微信小程序如何获取手机验证码

<view class='changeInfo'>
 <view class='changeInfoName'>
   <input placeholder='请输入姓名' bindinput='getNameValue' value='{{name}}'/> 
 </view>
 
 <view class='changeInfoName'>
   <input placeholder='请输入手机号' bindinput='getPhoneValue' value='{{phone}}'/> 
 </view>
 <view class='changeInfoName'>
   <input placeholder='请输验证码' bindinput='getCodeValue' value='{[code]}' style='width:70%;'/> 
   <button class='codeBtn' bindtap='getVerificationCode' disabled='{{disabled}}' >{{codename}}</button>
 </view>
 <button class='changeBtn' bindtap='save'>保存</button>
</view>

page{
 height: 100%;
 width: 100%;
 background: linear-gradient(#5681d7, #486ec3);
}
.changeInfo{
 display: flex;
 flex-direction: column;
 justify-content: space-between;
 width: 90%;
 margin: 50rpx auto;
}
.changeInfoName{
 position: relative;
 height: 80rpx;
 width: 100%;
 border-radius: 10rpx;
 background: #fff;
 margin-bottom: 20rpx;
 padding-left: 20rpx;
 box-sizing: border-box;
}
.codeBtn{
 position: absolute;
 right: 0;
 top: 0;
 color: #bbb;
 width: 30%;
 font-size: 26rpx;
 height: 80rpx;
 line-height: 80rpx;
}
.changeInfoName input{
 width: 100%;
 height:100%;
}
.changeBtn{
 width: 40%;
 height: 100rpx;
 background: #fff;
 color: #000;
 border-radius: 50rpx;
 position: absolute;
 bottom: 10%;
 left: 50%;
 margin-left: -20%;
 line-height: 100rpx;
}

var app = require('../../resource/js/util.js');
Page({
 /**
  * 页面的初始数据
  */
 data: {
  name:'',//姓名
  phone:'',//手机号
  code:'',//验证码
  iscode:null,//用于存放验证码接口里获取到的code
  codename:'获取验证码'
 },
 //获取input输入框的值
 getNameValue:function(e){
  this.setData({
   name:e.detail.value
  })
 },
 getPhoneValue:function(e){
  this.setData({
   phone:e.detail.value
  })
 },
 getCodeValue: function (e) {
  this.setData({
   code: e.detail.value
  })
 },
 getCode:function(){
  var a = this.data.phone;
  var _this = this;
  var myreg = /^(14[0-9]|13[0-9]|15[0-9]|17[0-9]|18[0-9])\d{8}$$/;
  if (this.data.phone == "") {
   wx.showToast({
    title: '手机号不能为空',
    icon: 'none',
    duration: 1000
   })
   return false;
  } else if (!myreg.test(this.data.phone)) {
   wx.showToast({
    title: '请输入正确的手机号',
    icon: 'none',
    duration: 1000
   })
   return false;
  }else{
   wx.request({
    data: {},
    'url': 接口地址,
    success(res) {
     console.log(res.data.data)
     _this.setData({
      iscode: res.data.data
     })
     var num = 61;
     var timer = setInterval(function () {
      num--;
      if (num <= 0) {
       clearInterval(timer);
       _this.setData({
        codename: '重新发送',
        disabled: false
       })
 
      } else {
       _this.setData({
        codename: num + "s"
       })
      }
     }, 1000)
    }
   })
   
  }
  
  
 },
 //获取验证码
 getVerificationCode() {
  this.getCode();
  var _this = this
  _this.setData({
   disabled: true
  })
 },
 //提交表单信息
 save:function(){
  var myreg = /^(14[0-9]|13[0-9]|15[0-9]|17[0-9]|18[0-9])\d{8}$$/;
  if(this.data.name == ""){
   wx.showToast({
    title: '姓名不能为空',
    icon: 'none',
    duration: 1000
   })
   return false;
  }
  if(this.data.phone == ""){
   wx.showToast({
    title: '手机号不能为空',
    icon: 'none',
    duration: 1000
   })
   return false;
  }else if(!myreg.test(this.data.phone)){
   wx.showToast({
    title: '请输入正确的手机号',
    icon: 'none',
    duration: 1000
   })
   return false;
  }
  if(this.data.code == ""){
   wx.showToast({
    title: '验证码不能为空',
    icon: 'none',
    duration: 1000
   })
   return false;
  }else if(this.data.code != this.data.iscode){
   wx.showToast({
    title: '验证码错误',
    icon: 'none',
    duration: 1000
   })
   return false;
  }else{
   wx.setStorageSync('name', this.data.name);
   wx.setStorageSync('phone', this.data.phone);
   wx.redirectTo({
    url: '../add/add',
   })
  }
 },
 /**
  * 生命周期函数--监听页面加载
  */
 onLoad: function (options) {
  
 },
 
 /**
  * 生命周期函数--监听页面初次渲染完成
  */
 onReady: function () {
 
 },
 
 /**
  * 生命周期函数--监听页面显示
  */
 onShow: function () {
 
 },
 
 /**
  * 生命周期函数--监听页面隐藏
  */
 onHide: function () {
 
 },
 
 /**
  * 生命周期函数--监听页面卸载
  */
 onUnload: function () {
 
 },
 
 /**
  * 页面相关事件处理函数--监听用户下拉动作
  */
 onPullDownRefresh: function () {
 
 },
 
 /**
  * 页面上拉触底事件的处理函数
  */
 onReachBottom: function () {
 
 },
 
 /**
  * 用户点击右上角分享
  */
 onShareAppMessage: function () {
 
 }
})