How to check if JavaScript is a number
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.
