无法在Angular 2中通过npm安装依赖项

Question

我已经从主站点(快速项目)下载了Angular 2，但我在安装附加库时遇到了很多问题。例如，当我尝试安装angular2-modal模块时，我得到：

 npm install angular2-modal --save
angular-quickstart@1.0.0 C:\WebServ\httpd\quickstart
`-- angular2-modal@2.0.2

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.0.17: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN @angular/upgrade@2.2.4 requires a peer of @angular/core@2.2.4 but none was installed.
npm WARN @angular/upgrade@2.2.4 requires a peer of @angular/compiler@2.2.4 but none was installed.
npm WARN @angular/upgrade@2.2.4 requires a peer of @angular/platform-browser@2.2.4 but none was installed.
npm WARN @angular/upgrade@2.2.4 requires a peer of @angular/platform-browser-dynamic@2.2.4 but none was installed.

我不能安装任何东西，因为这个fsevents我想。当我试着去做

npm update 

我收到了

npm update --save
npm ERR! Windows_NT 6.1.7601
npm ERR! argv "D:\\Program Files\\nodejs\\node.exe" "D:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "update" "--save"
npm ERR! node v6.9.2
npm ERR! npm  v3.10.9
npm ERR! code EBADPLATFORM

npm ERR! notsup Unsupported platform for fsevents@1.0.17: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm ERR! notsup Valid OS:    darwin
npm ERR! notsup Valid Arch:  any
npm ERR! notsup Actual OS:   win32
npm ERR! notsup Actual Arch: x64

npm ERR! Please include the following file with any support request:
npm ERR!     C:\WebServ\httpd\quickstart\npm-debug.log

如何修复它？

{


"name": "angular-quickstart",
  "version": "1.0.0",
  "description": "QuickStart package.json from the documentation, supplemented with testing support",
  "scripts": {
    "start": "tsc && concurrently \"tsc -w\" \"lite-server\" ",
    "e2e": "tsc && concurrently \"http-server -s\" \"protractor protractor.config.js\" --kill-others --success first",
    "lint": "tslint ./app/**/*.ts -t verbose",
    "lite": "lite-server",
    "pree2e": "webdriver-manager update",
    "test": "tsc && concurrently \"tsc -w\" \"karma start karma.conf.js\"",
    "test-once": "tsc && karma start karma.conf.js --single-run",
    "tsc": "tsc",
    "tsc:w": "tsc -w"
  },
  "keywords": [],
  "author": "",
  "license": "MIT",
  "dependencies": {
    "@angular/common": "^2.4.3",
    "@angular/compiler": "^2.4.3",
    "@angular/core": "^2.4.3",
    "@angular/forms": "^2.4.3",
    "@angular/http": "^2.4.3",
    "@angular/platform-browser": "^2.4.3",
    "@angular/platform-browser-dynamic": "^2.4.3",
    "@angular/router": "^3.4.3",
    "@angular/upgrade": "^2.2.4",
    "@swimlane/ngx-datatable": "^5.0.0",
    "@types/jasmine": "^2.5.41",
    "@types/node": "^6.0.60",
    "angular-datatables": "^2.0.1",
    "angular-in-memory-web-api": "~0.2.4",
    "angular2-datatable": "^0.5.2",
    "fsevents": "^1.0.0",
    "angular2-modal": "^2.0.2",
    "core-js": "^2.4.1",
    "datatables.net": "^2.1.1",
    "datatables.net-dt": "^2.1.1",
    "jquery": "^3.1.1",
    "karma": "^1.4.0",
    "rxjs": "^5.0.3",
    "systemjs": "0.19.40",
    "zone.js": "^0.7.6"
  },
  "devDependencies": {
    "concurrently": "^3.1.0",
    "lite-server": "^2.2.2",
    "typescript": "~2.0.10",
    "canonical-path": "0.0.2",
    "http-server": "^0.9.0",
    "tslint": "^3.15.1",
    "lodash": "^4.16.4",
    "jasmine-core": "~2.4.1",
    "karma": "^1.3.0",
    "karma-chrome-launcher": "^2.0.0",
    "karma-cli": "^1.0.1",
    "karma-jasmine": "^1.0.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~4.0.14",
    "rimraf": "^2.5.4",
    "@types/node": "^6.0.46",
    "@types/jasmine": "^2.5.36"
  },
  "repository": {}
}

Answer 1

fsevents是特定于OS X的应用程序接口，可以在该操作系统上更好地处理文件通知事件。由于您使用的是Windows，因此不能运行fsevents。它只适用于OS。

您收到的npm WARN消息只是警告。它跳过了你不能安装在你的操作系统上的可选的fsevents依赖。你得到的其他一些警告是你想要安装的Angular2 (2.4.3)和angular2- Some想要的版本不匹配(2.2.4)，但是这应该可以正常工作。

从package.json中删除fsevents。一些其他依赖项可能会尝试在OS上安装它，但您不需要将其作为项目的核心依赖项。

Answer 2

从node_modules中删除所有内容。从终端运行"npm install“。然后尝试运行"npm start“。确保您安装了最新版本的node & npm

Answer 3

通过NPM下载工作Angular2的简单步骤

1. Install NPM into your system
2. Install node.js into your system
3. Now遵循以下步骤:-

注意:-用于全局安装Angular2命令行界面命令：npm install -g @angular/cli

Step.1 npm install --save-dev @angular/cli@latest (安装角度依赖项)

第2步ng new my-app (创建新的Angular2项目)

Step.3 cd my-app (转到您的项目路径)

Step.4 ng serve --open (此命令用于启动服务器)

打开您的Angular2项目:- http://localhost:4200/