微信小程序实现发送短信验证码倒计时

<view class="container">
  <view class="userinfo">
    <image class="userinfo-avatar" src="../../images/timg.jpg" mode="cover"></image>
    <text class="userinfo-nickname">什么</text>
  </view>
  <view class="wrap">
    <view class="tel">
      <input type="number" bindinput="bindtelinput" maxlength="11" 
         placeholder="请输入手机号"
         placeholder-style="color:#c3c6c4;"/>
    </view>
    <view class="ver-code">
      <view class="code">
        <input type="number" bindinput="bindcodeinput" maxlength="6"
               placeholder="请输入验证码"
               placeholder-style="color:#c3c6c4;"/>
      </view>
      <view class="getcode" bindtap="getcode" wx:if="{{countdownnum == 60 || countdownnum == -1}}">
        <button type="primary" plain="true">获取验证码</button>
      </view>
      <view class="getcode" wx:else>
        <button type="primary" plain="true">{{countdownnum}}s后重新获取</button>
      </view>
    </view>
  </view>
  <view class="btn-login" bindtap="login">登录</view>
</view>

//获取应用实例
const app = getapp()

page({

  /**
   * 页面的初始数据
   */
  data: {
    phone: null, // 手机号
    code: null, // 手机验证码
    countdownnum: 60, // 倒计时初始值
  },

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

  },

  /**
   * 生命周期函数--监听页面显示
   */
  onshow: function () {
    
  },
  
  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onready: function () {

  },
  
  /**
   * 用户点击右上角分享
   */
  onshareappmessage: function () {

  },
  // 输入手机号
  bindtelinput: function (e) {
    this.setdata({
      phone: e.detail.value
    })
  },
  // 输入验证码
  bindcodeinput: function (e) {
    this.setdata({
      code: e.detail.value
    })
  },
  // 发送手机验证码
  getcode: function () {
    if (!!this.data.phone) {
      if (!!(/^1[34578]\d{9}$/.test(this.data.phone))) {
        wx.showtoast({
          title: "发送成功",
          icon: "none",
          duration: 1500
        })
        this.countdown()
      } else {
        wx.showtoast({
          title: "请输入正确的手机号",
          icon: "none",
          duration: 1500
        })
      }
    } else {
      wx.showtoast({
        title: "请输入手机号",
        icon: "none",
        duration: 1500
      })
    }
  },
  /**
   * 验证码倒计时
   */
  countdown: function () {
    var _this = this
    var countdownnum = _this.data.countdownnum // 获取倒计时初始值
    var timer = setinterval(function () {
      countdownnum -= 1
      _this.setdata({
        countdownnum: countdownnum
      })
      if (countdownnum <= -1) {
        clearinterval(timer)
        // 取消置顶的setinterval函数将要执行的代码
        _this.setdata({
          countdownnum: 60
        })
      }
    }, 1000)
  },
  // 手机验证码登录
  login: function () {
    if (this.data.phone) {
      if (!!(/^1[34578]\d{9}$/.test(this.data.phone))) {
        if (this.data.code) {
          wx.showtoast({
            title: "登录成功",
            icon: "none",
            duration: 1500
          })
        } else {
          wx.showtoast({
            title: "请输入验证码",
            icon: "none",
            duration: 1500
          })
        }
      } else {
        wx.showtoast({
          title: "请输入正确的手机号",
          icon: "none",
          duration: 1500
        })
      }
    } else {
      wx.showtoast({
        title: "请输入手机号",
        icon: "none",
        duration: 1500
      })
    }
  }
})

.userinfo {
  height: 240rpx;
  margin: 40rpx auto 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.userinfo .userinfo-avatar {
  width: 140rpx;
  height: 140rpx;
  margin: 20rpx;
  border-radius: 50%;
  border: 1rpx solid #dad5d5;
}

.userinfo .userinfo-nickname {
  color: #aaa;
}

.wrap {
  width: 630rpx;
  font-size: 32rpx;
  margin: 80rpx auto 120rpx;
}

.wrap .tel {
  width: 100%;
  height: 68rpx;
  border-bottom: 1rpx solid #dde3ec;
  margin-bottom: 60rpx;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.wrap .ver-code {
  width: 100%;
  height: 68rpx;
  border-bottom: 1rpx solid #dde3ec;
  display: flex;
  justify-content: space-between;
}

.wrap .ver-code .code {

}

.wrap .ver-code .getcode {
  min-width: 190rpx;
  height: 40rpx;
}

.wrap .ver-code .getcode button {
  width: 100%;
  height: 100%;
  font-size: 28rpx;
  font-weight: normal;
  line-height: 40rpx;
  background: #fff;
  color: #ffaa7f;
  border: none;
  padding: 0;
  margin: 0;
}

.btn-login {
  width: 588rpx;
  height: 88rpx;
  background: #ffaa7f;
  border-radius: 10rpx;
  text-align: center;
  line-height: 88rpx;
  font-size: 36rpx;
  font-weight: 500;
  color: #fff;
  margin: 0 auto;
}

.clickclass {
  background: #ea986c;
}