Javascript 错误：未指定默认引擎，也未提供扩展（将应用程序部署到Heroku）

我正在尝试将一个简单的html/css/js应用程序部署到Heroku，我已经用Node.js设置了后端，如下所示：

（server.js）

（程序文件）

（package.json）

每当我尝试使用“node server.js”在本地运行node时，都会收到以下错误消息：

错误：

No default engine was specified and no extension was provided.
    at new View (/Users/oas03/dice-game/node_modules/express/lib/view.js:61:11)
    at Function.render (/Users/oas03/dice-game/node_modules/express/lib/application.js:570:12)
    at ServerResponse.render (/Users/oas03/dice-game/node_modules/express/lib/response.js:1012:7)
    at /Users/oas03/dice-game/server.js:10:9
    at Layer.handle [as handle_request] (/Users/oas03/dice-game/node_modules/express/lib/router/layer.js:95:5)
    at next (/Users/oas03/dice-game/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/Users/oas03/dice-game/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/Users/oas03/dice-game/node_modules/express/lib/router/layer.js:95:5)
    at /Users/oas03/dice-game/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/Users/oas03/dice-game/node_modules/express/lib/router/index.js:335:12)

此外，Heroku说我的应用程序已经成功部署，但每当我从UI中单击“打开应用程序”时，我都会收到这个消息

以前有人有过这个问题吗？任何帮助都将不胜感激

更新

所以我现在把它设置成这样

var path = require("path");
var express = require('express');
var app = express();

var port = process.env.PORT || 8080;

app.use(express.static('dice-game'));

//routes
app.get("/", function(req, res) {
    res.sendFile('index.html', { 
      root: path.join('dice-game', "dice-game") 
    });
})

app.listen(port, function() {
    console.log("app running");
})

但是我得到了错误：enoint:没有这样的文件或目录，stat'/Users/oas03/dice game/dice game/dice game/index.html'

有什么想法吗@标记

res.render（“索引”）

与模板引擎一起使用，如把手或胡须。我假设您只想发送/提供index.html文件。改用

res.sendFile

var path=require（“路径”）；
var express=需要（“express”）；
var-app=express（）；
var port=process.env.port | | 8080；
应用程序使用（express.static（'dice-game'））；
//路线
应用程序获取（“/”，函数（请求，恢复）{
res.sendFile（'index.html'，{
root:path.join（uu dirname，“骰子游戏”）
});
})
app.listen（端口，函数（）{
console.log（“应用程序运行”）；
})

解决了这个问题。解决方案是分别导入每个png图像。它起作用了

var path = require("path");
var express = require('express');
var app = express();

var port = process.env.PORT || 8080;

app.use(express.static('dice-game'));

//routes
app.get("/", function(req, res) {
    res.sendFile('index.html', { 
      root: __dirname
    });
})

//route
app.get("/style.css", function(req, res) {
  res.sendFile('style.css', { 
    root: __dirname
  });
})

//route
app.get("/dice-1.png", function(req, res) {
  res.sendFile('dice-1.png', { 
    root: __dirname
  });
})

//route
app.get("/app.js", function(req, res) {
  res.sendFile('app.js', { 
    root: __dirname
  });
})

//route
app.get("/dice-2.png", function(req, res) {
  res.sendFile('dice-2.png', { 
    root: __dirname
  });
})

//route
app.get("/dice-3.png", function(req, res) {
  res.sendFile('dice-3.png', { 
    root: __dirname
  });
})

//route
app.get("/dice-4.png", function(req, res) {
  res.sendFile('dice-4.png', { 
    root: __dirname
  });
})

//rout
app.get("/dice-5.png", function(req, res) {
  res.sendFile('dice-5.png', { 
    root: __dirname
  });
})

//route
app.get("/dice-6.png", function(req, res) {
  res.sendFile('dice-6.png', { 
    root: __dirname
  });
})

app.listen(port, function() {
    console.log("app running");
})

---

您好，我已经应用了建议的更改，但这次出现了不同的错误，您能再次查看我的问题吗？我已经在上面发布了新错误调整/更改

index.html

文件的根路径，我不知道你的文件结构，我认为你的

index.html

在你的

express.static（…）

服务静态目录中

No default engine was specified and no extension was provided.
    at new View (/Users/oas03/dice-game/node_modules/express/lib/view.js:61:11)
    at Function.render (/Users/oas03/dice-game/node_modules/express/lib/application.js:570:12)
    at ServerResponse.render (/Users/oas03/dice-game/node_modules/express/lib/response.js:1012:7)
    at /Users/oas03/dice-game/server.js:10:9
    at Layer.handle [as handle_request] (/Users/oas03/dice-game/node_modules/express/lib/router/layer.js:95:5)
    at next (/Users/oas03/dice-game/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/Users/oas03/dice-game/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/Users/oas03/dice-game/node_modules/express/lib/router/layer.js:95:5)
    at /Users/oas03/dice-game/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/Users/oas03/dice-game/node_modules/express/lib/router/index.js:335:12)

var path = require("path");
var express = require('express');
var app = express();

var port = process.env.PORT || 8080;

app.use(express.static('dice-game'));

//routes
app.get("/", function(req, res) {
    res.sendFile('index.html', { 
      root: path.join('dice-game', "dice-game") 
    });
})

app.listen(port, function() {
    console.log("app running");
})

var path = require("path");
var express = require('express');
var app = express();

var port = process.env.PORT || 8080;

app.use(express.static('dice-game'));

//routes
app.get("/", function(req, res) {
    res.sendFile('index.html', { 
      root: __dirname
    });
})

//route
app.get("/style.css", function(req, res) {
  res.sendFile('style.css', { 
    root: __dirname
  });
})

//route
app.get("/dice-1.png", function(req, res) {
  res.sendFile('dice-1.png', { 
    root: __dirname
  });
})

//route
app.get("/app.js", function(req, res) {
  res.sendFile('app.js', { 
    root: __dirname
  });
})

//route
app.get("/dice-2.png", function(req, res) {
  res.sendFile('dice-2.png', { 
    root: __dirname
  });
})

//route
app.get("/dice-3.png", function(req, res) {
  res.sendFile('dice-3.png', { 
    root: __dirname
  });
})

//route
app.get("/dice-4.png", function(req, res) {
  res.sendFile('dice-4.png', { 
    root: __dirname
  });
})

//rout
app.get("/dice-5.png", function(req, res) {
  res.sendFile('dice-5.png', { 
    root: __dirname
  });
})

//route
app.get("/dice-6.png", function(req, res) {
  res.sendFile('dice-6.png', { 
    root: __dirname
  });
})

app.listen(port, function() {
    console.log("app running");
})