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This article mainly shows you "JavaScript how to check whether characters are pure numbers", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "JavaScript how to check whether characters are pure numbers" this article.

Check whether the character is a pure number (integer)

Verification rules:

Characters are all positive integers (including 0)

Can start with 0

Function pureNum (str) {

Return / ^ [0-9] * $/ .test (str)

} function anysicPunctuation (str) {

If (! str) return null

Let arr = str.split ('') .map (item = > {

Return item ='\\'+ item

});

Return arr.join ('|')

} function getPunctuation (str) {

Return anysicPunctuation (str) | |'\\ ~ |\\ `|\\! |\\ @ |\ |\ $|\% |\\ ^ |\\ * |\\ * |\\ (|\) |\\ |\ |\ + |\ = |\ | |\\: |\ |\\ |

} function getExcludePunctuation (str) {

Let regexp = new RegExp (`[${anysicPunctuation (str)}]`,'g')

Return getPunctuation ('~ `! @ # $% ^ & * ()-_ + =\ [] {};: "\', /? '.replace (regexp,''))

} the above is all the contents of the article "how to check whether characters are pure numbers in JavaScript". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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