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错误：未指定默认引擎且未提供扩展名（将应用程序部署到Heroku）

• 问答

我正在尝试将一个简单的html / css / js应用程序部署到Heroku，并且已经使用Node.js设置了我的后端，如下所示：

（server.js） 

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.render("index");
})

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

（Procfile） 

web: npm server.js

（package.json） 

{
  "name": "dice-game","version": "1.0.0","description": "js application","scripts": {
    "start": "node server.js","test": "echo \"Error: no test specified\" && exit 1"
  },"engines": {
    "node": "9.8.0"
  },"repository": {
    "type": "git","url": "git+https://github.com/zay-asad/dice-game.git"
  },"author": "zayan asad","license": "ISC","bugs": {
    "url": "https://github.com/zay-asad/dice-game/issues"
  },"homepage": "https://github.com/zay-asad/dice-game#readme","dependencies": {
    "express": "^4.17.1"
  }
}

每当我尝试使用“ node server.js” 在本地运行节点时，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说我的应用程序已成功部署，但是每当我从UI中单击“打开应用程序”时，我都会得到这个

application_error_heroku_ui

有人以前有这个问题吗？任何帮助将不胜感激

更新

所以我现在这样设置

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

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

但是我得到错误：ENOENT：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？ @Mark

zqf1235678910 回答：错误：未指定默认引擎且未提供扩展名（将应用程序部署到Heroku）

res.render("index");与模板引擎（如车把或胡须）一起使用。我假设您只想发送/提供index.html文件。请改用res.sendFile 

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(__dirname,"dice-game") 
    });
})

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

,

解决了。解决方案是分别导入每个png图像。有用！ 

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("/",{ 
      root: __dirname
    });
})

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

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

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

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

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

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

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

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

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