with the parameter floats

Verification rules:

If the parameter floats has a value, check the number of digits after the decimal point.

If the parameter floats has no value, it is only checked whether it is a number.

Function isNum (value,floats=null) {

Let regexp = new RegExp (`^ [1-9] [0-9] *. [0-9] {${floats}} $| ^ 0. [0-9] {${floats}} $`)

Return typeof value = 'number' & & floats?regexp.test (String (value)): true

} function anysicIntLength (minLength,maxLength) {

Let result_str =''

If (minLength) {

Switch (maxLength) {

Case undefined:

Result_str = result_str.concat (`{${minLength-1}}`)

Break

Case null:

Result_str = result_str.concat (`{${minLength-1},}`)

Break

Default:

Result_str = result_str.concat (`{${minLength-1}, ${maxLength-1}}`)

}

} else {

Result_str = result_str.concat ('*')

}

Return result_str

} this is the end of the article on "how to check whether JavaScript is a number". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.