js,获取验证码按钮,验证码倒计时效果效果图： 
图（1）初始图 
图（2）点击后 代码如下： <!DOCTYPE HTML><html><head><meta charset="UTF-8" /><title>pro.html</title><style type="text/css">.checkCode { cursor: pointer; border: 1px solid black; text-align: center; line-height: 26px; width: 115px; height: 35px;}</style><script type="text/javascript"> var sleep = 30, interval = null; window.onload = function () { var btn = document.getElementById ('btn'); btn.onclick = function () { if (!interval) { this.style.backgroundColor = 'rgb(243, 182, 182)'; this.disabled = "disabled"; this.style.cursor = "wait"; this.value = "重新发送 (" + sleep-- + ")"; interval = setInterval (function () { if (sleep == 0) { if (!!interval) { clearInterval (interval); interval = null; sleep = 30; btn.style.cursor = "pointer"; btn.removeAttribute ('disabled'); btn.value = "免费获取验证码"; btn.style.backgroundColor = ''; } return false; } btn.value = "重新发送 (" + sleep-- + ")"; }, 1000); } } }</script></head><body> <input class="checkCode" type="button" id="btn" value="免费获取验证码" /></body></html>以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持wanshiok.com！
js,获取验证码按钮,验证码倒计时效果
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