>html ~~~ <button id="click">发送验证码</button> ~~~ >js ~~~ document.getElementById('click').onclick = function(){ settime(this); } var countdown = 60; function settime(obj) { if (countdown == 0) { obj.removeAttribute("disabled"); obj.innerHTML = "获取验证码"; countdown = 60; return; } else { obj.setAttribute("disabled", true); obj.innerHTML = "重新发送(" + countdown + ")"; countdown--; } setTimeout(function () { settime(obj) }, 1000) } ~~~