安装
假设您已经安装了 Node.js,创建一个目录来保存您的应用程序,并将其设为您的工作目录。
Assuming you've already installed Node.js, create a directory to hold your application, and make that your working directory.
$ mkdir myapp
$ cd myapp
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$ npm init
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entry point: (index.js)
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$ npm install express
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$ npm install express --no-save
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