微信小程序实例：如何验证码的倒计时计数（代码）

// pages/login/login.js
const app = getApp()
Page({

  /**
   * 页面的初始数据
   */
  data: {
    countdown: 60,
    isShow:true
  },
  //倒计时
  count:function(that){
    var interval = setInterval(function () {
      var countdown = that.data.countdown;
      if (countdown == 0) {
        that.setData({
          isShow: true,
          countdown: 60
        })
        clearInterval(interval)
      } else {
        countdown--;
        that.setData({
          isShow: false,
          countdown: countdown
        })
      }
    }, 1000)
  },
  //设置手机号
  shj: function (e) {
    this.setData({
      tel: e.detail.value
    })
  },
  //获取验证码
  send: function () {
    var that=this;
    wx.showToast({
      title: '验证码发送成功',
      icon: 'none',
      duration: 1000,
      success: function () {
        that.count(that)
      }
    })
  }, 
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    
  },

})