<style>button{  background: #45BCF9;  color: #fff;  padding: 4px 10px;  border: none;  outline: none;  cursor: pointer;}button:hover{  background: #00a8fe;}button.disabled{  background: #000;  cursor: auto;}button.disabled:hover{  background: #000;}</style><button type="button" onclick="fn()">獲取驗證碼</button><script>function fn(){  var oBtn = document.getElementsByTagName('button')[0];  var time = 60;  var timer = null;  oBtn.innerHTML = time + '秒后重新發送';  oBtn.setAttribute('disabled', 'disabled');  // 禁用按鈕  oBtn.setAttribute('class', 'disabled');   // 添加class 按鈕樣式變灰  timer = setInterval(function(){    // 定時器到底了 兄弟們回家啦    if(time == 1){      clearInterval(timer);             oBtn.innerHTML = '獲取驗證碼';        oBtn.removeAttribute('disabled');       oBtn.removeAttribute('class');      }else{      time--;      oBtn.innerHTML = time + '秒后重新發送';    }  }, 1000)}</script>