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$ npm install express

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$ npm ls -g

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$ npm uninstall express

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$ npm update express

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$ npm search express

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npm init

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This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See `npm help json` for definitive documentation on these fields
and exactly what they do.

Use `npm install <pkg> --save` afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.
name: (02-npm) npm-module
version: (1.0.0) 1.0.0
description:
entry point: (index.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to /Users/hans/Documents/project/JavaScriptCodes/nodejs-do/02-npm/package.json:

{
  "name": "npm-module",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}


Is this ok? (yes) yes

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$ npm cache clear

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$ npm install -g cnpm --registry=https://registry.npm.taobao.org

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$ cnpm install [name]

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npm config set registry https://registry.npm.taobao.org 
npm info underscore （如果上面配置正确这个命令会有字符串response）

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npm --registry https://registry.npm.taobao.org info underscore

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registry = https://registry.npm.taobao.org

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> x = 7
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> y = 10
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> x + y
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> var yy = _
undefined
> console.log(yy)
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undefined

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> do {
... x++;
... console.log(x);
... }while(x < 20);
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ctrl + c - 退出当前终端。
ctrl + c 按下两次 - 退出 Node REPL。
ctrl + d - 退出 Node REPL.
向上/向下 键 - 查看输入的历史命令
tab 键 - 列出当前命令
.help - 列出使用命令
.break - 退出多行表达式
.clear - 退出多行表达式
.save filename - 保存当前的 Node REPL 会话到指定文件
.load filename - 载入当前 Node REPL 会话的文件内容。