NodeJS+axios上传图片

changeEvent (e) {   ------  //change事件方法
   let oFile = e.target.files[0]  ------  //获取文件对象
   let param = new FormData()  ------  //new一个formData
   param.append(‘file‘, oFile, oFile.name)   ------  //将文件添加到formdata中
   param.append(‘chunk‘, ‘0‘) 
   let config = {
          headers: {‘Content-Type‘: ‘multipart/form-data‘}
    }
   this.axios.post(‘/api/upload/upavatar?username=‘ + username, param, config) ------//传输数据
          .then(response => {
            if (response.data.data === 1) {  ------ //成功后的回掉
              let instance = Toast({
                message: ‘头像更改成功‘
              })
              setTimeout(() => {
                instance.close()
              }, 1000)
            }
          })

}

router.post(‘/upavatar‘, function (req, res, next) {
  var form = new formidable.IncomingForm()
  form.uploadDir = path.normalize(__dirname + ‘/../public/images/avatar‘) ------图片上传目录
  form.parse(req, function (err, fields, files) {
    var oldpath = files.file.path
    var newpath = path.normalize(__dirname + ‘/../public/images/avatar‘) + ‘\\‘ + req.query.username + ‘.png‘    -------//给上传的图片重命名
    fs.rename(oldpath, newpath, function (err) {
      if (err) {
        res.send(‘-1‘)
        return
      }
      if (newpath) {
        let avatarPath = ‘server/public/images/avatar/‘ + req.query.username + ‘.png‘  ------//存入数据库的图片地址(相对于页面)
        db.updateMany(‘users‘, {‘username‘: req.query.username}, {$set: {avatar: avatarPath}}, function (err, result) {  ------//更新数据库的头像地址
          if (err) {
            res.send(‘-2‘)
            return
          }
          res.json({data: 1})
        })
      }
    })
  })
})