syntax = "proto2";//protobuf版本
option java_package = "com.test.protobuf";
option java_outer_classname = "PersonMessage";
message Person {
 required int32 id = 1;
 optional string name = 2;
 optional string email = 3;
 repeated string list = 4;
 extensions 100 to 1000;//允许扩展的ID
}

message PersonTree {
 optional string id = 1;
 optional string title = 2;
 repeated PersonTree childs = 3;
}

extend Person {
 optional int32 count = 101;
 optional int32 likes_cnt= 102;
}

message PersonEx {
 optional int32 id = 1;
 extend Person {
  optional int32 px = 103;
  optional int32 py= 104;
 }
 optional Person p = 2;
}

npm install -g vue-cli
vue init webpack my-project
cd my-project
npm install
npm run dev

methods: {
  protobufferTest () {
   var message = new messages.Person() // 调用Person对象 实例化
   // 赋值
   message.setId(23)
   message.setName('asd')
   // 序列化
   var bytes = message.serializeBinary()

   console.log(bytes) // Uint8Array(7) [8, 23, 18, 3, 97, 115, 100]

   // 反序列化
   var message2 = messages.Person.deserializeBinary(bytes)

   console.log(message2) // proto.PersonTree {wrappers_: null, messageId_: undefined, arrayIndexOffset_: -1, array: Array(3), pivot_: 1.7976931348623157e+308, …}

  }
 }

此方法已弃用
protobufferTest () {
   var message = new messages.Person() // 调用Person对象 实例化
   // 赋值
   message.setId(23)
   message.setName('asd')
   // 序列化
   var bytes = message.serializeBinary()

   console.log(bytes) // Uint8Array(7) [8, 23, 18, 3, 97, 115, 100]

   var tests = ''
   for (let index = 0; index < bytes.length; index++) {
    tests += String.fromCharCode(bytes[index])
   }
   console.log(tests) // asd

   // 存入FormData
   let uploadDatas = new FormData()
   uploadDatas.append('protobuf', tests)

   // 使用axios传输给后台
   this.axios.post('/test', uploadDatas)
    .then(function (response) {
     // 将传回的字符串转为数组
     console.log(response.data.split('')) // ["", "", "3", "2", "", "", "a", "s", "d", "f"]
     let str = response.data.split('')
     let toChar = []
     for (let index = 0; index < str.length; index++) {
      toChar.push(str[index].charCodeAt())
     }
     console.log(toChar) // [10, 2, 51, 50, 18, 4, 97, 115, 100, 102]

     // 后台传回来的是PersonTree里面的值所以调用PersonTree来反序列化
     var message2 = messages.PersonTree.deserializeBinary(toChar)

     console.log(message2) // proto.PersonTree {wrappers_: null, messageId_: undefined, arrayIndexOffset_: -1, array: Array(3), pivot_: 1.7976931348623157e+308, …}

     // 获取PersonTree的id值
     console.log(message2.getId()) // 32
    })
    .catch(function (error) {
     console.log(error)
    })

  }

protobufferTest () {
   var message = new messages.Person()
   message.setId(23)
   message.setName('asd')
   var bytes = message.serializeBinary()
   
   console.log(bytes)
   let uploadDatas = new FormData()
   var blob = new Blob([bytes], {type: 'application/octet-stream'})

   uploadDatas.append('protobuf', blob)
   
   this.axios.post('/test', uploadDatas)
    .then(function (response) {
     console.log(response)

     var message2 = messages.PersonTree.deserializeBinary(response.data)
     console.log(message2.getId())
    })
    .catch(function (error) {
     console.log(error)
    })
   // console.log(bytes)
  }