在heroku上运行角度应用程序时出现应用程序错误

Question

我已成功将我的 angular2 应用程序部署到 heroku，但不幸的是，我收到 “应用程序发生错误，无法提供您的页面”页面显示。

当我使用 npm start 在本地运行应用程序时，它运行良好。

我认为这可能与依赖项或具有不同配置的 heroku 实例有关。我尝试修改启动命令，但无济于事。

该项目基于 here 找到的 Angular 快速入门指南

我的 package.json 文件

{
  "name": "danoram-angular-quickstart",
  "version": "1.0.0",
  "scripts": {
    "start": "npm run lite",
    "lite": "lite-server"
  },
  "license": "MIT",
  "dependencies": {
    "@angular/common": "~2.3.0",
    "@angular/compiler": "~2.3.0",
    "@angular/core": "~2.3.0",
    "@angular/forms": "~2.3.0",
    "@angular/http": "~2.3.0",
    "@angular/platform-browser": "~2.3.0",
    "@angular/platform-browser-dynamic": "~2.3.0",
    "@angular/router": "~3.3.0",
    "@angular/upgrade": "~2.3.0",
    "angular-in-memory-web-api": "~0.1.16",
    "core-js": "^2.4.1",
    "reflect-metadata": "^0.1.8",
    "rxjs": "5.0.0-rc.4",
    "zone.js": "^0.7.2"
  },
  "devDependencies": {
    "concurrently": "^3.0.0",
    "lite-server": "^2.2.2",
    "webpack": "^1.14.0"
  }
}

heroku 日志

2016-12-20T05:55:10.169815+00:00 app[web.1]: npm ERR! Failed at the danoram-angular-quickstart@1.0.0 lite script 'lite-server'.
2016-12-20T05:55:10.170077+00:00 app[web.1]: npm ERR! Make sure you have the latest version of node.js and npm installed.
2016-12-20T05:55:10.170162+00:00 app[web.1]: npm ERR! If you do, this is most likely a problem with the danoram-angular-quickstart package,
2016-12-20T05:55:10.170243+00:00 app[web.1]: npm ERR! not with npm itself.
2016-12-20T05:55:10.170321+00:00 app[web.1]: npm ERR! Tell the author that this fails on your system:
2016-12-20T05:55:10.170401+00:00 app[web.1]: npm ERR!     lite-server
2016-12-20T05:55:10.170464+00:00 app[web.1]: npm ERR! You can get information on how to open an issue for this project with:
2016-12-20T05:55:10.170538+00:00 app[web.1]: npm ERR!     npm bugs danoram-angular-quickstart
2016-12-20T05:55:10.170618+00:00 app[web.1]: npm ERR! Or if that isn't available, you can get their info via:
2016-12-20T05:55:10.170696+00:00 app[web.1]: npm ERR!     npm owner ls danoram-angular-quickstart
2016-12-20T05:55:10.170790+00:00 app[web.1]: npm ERR! There is likely additional logging output above.
2016-12-20T05:55:10.173933+00:00 app[web.1]: 
2016-12-20T05:55:10.174095+00:00 app[web.1]: npm ERR! Please include the following file with any support request:
2016-12-20T05:55:10.174171+00:00 app[web.1]: npm ERR!     /app/npm-debug.log
2016-12-20T05:55:10.183775+00:00 app[web.1]: 
2016-12-20T05:55:10.191217+00:00 app[web.1]: npm ERR! Linux 3.13.0-105-generic
2016-12-20T05:55:10.191388+00:00 app[web.1]: npm ERR! argv "/app/.heroku/node/bin/node" "/app/.heroku/node/bin/npm" "start"
2016-12-20T05:55:10.191531+00:00 app[web.1]: npm ERR! node v6.9.1
2016-12-20T05:55:10.191647+00:00 app[web.1]: npm ERR! npm  v3.10.8
2016-12-20T05:55:10.191761+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2016-12-20T05:55:10.191855+00:00 app[web.1]: npm ERR! danoram-angular-quickstart@1.0.0 start: `npm run lite`
2016-12-20T05:55:10.191943+00:00 app[web.1]: npm ERR! Exit status 1

我也把项目代码放到了github上供参考here

感谢所有帮助！

Answer 1

如果没有后端，您无法将应用部署到 heroku。在我看来，使用angular2 应用程序的最佳后端选择是nodejs/express 框架。

Heroku 会查看你的 package.json 的启动脚本，它应该是这样的：

"scripts": {
    "start": "node app.js"
  }

我的建议是将您的项目包装在一个文件夹中（比如说 client 文件夹），然后在新的根目录中，创建另一个 package.json 和一个 app.js 文件

package.json：

{
  "name": "basictemplate",
  "version": "1.0.0",
  "description": "",
  "main": "web.js",
  "scripts": {
    "start": "node app.js",
    "test": "echo \"Error: no test specified\" && exit 1",
    "heroku-prebuild": "echo This runs before Heroku installs your dependencies.",
    "heroku-postbuild": "npm install --prefix ./client"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.13.3",
    "express": "^4.13.3"
  },
  "engines": {
    "node": "4.1.1"
  }
}

app.js：

var express = require('express');
var app = express();
var server = require('http').Server(app);
var bodyParser = require('body-parser');

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}) );

app.use( express.static(__dirname + '/client' ) );

var listener = server.listen(process.env.PORT || 5000, function(){
    console.log('Listening on port ' + listener.address().port); //Listening on port 5000
});

更多信息：https://devcenter.heroku.com/articles/deploying-nodejs