javascript - Node.js:找不到模块 'chai'

Question

我正在尝试遵循 https://mochajs.org/ 中的第一个示例

完成了

$ npm install -g mocha

得到

C:\Windows\system32>npm install -g mocha
npm WARN deprecated jade@0.26.3: Jade has been renamed to pug, please install th
e latest version of pug instead of jade
npm WARN deprecated graceful-fs@2.0.3: graceful-fs version 3 and before will fai
l on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possibl
e.
C:\Users\TestUser\AppData\Roaming\npm\_mocha -> C:\Users\TestUser\AppData\Roamin
g\npm\node_modules\mocha\bin\_mocha
C:\Users\TestUser\AppData\Roaming\npm\mocha -> C:\Users\TestUser\AppData\Roaming
\npm\node_modules\mocha\bin\mocha
mocha@2.4.5 C:\Users\TestUser\AppData\Roaming\npm\node_modules\mocha
├── escape-string-regexp@1.0.2
├── growl@1.8.1
├── commander@2.3.0
├── diff@1.4.0
├── supports-color@1.2.0
├── debug@2.2.0 (ms@0.7.1)
├── mkdirp@0.5.1 (minimist@0.0.8)
├── jade@0.26.3 (commander@0.6.1, mkdirp@0.3.0)
└── glob@3.2.3 (inherits@2.0.1, graceful-fs@2.0.3, minimatch@0.2.14)

还安装了 chai(对不起，我原来忘了提)

C:\Windows\system32>npm install -g chai
chai@3.5.0 C:\Users\TestUser\AppData\Roaming\npm\node_modules\chai
├── assertion-error@1.0.1
├── type-detect@1.0.0
└── deep-eql@0.1.3 (type-detect@0.1.1)

这是代码

var assert = require('chai').assert;
describe('Array', function() {
  describe('#indexOf()', function () {
    it('should return -1 when the value is not present', function () {
      assert.equal(-1, [1,2,3].indexOf(5));
      assert.equal(-1, [1,2,3].indexOf(0));
    });
  });
});

继续努力

Error: Cannot find module 'chai'
at Function.Module._resolveFilename (module.js:325:15)
at Function.Module._load (module.js:276:25)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object.<anonymous> (c:\git\develop\SendText\test\test2.js:1:76)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Function.Module.runMain (module.js:441:10)

我做错了什么？

Answer 1

你已经安装了 chai globally(带有 -g 选项)，这就是为什么 require 找不到它。

您需要将它安装在本地(在您的node_modules 目录上)，以便require 可以找到它。

为此，请输入:

npm install --save-dev chai