微信小程序实现验证码倒计时效果

效果图

wxml

<input class='input-pwd' placeholder="新密码" placeholder-style='color: #000' password focus bindconfirm='getPwd'/>
<input class='input-tel' type='number' placeholder="手机号" placeholder-style='color: #000' maxlength='11 confirm-type='done' />
<input class='input-verify' type='number' placeholder-style='color: #000' placeholder='手机验证码'></input>
<button class='verify-btn' disabled='{{disabled}}' bindtap="getVerificationCode">{{time}}</button>

<button class='confirm-btn' bindtap='confirm_btn'>确认修改</button>

wxss

/* pages/forgetpwd/forgetpwd.wxss */
input{
  padding-left: 20rpx;
  border-bottom: 1rpx solid #ccc;
  height: 80rpx;
  line-height: 80rpx;
  width: 95%;
  margin: 0 auto;
  font-size: 28rpx;
}
.input-verify{
  width: 67%;
  margin-left: 10rpx;
  float: left;
}
.verify-btn{
  width: 26%;
  height: 65rpx;
  float: right;
  line-height: 65rpx;
  background: #fff;    
  color: #5FD79D;
  margin: 20rpx 10rpx;
  font-size: 28rpx;
}
.confirm-btn{
  width: 80%;
  height: 90rpx;
  margin: 150rpx auto;
  background: #5FD79D;    
  color: #fff;
}

js

// pages/forgetpwd/forgetpwd.js
var interval = null //倒计时函数
Page({

  /**
   * 页面的初始数据
   */
  data: {
    time: '获取验证码', //倒计时 
    currentTime: 60
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {

  },

  getPwd:function(e){
    console.log(e.detail.value)
  },

  /**
   * 确认修改
   */
  confirm_btn:function(){
    wx.redirectTo({
      url: '/pages/login/login',
    })
  },
  
  getCode: function (options){
    var that = this;
    var currentTime = that.data.currentTime
    interval = setInterval(function () {
      currentTime--;
      that.setData({
        time: currentTime+'秒'
      })
      if (currentTime <= 0) {
        clearInterval(interval)
        that.setData({
          time: '重新发送',
          currentTime:60,
          disabled: false   
        })
      }
    }, 1000)  
  },
  getVerificationCode(){
    this.getCode();
    var that = this
    that.setData({
      disabled:true
    })
  },
})