npm不会安装Firebase

Question

我正在开发Ionic应用程序并希望包含Firebase。显然，这不像网页那么容易。所以，我遵循this教程。在 “安装的应用程序”，它说，

npm install angularfire2@4.0.0-rc0 firebase --save

这给了我输出

hacker_news_app_v2@0.0.1 
/home/sean/Dropbox/Programming/Ionic/hacker_news_app_v2 
├── angularfire2@4.0.0-rc0 
└─┬ UNMET PEER DEPENDENCY firebase@4.1.2 
    ├── jsonwebtoken@7.4.1 
    ├── ms@2.0.0 
    └── safe-buffer@5.1.0 

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@1.1.2: wanted {"os":"darwin","arch":"any"} (current: 
{"os":"linux","arch":"x64"}) 
npm WARN angularfire2@4.0.0-rc0 requires a peer of firebase@^3.6.6 but 
none was installed. 

于是我试着

sudo npm install firebase@4.1.2

这给了我

hacker_news_app_v2@0.0.1 
/home/sean/Dropbox/Programming/Ionic/hacker_news_app_v2 
└── UNMET PEER DEPENDENCY firebase@4.1.2 

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@1.1.2: wanted {"os":"darwin","arch":"any"} (current: 
{"os":"linux","arch":"x64"}) 
npm WARN angularfire2@4.0.0-rc0 requires a peer of firebase@^3.6.6 but 
none was installed. 
npm ERR! code 1 

（为什么会出现在firebase@^3.6.6插入符号？）

所以，最后，我想

sudo npm install firebase@^3.6.6

这给

- base64-url@1.3.3 node_modules/firebase/node_modules/base64-url 
- rsvp@3.2.1 node_modules/firebase/node_modules/rsvp 
hacker_news_app_v2@0.0.1 
/home/sean/Dropbox/Programming/Ionic/hacker_news_app_v2 
└─┬ firebase@3.9.0 invalid 
    ├── ecdsa-sig-formatter@1.0.9 
    ├── jsonwebtoken@7.4.0 
    ├── jwa@1.1.5 
    ├── moment@2.18.1 
    ├── ms@0.7.3 
    └── promise-polyfill@6.0.2 

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@1.1.2: wanted {"os":"darwin","arch":"any"} (current: 
{"os":"linux","arch":"x64"}) 

好了，怎么样我解释最后一个吗？我怎样才能安装angularfire？

Answer 1

我跑sudo npm install firebase@latest它工作。