亚洲三级香港三级久久,999久久久无码国产精品

                        課程
                    
                        /前端開發(fā)
                        
                            /JavaScript
                        
                        /Tab選項卡切換效果

<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script type="text/javascript">
    window.onload=function(){
        var send=document.getElementById('send'),
            times=60,
            timer=null;
        send.onclick=function(){
          // 計時開始 
          send.value=''+times+'秒后重試'
          clearInterval(timer);
          timer = setInterval(function(){

              if(times > 0){
                  times--;
              send.value=''+times+'秒后重試'
              }else{
                  clearInterval(timer);
                  send.value='發(fā)送驗證碼';
              }
          },1000)


 




         
        } 
    }
    </script>
</head>
<body>
    <input type="button" id="send" value="發(fā)送驗證碼">
</body>
</html>