fix  err   from  jenkins  auto Building

npm ERR! install Couldn't read dependencies
npm ERR! Failed to parse json
npm ERR! Unexpected string
npm ERR! File: /var/lib/jenkins/jobs/BJTU-nodejs/workspace/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