点击获取验证码效果

 1 var Btn = document.getElementById(‘btn‘);
 2         var star = 10;
 3 
 4         Btn.onclick = function(){
 5             var timer = setInterval(function(){
 6                 star--;
 7                 Btn.disabled = true;
 8                 Btn.innerHTML = "重新发送验证码" + "(" + star + ")";
 9                 console.log(star);
10                 if(star <= 0){
11                     Btn.innerHTML = "获取短信验证码";
12                     Btn.disabled = false;
13                     clearInterval(timer);
14                 }
15             }, 1000);
16         }