js代码实现点击按钮出现60秒倒计时 · 琉璃白的技术文档

**例子1：****Javascript 实现点击按钮倒计时60秒方可再次点击发送的效果** ``` <input type="button" id="btn" value="免费获取验证码" /> <script type="text/javascript"> var wait=60; function time(o) { if (wait == 0) { o.removeAttribute("disabled"); o.value="免费获取验证码"; wait = 60; } else { o.setAttribute("disabled", true); o.value="重新发送(" + wait + ")"; wait--; setTimeout(function() { time(o) }, 1000) } } document.getElementById("btn").onclick=function(){time(this);} </script> ``` **例子2：****点击按钮出现60秒倒计时js代码** ~~~html <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <script type="text/javascript" src="js/jquery.js"></script> </head> <body> <input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" /> <script type="text/javascript"> var countdown=60; function settime(val) { if (countdown == 0) { val.removeAttribute("disabled"); val.value="免费获取验证码"; countdown = 60; } else { val.setAttribute("disabled", true); val.value="重新发送(" + countdown + ")"; countdown--; } setTimeout(function() { settime(val) },1000) } </script> </body> </html> ~~~