【原生js】原生js实现验证码短信发送倒计时

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><!--强制以webkit内核来渲染-->

     <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no">

     <!--按设备宽度缩放，并且用户不允许手动缩放-->

     <meta name="format-detection" content="telephone=no"><!--不显示拨号链接-->

     <title>非会员未关注</title>

     <link rel="stylesheet" href="css/common.css">

     <link rel="stylesheet" href="css/registered.css">

 </head>

 <body>

     <div class="main">

         <div class="top"></div>

         <div class="form">

             <input type="text" placeholder="请输入您的手机号">

             <div class="yzm">

                 <input type="text" class="left"><span class="right getCode">获取验证码</span>

             </div>

             <div class="btn-xiadan">注册并下单</div>

         </div>

     </div>

     <script>

         function getClass(className) {

             return document.getElementsByClassName(className)[0];

         }

         var getCode=getClass('getCode');

         var countdown={

             timeAll:30,

             state:true,

             //计时器

             clickFun:function (domName) {

                 countdown.state=false;

                 var time=setInterval(function () {

                     domName.innerText="剩余"+countdown.timeAll+"秒";

                     domName.style.backgroundColor="grey";

                     countdown.timeAll=countdown.timeAll-1;

                     if(countdown.timeAll==-1){

                         clearInterval(time);

                         domName.innerText="获取验证码";

                         domName.style.backgroundColor="#f54339";

                         countdown.timeAll=5;

                         countdown.state=true;

                     }

                 },1000)

             }

         };

         getCode.addEventListener('touchstart',function () {

             //防止点击以后还可以继续点击生效加快计时,通过state来判断是否可点击

             if(countdown.state){

                 countdown.clickFun(getCode);

             }

         },false);

     </script>

 </body>

 </html>
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【原生js】原生js实现验证码短信发送倒计时

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