微信小程序倒计时功能实现代码

//倒计时60秒
function countDown(that,count) {
 if (count == 0) {
 that.setData({
  timeCountDownTop: '获取验证码',
  counting:false
 })
 return;
 }
 that.setData({
 counting:true,
 timeCountDownTop: count + '秒后重新获取',
 })
 setTimeout(function(){
 count--;
 countDown(that, count);
 }, 1000);
}

Page({
 data:{
  counting:false
 },
 //生成验证码
 generateVerifyCode:function() {
  var that = this;
  if (!that.data.counting) {
   wx.showToast({
   title: '验证码已发送',
   })
   //开始倒计时60秒
   countDown(that, 60);
  } 
 },
})

setTimeout(function(){
 count--;
 countDown(that, count);
 }, 1000);