问题：win10上安装socket.io
D:\learing program\后端练习\node.js\messaging>npm install socket.io --save
npm ERR! Windows_NT 10.0.14393
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "socket.io" "--save"
npm ERR! node v6.9.5
npm ERR! npm v3.10.10
npm ERR! file D:\learing program\后端练习\node.js\messaging\package.json
npm ERR! code EJSONPARSE
npm ERR! Failed to parse json
npm ERR! No data, empty input at 1:1
npm ERR!
npm ERR! ^
npm ERR! File: D:\learing program\后端练习\node.js\messaging\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! D:\learing program\后端练习\node.js\messaging\npm-debug.log
安装命令为npm官网命令npm install socket.io --save
解决方案：
将安装目录改为node.js的安装目录，在node.js目录下安装