基于JavaScript实现手机短信按钮倒计时(超简单)

 /* 120秒手机短信按钮倒计时 */ exports.sendmessage = function (name) {  var second = 120;  $(name).attr("disabled", true);  var color = $(name).css('background-color');  $(name).attr("style", "background-color : #c1c1c1");  function update(num) {   if (num == second) {    $(name).attr("style", "background-color : "+color);    $(name).text("获取验证码");    $(name).attr("disabled", false);   }   else {    var printnr = second - num;    $(name).text(printnr + "秒后获取");   }  }  function uupdate(i) {   return function () {    update(i);   }  }  for (var i = 1; i <= second; i++) {   setTimeout(uupdate(i), i * 1000);  } }