我有一个CI版本，可以下载NPM并运行构建。我们有一个nexus安装，我们用于maven构建，所以我也想用它来缓存NPM模块。
我将它放在构建用户主目录中名为.npmrc的文件中：
registry=http://localhost:8081/nexus/content/repositories/npmjs/
grunt构建开始使用自定义注册表，但有时使用官方注册表。有没有办法强制NPM始终使用我的自定义注册表？这是构建输出的片段：
[INFO] npm http GET http://localhost:8081/nexus/content/repositories/npmjs/dateformat/-/dateformat-1.0.2-1.2.3.tgz
[INFO] npm http 200 http://localhost:8081/nexus/content/repositories/npmjs/dateformat/-/dateformat-1.0.2-1.2.3.tgz
[INFO] npm http GET http://localhost:8081/nexus/content/repositories/npmjs/ansi-regex
[INFO] npm http 200 http://localhost:8081/nexus/content/repositories/npmjs/ansi-regex
[INFO] npm http GET http://localhost:8081/nexus/content/repositories/npmjs/wrench
[INFO] npm http 200 http://localhost:8081/nexus/content/repositories/npmjs/wrench
[INFO] npm http GET http://localhost:8081/nexus/content/repositories/npmjs/inherits
[INFO] npm http GET http://localhost:8081/nexus/content/repositories/npmjs/graceful-fs
[INFO] npm http GET https://registry.npmjs.org/semver/-/semver-4.3.6.tgz
[INFO] npm http GET https://registry.npmjs.org/uglify-js/-/uglify-js-2.4.23.tgz
[INFO] npm http GET https://registry.npmjs.org/closure-compiler/-/closure-compiler-0.2.6.tgz
[INFO] npm http GET http://localhost:8081/nexus/content/repositories/npmjs/lodash-compat/3.10.1
[INFO] npm http 200 http://localhost:8081/nexus/content/repositories/npmjs/inherits
[INFO] npm http GET https://registry.npmjs.org/glob/-/glob-5.0.12.tgz
[INFO] npm http 200 http://localhost:8081/nexus/content/repositories/npmjs/graceful-fs
[INFO] npm http 200 http://localhost:8081/nexus/content/repositories/npmjs/lodash-compat/3.10.1