我已经在 heroku 上部署了django app，一切都很好，没有错误等。我在前端使用react，我想做npm install，gulp build这样我就可以正确配置我的应用程序。
我不能运行heroku run npm install，我所拥有的只是bash: npm: command not found，我想这没关系，因为当他在服务器上构建应用程序时，我需要以某种方式触发它，所以我修改了我的package.json如下：
{
"name": "Test app",
"version": "1.0.0",
"description": "Testing",
"main": "bundle.js",
"scripts": {
"postinstall": "npm install"
},
"dependencies": {
"bootstrap": "^3.3.7",
"babel-preset-es2015": "^6.1.2",
"babel-preset-react": "^6.1.2",
"babelify": "^7.2.0",
"browser-sync": "^2.10.0",
"browserify": "^12.0.1",
"browserify-shim": "^3.8.11",
"classnames": "^2.2.0",
"core-util-is": "^1.0.1",
"del": "^2.1.0",
"flux": "^2.1.1",
"gulp-autoprefixer": "^3.1.0",
"gulp-bless": "^3.0.1",
"gulp-connect": "^2.2.0",
"gulp-html-replace": "^1.5.4",
"gulp-if": "^2.0.0",
"gulp-insert": "^0.5.0",
"gulp-livereload": "^3.8.1",
"gulp-load-plugins": "^1.1.0",
"gulp-minify-css": "^1.2.1",
"gulp-rename": "^1.2.2",
"gulp-sass": "^2.1.0",
"gulp-sourcemaps": "^1.6.0",
"gulp-sync": "^0.1.4",
"gulp-uglify": "^1.4.2",
"history": "^1.13.0",
"keymirror": "^0.1.1",
"lodash": "^3.10.1",
"react": "^0.14.2",
"react-addons": "^0.9.0",
"react-bootstrap": "^0.27.3",
"react-dom": "^0.14.2",
"react-mixin": "^3.0.3",
"react-router": "^1.0.0",
"react-style": "^0.5.5",
"reqwest": "^2.0.5",
"rimraf": "^2.4.3",
"run-sequence": "^1.1.4",
"vinyl-buffer": "^1.0.0",
"vinyl-source-stream": "^1.1.0",
"watchify": "^3.6.0",
"when": "^3.7.4"
},
"devDependencies": {
"babel-preset-es2015": "^6.1.2",
"babel-preset-react": "^6.1.2",
"babelify": "^7.2.0",
"browser-sync": "^2.10.0",
"browserify": "^12.0.1",
"browserify-shim": "^3.8.11",
"classnames": "^2.2.0",
"core-util-is": "^1.0.1",
"del": "^2.1.0",
"flux": "^2.1.1",
"gulp-autoprefixer": "^3.1.0",
"gulp-bless": "^3.0.1",
"gulp-connect": "^2.2.0",
"gulp-html-replace": "^1.5.4",
"gulp-if": "^2.0.0",
"gulp-insert": "^0.5.0",
"gulp-livereload": "^3.8.1",
"gulp-load-plugins": "^1.1.0",
"gulp-minify-css": "^1.2.1",
"gulp-rename": "^1.2.2",
"gulp-sass": "^2.1.0",
"gulp-sourcemaps": "^1.6.0",
"gulp-sync": "^0.1.4",
"gulp-uglify": "^1.4.2",
"history": "^1.13.0",
"keymirror": "^0.1.1",
"lodash": "^3.10.1",
"react": "^0.14.2",
"react-addons": "^0.9.0",
"react-bootstrap": "^0.27.3",
"react-dom": "^0.14.2",
"react-mixin": "^3.0.3",
"react-router": "^1.0.0",
"react-style": "^0.5.5",
"reqwest": "^2.0.5",
"rimraf": "^2.4.3",
"run-sequence": "^1.1.4",
"vinyl-buffer": "^1.0.0",
"vinyl-source-stream": "^1.1.0",
"watchify": "^3.6.0",
"when": "^3.7.4"
},
"engines": {
"node": "8.0.0",
"npm": "5.0.4"
},
"author": "",
"license": ""
}
但这仍然不会触发部署npm install过程，所以任何人都可以帮助我了解如何正确配置它吗？
这是我的Procfile：
web: python manage.py runserver 0.0.0.0:$PORT --noreload
worker: python worker.py
Heroku 通过构建包支持不同的服务器端语言：
构建包负责将部署的代码转换为 slug，然后可以在测功机上执行。构建包由一组脚本组成，根据编程语言，脚本将检索依赖项、输出生成的资产或编译的代码等。
由于应用程序的 Python 部分似乎安装正确，因此 Heroku 必须将其检测为 Python 应用程序(因为它包含一个requirements.txt文件)，或者您已手动将其配置为一个应用程序。在许多情况下，单个构建包就足够了。
但是，由于您也使用 Node.js因此您应该启用第二个构建包：
在许多情况下，在构建应用程序时，单个构建包是不够的。这包括您需要执行以下操作的情况：
- 为应用使用的每种语言运行构建包。例如，为资产运行 JavaScript 构建包，为应用程序运行 Ruby 构建包。
基本流程如下所示(使用开发计算机上的 Heroku CLI)：
heroku buildpacks:set heroku/python
heroku buildpacks:add --index 2 heroku/nodejs
我上面提供的链接包含更多详细信息。我建议完整阅读它们。