如何在 npm 安装时解决此问题：(npm ERR！ 安装无法读取依赖项)？

Question

你好，我在安装npm时遇到问题：我尝试删除并重新安装，但没有成功，甚至删除了所有文件夹。

> lucas@lucas:~$ npm install
> npm ERR! install Couldn't read dependencies
> npm ERR! Linux 4.2.0-35-generic
> npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install"
> npm ERR! node v4.4.2
> npm ERR! npm  v2.15.0
> npm ERR! file /home/lucas/package.json
> npm ERR! code EJSONPARSE
> npm ERR! Failed to parse json
> npm ERR! Unexpected token ':' at 1:17
> npm ERR!   "dependencies": {
> npm ERR!                 ^
> npm ERR! File: /home/lucas/package.json
> npm ERR! Failed to parse package.json data.
> npm ERR! package.json must be actual JSON, not just JavaScript.
> npm ERR! 
> npm ERR! This is not a bug in npm.
> npm ERR! Tell the package author to fix their package.json file. JSON.parse
> npm ERR! Please include the following file with any support request:
> npm ERR!     /home/lucas/npm-debug.log

Answer 1

NPM告诉你发生了什么：

> npm ERR! File: /home/lucas/package.json
> npm ERR! Failed to parse package.json data.
> npm ERR! package.json must be actual JSON, not just JavaScript.
> npm ERR! 
> npm ERR! This is not a bug in npm.
> npm ERR! Tell the package author to fix their package.json file. JSON.parse

请确保您的JSON文件有效。您可以在JSONLint上查看。以下是依赖项部分的外观。请注意周围的对象括号。

{ "dependencies" :
  { "foo" : "1.0.0 - 2.9999.9999"
  , "bar" : ">=1.0.2 <2.1.2"
  , "baz" : ">1.0.2 <=2.3.4"
  , "boo" : "2.0.1"
  , "qux" : "<1.0.0 || >=2.3.1 <2.4.5 || >=2.5.2 <3.0.0"
  , "asd" : "http://asdf.com/asdf.tar.gz"
  , "til" : "~1.2"
  , "elf" : "~1.2.3"
  , "two" : "2.x"
  , "thr" : "3.3.x"
  , "lat" : "latest"
  , "dyl" : "file:../dyl"
  }
}

请参阅这篇关于NPM文档中"依赖项"部分的文章，并确保您的package.json部分看起来相似，尤其是"依赖性"之前的任何字符。