How to realize CAPTCHA countdown by JavaScript

This article Xiaobian for you to introduce in detail "JavaScript how to achieve CAPTCHA countdown", the content is detailed, the steps are clear, the details are handled properly, I hope this "JavaScript how to achieve CAPTCHA countdown" article can help you solve your doubts, following the editor's ideas slowly in depth, together to learn new knowledge.

JavaScript implements the CAPTCHA countdown by first creating a HTML sample file, then creating a button; and finally obtaining the CAPTCHA through the "$('hmac'). On ('click',function () {...}" method and realizing the 60-second countdown.

This article operating environment: windows7 system, javascript1.8.5 version, Dell G3 computer.

How does JavaScript realize CAPTCHA countdown?

60 seconds countdown to js acquisition of CAPTCHA (ultra-simple)

Test the ajax method of jquey * {padding:0; margin:0;} button {width: 20% click',function height: 50px var timeo height: 50px this var timeo size: 30px dextrose left: 40% dextrin top: 20%;} get the verification code $('hmac'). Verification () {var that = $(this) height = 60 Var timeStop = setInterval (function () {timeo--; if (timeo > 0) {that.text ('resend' + timeo +'s'); that.attr ('disabled','disabled'); / / No clicking} else {timeo = 60 timeo / 60 that.text when reduced to 0 (' get CAPTCHA') ClearInterval (timeStop); / / clear timer that.removeAttr ('disabled') / / remove attributes, you can click}}, 1000)}) read here, this article "how to achieve CAPTCHA countdown" article has been introduced, to master the knowledge of this article, you still need to practice and use to understand, if you want to know more related articles, welcome to follow the industry information channel.