发送验证码倒计时

var code = $('.j-send-verifycode'); //点击发送验证码按键

code.attr("disabled","disabled"); 

setTimeout(function(){

code.css({"opacity":"0.8","width":"107px","left":'340px'}); //根据需求设置样式

},200);

var time = 120;

var set=setInterval(function(){

code.val("("+--time+")秒后重新获取");

}, 1000); 

setTimeout(function(){

code.attr("disabled",false).val("重新获取");

clearInterval(set);

}, 120000);

来源：https://www.cnblogs.com/qiuqiunile/p/11341857.html