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 () {
 
 }
})