点击按钮出现60秒倒计时，JS（按钮）

 1 <script type="text/javascript">
 2         var countdown=60;
 3         function settime(val) {
 4             var e = $('#email').val();
 5             //对电子邮件的验证
 6             var myreg = /^([a-zA-Z0-9]+[_|\_|.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|.]?)*[a-zA-Z0-9]+.[a-zA-Z]{2,3}$/;
 7             if(!myreg.test(e))
 8             {
 9                 return;
10             }
11             if (countdown == 0) {
12                 val.removeAttribute("disabled");
13                 val.value="获取验证码";
14                 countdown = 60;
15                 return;
16             } else {
17                 val.setAttribute("disabled", true);
18                 val.value="重新发送(" + countdown + ")";
19                 countdown--;
20             }
21             setTimeout(function() {
22                 settime(val)
23             },1000)
24         }
25     </script>