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Editor to share with you how to achieve function encapsulation random color verification code in JavaScript, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

The random color of a numeric or alphanumeric or numeric-alphanumeric n-bit verification code.

Function verify (a = 6 if b = "num") {/ / define three random CAPTCHA verification code libraries var num = "0123456789" var str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNIPQRSTUVWXYZ" var mixin = num + str; / / define an empty string to store the CAPTCHA var verify= "" if (a = = undefined | | b = = undefined) {/ / validate whether the input is valid and throw an exception throw new Error ("parameter exception") } else {if (a = "" | | bounded = "") {/ / determine whether the user has not entered throw new Error ("illegal parameter.");} else {/ / detect the type of input to determine whether to enter var typea = typeof (a); var typeb = typeof (b) If (typea = = "number" & & typeb = = "string") {if (b = = "num") {/ / define a loop to receive the CAPTCHA pure numeric CAPTCHA for (var iCAPTCHA code for)

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