在infocenter.vue中发送修改的用户信息，在得到res后，向data中赋值改变，
会报错说data中的东西未定义！第一次碰到这种情况，也不知道怎么解决。

vue中159行开始

<template>
    <div id="infocenter">
        <!-- 头部标题栏 -->
        <HeadTop title="个人信息中心">
            <span slot="left">
                <div @click="routerback">
                    <Icon type="md-arrow-round-back" size="20" /><span>返回</span>
                </div>
            </span>
            <span slot="right"></span>
        </HeadTop>

        <!-- 内容 -->
        <div>
          <div class="upload">
            <!-- 个人信息 -->
            <div style="width:280px;margin:0 auto;text-align:center;">
              <!-- 展示用户信息，可以修改 -->
              <div v-if="showInfo">
                <Form :model="info" label-position="right" :label-width="100">
                    <img :src="this.info.avatarurl" width="60" height="60"/>
                    <FormItem label="昵称:"  style="text-align:left;">
                        {{this.info.username}}
                    </FormItem>
                    <FormItem label="简介:"  style="text-align:left;">
                        {{this.info.disc}}
                    </FormItem>
                </Form>
                <Button type="warning" @click="changeInfo" ghost>修改</Button>
              </div>
              
              <!-- 修改用户信息表单 -->
              <div v-if="showForm">
                <Form :model="info" label-position="left" :label-width="100">
                    <div>
                      <img @click.stop="uploadHeadImg" :src="this.info.avatarurl" width="60" height="60"/>
                      <input type="file" accept="image/*" @change="handleFile" id="hiddenInput" />
                    </div>
                    <FormItem label="昵称">
                        <Input v-model="info.username" />
                    </FormItem>
                    <FormItem label="简介">
                        <Input type="textarea" v-model="info.disc" :autosize="{minRows: 2,maxRows: 5}" />
                    </FormItem>
                </Form>
                <Button type="success" @click="sureInfo" ghost>确定</Button>
                <Button type="info" @click="cancelInfo" ghost>取消</Button>
              </div>
              {{this.info}}
              {{this.oldinfo}}

              
            </div>
            <!-- 上传图片 -->
            <div v-if="true">
              <!--图片上传-->
              <div class="weui-gallery" id="gallery">
                <span class="weui-gallery__img" id="galleryImg"></span>
                <div class="weui-gallery__opr">
                  <a href="javascript:" class="weui-gallery__del">
                    <i class="weui-icon-delete weui-icon_gallery-delete"></i>
                  </a>
                </div>
              </div>
              <div class="weui-cells weui-cells_form">
                <div class="weui-cell">
                  <div class="weui-cell__bd">
                    <textarea class="weui-textarea" v-model="content" placeholder="你想说啥" rows="3"></textarea>
                  </div>
                </div>
                <div class="weui-cell">
                  <div class="weui-cell__bd">
                    <div class="weui-uploader">
                      <div class="weui-uploader__bd">
                        <ul class="weui-uploader__files" id="uploaderFiles">
                          <li ref="files" class="weui-uploader__file" v-for="(image,index) in images" :key="index"
                              :style="'backgroundImage:url(' + image +' )'"><span @click="deleteimg(index)" class="x">&times;</span></li>
                        </ul>
                        <div v-show="images.length < maxCount" class="weui-uploader__input-box">
                          <input @change="change" id="uploaderInput" class="weui-uploader__input " type="file"
                                multiple accept="image/*">
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
              <a class="weui-btn weui-btn_primary btn-put" style="margin: 20px " @click.prevent.once="put">发送</a>
            </div>
          </div>
        </div>

    </div>
</template>

<script>
import store from '../../vuex/store'
import HeadTop from '../components/HeadTop/HeadTop'
import axios from 'axios'

export default {
    name:"Infocenter",
    data(){
        return {
            //用户框，修改框  展示与否
            showInfo:true,
            showForm:false,
            //用户信息(来接受路由传递过来的query),并且在界面上动态改变，如果用户确定则向后台提交
            info:{},
            //缓存用户信息，防止取消修改信息后原信息丢失
            oldinfo:{},
            //待上传的图片文件
            pic_file:{},
            
            //上传头像相关
            content: '',//分享动态的文字内容
            maxSize: 10240000 / 2,//图片的最大大小
            maxCount: 8,//最大数量
            filesArr: [],//保存要上传图片的数组
            images: []//转成base64后的图片的数组
        }
    },
    //引入vuex
    store,
    //引入子组件
    components: {
        HeadTop,
    },
    //方法
    methods:{
        //后退：返回上一个页面
        routerback(){
            this.$router.back(-1);
        },
        changeInfo(){
          // 用户信息框消失，修改信息框展示
          this.showInfo = false;
          this.showForm = true;
        },
        sureInfo(){//确定修改用户信息，并提交给后台
          // 用户信息框展示，修改信息框消息
          this.showInfo = true;
          this.showForm = false;
          //添加接口所需的数据file--头像,username--用户名,disc--简介,_id--唯一标识
          var formData=new FormData();// 创建form对象:接口所需的所有数据formData
          formData.append('file',this.pic_file);
          formData.append('username', this.info.username);
          formData.append('disc', this.info.disc);
          formData.append('_id', this.info._id);
          console.log('打印formData')
          console.log(formData)
          axios.post('http://localhost:4444/shangchuan', formData, {
            headers: {
              "Content-Type": "application/x-www-form-urlencoded"
            }
          }).then(function (res) {
            
            alert('修改个人信息成功！！！');
            console.log(res)
            console.log(this.oldinfo)
              console.log(this.info)
                this.info.avatarurl  = res.data.avatarurl;
                console.log(res.data);
                this.$router.push({path: '/me'});
            
          })
          .catch(err=>{
              alert('修改个人信息失败！');
              console.log(err);
          })

        },
        cancelInfo(){ //取消 修改用户信息
          // 用户信息框展示，修改信息框消息
          this.showInfo = true;
          this.showForm = false;
          //缓存用户信息，防止取消修改信息后原信息丢失
          this.info = Object.assign({}, this.oldinfo);
        },
        //头像上传
        // 打开图片上传
        uploadHeadImg: function () {
          this.$el.querySelector('#hiddenInput').click();
        },
        //点击图片触发  将头像显示(不涉及上传图片)
        handleFile: function (e) {
          let $target = e.target || e.srcElement;//找到input节点
          let file = $target.files[0];//找到上传的图片
          this.pic_file = $target.files[0];//存入data中
          
          //初始化this.formData
          this.formData = new FormData();
          

          // 单纯将头像显示
          var reader = new FileReader();//将文件内容读入内存,访问本地文件
          reader.onload = (data) => {//当读取操作成功完成时调用
            let res = data.target || data.srcElement;//捕获当前事件作用的对象
            this.info.avatarurl = res.result;//图片被转换成了二进制流(字符串类型),存储在info的avatarurl中
          };
          reader.readAsDataURL(file);//将图片内嵌在网页之中--Base64
        },
        


        // 上传头像相关的所有方法--开始
        //删除图片
        deleteimg(index) {
        this.filesArr.splice(index, 1);
        this.images.splice(index, 1);
      },
      //改变图片
      change(e) {
        let files = e.target.files;
        // 如果没有选中文件，直接返回
        if (files.length === 0) {
          return;
        }
        if (this.images.length + files.length > this.maxCount) {
          Toast('最多只能上传' + this.maxCount + '张图片！');
          return;
        }
        let reader;
        let file;
        let images = this.images;
        for (let i = 0; i < files.length; i++) {
          file = files[i];
          this.filesArr.push(file);
          reader = new FileReader();
          if (file.size > self.maxSize) {
            Toast('图片太大，不允许上传！');
            continue;
          }
          reader.onload = (e) => {
            let img = new Image();
            img.onload = function () {
              let canvas = document.createElement('canvas');
              let ctx = canvas.getContext('2d');
              let w = img.width;
              let h = img.height;
              // 设置 canvas 的宽度和高度
              canvas.width = w;
              canvas.height = h;
              ctx.drawImage(img, 0, 0, w, h);
              let base64 = canvas.toDataURL('image/png');
              images.push(base64);
            };
            img.src = e.target.result;
          };
          reader.readAsDataURL(file);
        }
      },
      //发送方法
      put() {
        let self = this;
        let content = this.content;
        let param = new FormData();
        param.append('content', content);
        param.append('username', 'wofsfsdf');
        this.filesArr.forEach((file) => {
          param.append('file2', file);
        });
        axios.post('http://localhost:4444/uploadFile', param, {
          headers: {
            "Content-Type": "application/x-www-form-urlencoded"
          }
        }).then(function (result) {
          console.log(result.data);
          this.$router.push({path: '/world'});
          Toast(result.data.msg)
        })
      },// 上传头像相关的所有方法--结束


    },//methods-end
    //beforeCreate 将路由中的 用户信息 赋值到 data(){} 中
    beforeCreate(){
        //防止token已经过期
        var localtoken = localStorage.getItem("token");
        var localusername = localStorage.getItem("user_name");
        var localparams = {
            token:localtoken,
            user_name:localusername
        };
          this.$axios({
                url:"http://localhost:4444/users/islogin",
                method:"get",
                params:localparams 
              })
              .then(res=>{
                  console.log('这里是vue初始化生命周期：');
                  if(res.data.status == 200){
                      this.info = res.data.info;
                      //对象赋值，分配一块新的内存空间
                      this.oldinfo = Object.assign({}, this.info);
                      console.log(res.data.info);
                  }
              })
              .catch(err=>{
                  console.log(err)
              })
    },//beforreCreate-end

}
</script>

<style  scoped>
#hiddenInput{
  display: none;
}

</style>

index.js 

var express = require('express');
var router = express.Router();
var path = require("path");
var User = require("../models/User");
var Info = require("../models/Info");


//图片上传模块
var multer = require('multer');

let OSS = require('ali-oss');
//阿里云oss配置自己去官网瞧
let client = new OSS({
  region: 'oss-cn-shanghai',
  accessKeyId: '****',
  accessKeySecret: '******'
});
client.useBucket('******');

/* GET home page. */
router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });
});

async function put(fileName, filePath, cb) {
  try {
    let result = await client.put(fileName, filePath);
    fs.unlinkSync("public/images/uploads/" + result.name);
    cb(result)
  } catch (err) {
    console.log(err);
  }
}

let filePath;
let fileName;

let Storage = multer.diskStorage({
  destination: function (req, file, cb) {//计算图片存放地址
    cb(null, './public/images/uploads');
  },
  filename: function (req, file, cb) {//图片文件名
    fileName = Date.now() + '_' + parseInt(Math.random() * 1000000) + '.png';
    filePath = '/public/images/uploads/' + fileName;
    cb(null, fileName)
  }
});
let upload = multer({ storage: Storage }).any();//file2表示图片上传文件的key

//自己写的用户信息接收
router.post('/shangchuan', function (req, res, next) {
  upload(req, res, function (err) {
    let content = req.body.content || "";
    let username = req.body.username;
    let imgs = []; //要保存到数据库的图片地址数组
    if (err) {
      return res.end(err);
    }
    console.log('进入图片解析--------req.body')
    console.log(req.body)
    console.log('打印 req.files------')
    console.log(req.files)
    // console.log("打印 req.files[0].path------");
    // console.log(req.files[0].path);
    // console.log(content)
    // console.log(content)
    // console.log(username)

    req.files.forEach((item, index) => {
      var filePath = `http://localhost:4444/public/images/uploads/${item.filename}`;
      console.log('数据库中的路径filePath------------')
      console.log(filePath)
    });

    res.json({
      avatarurl: filePath,
      mag: "修改个人信息成功"
    });

  });
});

//网络查的 接收用户信息
router.post('/uploadFile', function (req, res, next) {
  upload(req, res, function (err) {
    let content = req.body.content || '';
    let username = req.body.username;
    let imgs = [];//要保存到数据库的图片地址数组
    if (err) {
      return res.end(err);
    }
    if (req.files.length === 0) {
      new Pyq({
        writer: username,
        content: content
      }).save().then((result) => {
        res.json({
          result: result,
          code: '0',
          msg: '上传成功'
        });
      })
    }
    /*client.delete('public/img/1.png', function (err) {
            console.log(err)
        });*/
    let i = 0;
    req.files.forEach((item, index) => {
      let filePath = `./public/images/uploads/${item.filename}`;
      put(item.filename, filePath, (result) => {
        imgs.push(result.url);
        i++;
        if (i === req.files.length) {
          //forEach循环是同步的，但上传图片是异步的，所以用一个i去标记图片是否全部上传成功
          //这时才把数据保存到数据库
          new Pyq({
            content: content,
            writer: username,
            pimg: imgs
          }).save().then(() => {
            res.json({
              code: '0',
              msg: '发布成功'
            });
          })
        }
      })
    })
  })
});


module.exports = router;

app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
//加载数据库模块
var mongoose = require("mongoose");
// 引入jwt token工具
const JwtUtil = require('./public/utils/jwt');



var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

//解决跨域
app.all('*', function (req, res, next) {
  //将外源设为指定的域，比如：http://localhost:8080
  res.header("Access-Control-Allow-Origin", "*");
  //将Access-Control-Allow-Credentials设为true  允许携带cookie
  res.header('Access-Control-Allow-Credentials', true); 
  res.header("Access-Control-Allow-Headers", "X-Requested-With");
  res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
  res.header("X-Powered-By", ' 3.2.1');
  //配置options的请求返回,解决axios的post自定义头部字段问题
  // if (res.getMethod().equals("OPTIONS")) {
  //   HttpUtil.setResponse(response, HttpStatus.OK.value(), null);
  //   return;
  // }
  //返回数据格式为json字符串
  res.header("Content-Type", "application/json;charset=utf-8");
  next();
});

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use('/public', express.static('public'));//将文件设置成静态
// app.use(express.static(path.join(__dirname, 'public')));

/* 请求拦截器 
*/ 
// app.use(function (req, res, next) {
//   var url = req.url;
//   // 正则表达式匹配  匹配api '?' 前的路径，去除query参数
//   url = url.match(/(\S*)\?/)[1];
//   // console.log('匹配正则后');
//   // console.log(url);

//   // 把登陆和注册请求去掉了，其他的多有请求都需要进行token校验
//   if (url != "/users/login" && url != "/users/register") {
//     console.log("进入app.js拦截器,打印result");
//     /*没有弄明白怎么在headers中设置token
//     let token = req.headers.token;
//     */
//     let token = req.query.token;
//     let jwt = new JwtUtil(token);
//     let result = jwt.verifyToken();
//     // 如果考验通过就next，否则就返回登陆信息不正确（与jwt.js返回有关）
//     if (result == 'err') {
//       console.log('token已过期，被拦截器拦截');
//       console.log(result);
//       res.send({ status: 403, msg: "尚未登录(登录已过期),请重新登录!" });
//     } else {
//       console.log('token没过期，进入对应的路由')
//       next();
//     }
//   } else {
//     //放过 登录 和 注册 请求
//     next();
//   }
// });


app.use('/', indexRouter);
app.use('/users', usersRouter);





// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});


//连接数据库
mongoose.connect('mongodb://localhost:27222/blog', function (err) {
  if (err) {
    console.log(err);
    console.log('数据库连接失败！');
  } else {
    console.log("数据库连接成功！");
  }
});








module.exports = app;