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a hello world package
npm 发布包 1>编写模块 bin用于存放二进制文件的目录 lib用于存放javascript代码的目录 doc用于存放文档的目录 test用于存放单元测试用例的目录 2>初始化package.json包描述文件 3>注册包仓库帐号//第一次注册，后面直接使用即可 npm adduser 4>上传包 npm publish 5>命令行移动到合适的目录，安装上传的包即可
-->注意我在上传包之后安装的过程中犯了一个错误，在这个my_module目录底下安装这个hello_test_tangerwei这个包，npm会自动抛出错误 Refusing to install hello_test_tangerwei as a dependency of itself 意思是：拒绝在将hello_test_tangerwei安装在他本身的目录下，因为my_module就是hello_test_tangerwei
