function settime(obj) { ???if(second == 0){ ???????obj.removeAttribute("disabled"); ????????obj.value="获取验证码"; ????????second = 300; ????????return; ???}else{ ???????obj.setAttribute("disabled", true); ????????obj.value="重新发送(" + second + ")"; ????????second--; ????}timeId = window.setTimeout(function(){settime(obj)},1000);};obj参数传入this即可。
js 验证码倒计时效果
原文地址：https://www.cnblogs.com/qiaoyutao/p/10155579.html