TypeError: Class.function is not a function at Object.<anonymous>

Question

策略模式：interfaceBridge.js

    // START IMPORT NODE HUE API
    var hue = require("node-hue-api"),
    HueApi = hue.HueApi,
    lightState = hue.lightState;
    var displayResult = function(result) {
        console.log(result);
    };

    var displayError = function(err) {
        console.error(err);
    };


    var host = "192.168.2.129",
    username = "033a6feb77750dc770ec4a4487a9e8db",
    api = new HueApi(host, username),
    state = lightState.create();

// END IMPORT NODE HUE API

var Bridges = function() {
  this.bridge = "";
};

Bridges.prototype = {
    setBridge: function(bridge){
      this.bridge = bridge;
    },

    showAllLights: function() {
    },

    getStatusOfLamp: function(id){
    },

    setLightState: function(id, state){
    }

};

var Phue = function() {
    this.showAllLights = function() {
      api.lights(function(err, lights) {
        if (err) throw err;
        displayResult(lights);
      });
    },
    this.getStatusOfLamp = function(id){
      api.lightStatus(id, function(err, result) {
        if (err) throw err;
        displayStatus(result);
      });
    },
    this.setLightState = function(id, state){
      if(state == 'on'){
        api.setLightState(id, state.on(), function(err, result) {
             if (err) throw err;
             displayResult(result);
        });
      } else {
        api.setLightState(id, state.off(), function(err, result) {
          if (err) throw err;
          displayResult(result);
        });
      }

    }
};

var Wemo = function() {
    this.showAllLights = function() {
        //@String from Belkin WeMo API
    },
    this.getStatusOfLamp = function(id){
      //@String from Belkin WeMo API
    },
    this.setLightState = function(id, state){

    }
};

var TcpConnect = function() {
    this.showAllLights = function() {
        //@String from TCP Connect API
    },
    this.getStatusOfLamp = function(id){
      //@String from TCP Connect API
    },
    this.setLightState = function(id, state){

    }
};

module.exports = {
    Bridges: Bridges,
    Phue: Phue,
    Wemo: Wemo,
    TcpConnect: TcpConnect
};

server.js

var express = require('express');
var app = express();
var fs = require("fs");
var Bridges = require("./interfaceBridge.js").Bridges;
var Phue = require("./interfaceBridge.js").Phue;
var Wemo = require("./interfaceBridge.js").Wemo;
var Tcpconnect = require("./interfaceBridge.js").TcpConnect;

// Initialising of objects

var bridges = Bridges;
var phue = Phue;
var wemo = Wemo;
var tcpconnect = Tcpconnect;
bridges.setBridge(phue);



var PORT = 4333;
app.get('/lights/all', function (req, res) {
  bridges.showAllLights();
});

app.get('/lights/:id/state', function (req, res) {
  var id= req.params.id;

  bridges.getStatusOfLamp(id);
});

app.get('/lights/:id/state/:state', function (req, res) {
  var id = req.params.id;
  var state;

  bridges.setLightState(id, state);
});
var server = app.listen(PORT, function () {

  var host = server.address().address;
  var port = server.address().port;

  console.log("Example app listening at http://%s:%s", host, port);

});

我收到以下错误。

TypeError: bridges.setBridge is not a function
    at Object.<anonymous> (/Users/jensgryspeert/Documents/STAGE/Raspberry Rest API/server.js:12:9)
    at Module._compile (module.js:425:26)
    at Object.Module._extensions..js (module.js:432:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Function.Module.runMain (module.js:457:10)
    at startup (node.js:136:18)
    at node.js:972:3

我找不到问题所在。希望有人能帮助我。它基于策略模式，其中 Bridges 是我的接口。类使用子类的有 Phue、WeMo 和 TcpConnect。出于某种原因，他看不到我的物品。即使是 server.js.

Answer 1

您正在导出 Bridges 而不是 class 的实例。

module.exports = new Bridges(); // exporting instance of Bridges

您应该改为导出 class/function：

module.exports = Bridges;

更新：此外，您需要 export/import 正确。每个模块只能导出一个对象。在您的示例中，您可以导出一个包含所有函数的对象：

module.exports = {
    Bridges: Bridges,
    Phue: Phue,
    Wemo: Wemo,
    TcpConnect: TcpConnect
};

然后导入：

var Bridges = require("./interfaceBridge.js").Bridges;
var Phue = require("./interfaceBridge.js").Phue;
var Wemo = require("./interfaceBridge.js").Wemo;
var Tcpconnect = require("./interfaceBridge.js").TcpConnect;

Answer 2

modules.exports 的用法很奇怪。在 interfaceBridge.js 中，您可以关闭外部 ;function(){...}(); 并导出为：

modules.exports = {
    Bridges: Bridges,
    Phue: Phue,
    Wemo: Wemo,
    TcpConnect: TcpConnect
};

或

exports.Bridges = Bridges;
exports.Phue = Phue;
exports.Wemo = Wemo;
exports.TcpConnect = TcpConnect;

然后在server.js中要求：

var Bridges = require("./interfaceBridge.js").Bridges;
var Phue = require("./interfaceBridge.js").Phue;
var Wemo = require("./interfaceBridge.js").Wemo;
var TcpConnect = require("./interfaceBridge.js").TcpConnect;

TypeError: Class.function is not a function at Object.<anonymous>

TypeError: Class.function is not a function at Object.<anonymous>

node.js

runtime-error

javascript-objects

strategy-pattern