在vue中使用回调函数,this调用无效的解决

updateStudentInfoToServer:function(data, networkOk, networkError){
 let postData = this.$qs.stringify({
  data:data
 })
 
 this.axios.post('/api/update/updateStudentInfo',
  postData
 ).then(res=>{
  console.log(' return : ')
  console.log(res)
  networkOk(res) //网络成功的回调
 
 }).catch(error=>{
  console.log(error)
  networkError(error) //网络失败的回调
 }) 
 
 console.log('axios done')
}, 
 
this.updateStudentInfoToServer(data, function(res){
  console.log('return ok')
  console.log(res)
  // console.log('self')
  // console.log(self) //就是this
  // console.log('this')
  // console.log(this) //undefined
 
  self.handleCancelEdit()
 },function(error){
  console.log(error)
 }
 
)

this.updateStudentInfoToServer(this, res=>{
  console.log('return ok')
  console.log(res)
  console.log('self')
  console.log(self)
  console.log('this')
 
  console.log(this)//this和self一样
 
 }, error=>{
  console.log(error)
 }
)

exports.install = function(Vue, option){
 Vue.prototype.setData = function(that, key){
 that[key] = '222'
 }
 
 Vue.prototype.testCallMe = function(str){
 console.log('test call me' + str)
 }
 
 Vue.prototype.testCallBack = function(func, param){
 func(param)
 this.testCallMe('tetetet')
 }
}

test:function(str){
 this.msg = '233' + str
},