找不到karma插件依赖项

Question

C:\devl\JS\myProject>karma start
06 09 2015 11:30:19.133:WARN [plugin]: Cannot find plugin "karma-chrome-launcher
".
  Did you forget to install it ?
  npm install karma-chrome-launcher --save-dev
06 09 2015 11:30:19.149:WARN [plugin]: Cannot find plugin "karma-firefox-launche
r".
  Did you forget to install it ?
  npm install karma-firefox-launcher --save-dev
06 09 2015 11:30:19.159:WARN [plugin]: Cannot find plugin "karma-ie-launcher".
  Did you forget to install it ?
  npm install karma-ie-launcher --save-dev

├─┬ karma-chrome-launcher@0.2.0
│ ├─┬ fs-access@1.0.0
│ │ └── null-check@1.0.0
│ └─┬ which@1.1.1
│   └─┬ is-absolute@0.1.7
│     └── is-relative@0.1.3
├── karma-firefox-launcher@0.1.6
├─┬ karma-ie-launcher@0.2.0
│ └── lodash@3.10.1
└── karma-jasmine@0.3.6

我已经尝试重新启动我的node_dependencies并再次运行npm install，但我不确定还可以尝试什么

编辑：我已经验证了我的node_dependencies目录和插件目录在那里。

Answer 1

当第一次开始因果报应时，有两个看似相似的抱怨：

[preprocess]: Can not load "webpack", it is not registered!
  Perhaps you are missing some plugin?

和

[plugin]: Cannot find plugin "karma-webpack".
  Did you forget to install it ?
  npm install karma-webpack --save-dev

以下是我最好的建议，以修复这两个问题与您的配置…

plugins: [
  'karma-chrome-launcher',
  'karma-tap',
  'karma-sourcemap-loader',
  'karma-webpack' // *** This 'registers' the Karma webpack plugin.
],

$ npm uninstall -g karma
$ npm install karma --save-dev