How does JavaScript verify that it is an IP address without port number

This article mainly introduces how JavaScript checks whether it is an IP address without a port number. It has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

Verify that it is an IP address without a port number

Verification rules:

IP format is xxx.xxx, and the value range of each item is 0-255.

Numbers other than 0 cannot begin with 0, such as 02.

function isIP(str) {

return /^((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]? [0-9])\.) {3}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]? [0-9])$/.test(str);

JavaScript is a literal scripting language, its interpreter is called JavaScript engine, is part of the browser, JavaScript is widely used in client-side scripting language, first used in HTML web pages, used to add dynamic features to HTML web pages.

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