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<!DOCTYPE html><html><head><script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script><script type="text/javascript"> var countdown=60; function settime(obj) { if (countdown == 0) { obj.removeAttribute("disabled"); obj.value="免费获取验证码"; countdown = 60; return; } else { obj.setAttribute("disabled", true); obj.value="重新发送(" + countdown + ")"; countdown--; } setTimeout(function() { settime(obj) } ,1000) }</script><body> <input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" /> </body></html>标签：
原文地址：http://www.cnblogs.com/family-626-77/p/5430638.html
