JS设置手机验证码60s等待实现代码

<div class="input">  <input class="tel input_all" type="text" name="tel" placeholder="手机号"></div><div class="input huoqu">  <input class="yzm input_all" type="text" name="code" placeholder="验证码">  <button class="btn1">获取验证码</button></div><span class="error"></span>

var btn1 = document.querySelector('.btn1');var tel = document.querySelector('.tel');var error = document.querySelector('.error');var time = 60;btn1.onclick = function(){  var name = tel.value;    if (name == "") {    error.innerHTML='手机号不能为空!';    return;  }   else {    if (!(/^1[3|4|5|7|8]/d{9}$/.test(name))) {      error.innerHTML='手机号格式有误.';       return;    }  }  var timer = setInterval(function(){        time--;    btn1.innerHTML = time + "秒";    btn1.disabled = true;    if (time==0) {      time = 60;      clearInterval(timer);       btn1.innerHTML = "获取验证码";      btn1.disabled = false;    }  },1000);}