XiaoQiang:imooc XieTongXue$ bower install bootstrap/usr/local/lib/node_modules/bower/lib/node_modules/configstore/index.js:54 throw err; ^Error: EACCES: permission denied, open '/Users/XieTongXue/.config/configstore/bower-github.json'You don't have access to this file.? ? at Error (native)? ? at Object.fs.openSync (fs.js:640:18)? ? at Object.fs.readFileSync (fs.js:508:33)? ? at Object.create.all.get (/usr/local/lib/node_modules/bower/lib/node_modules/configstore/index.js:35:26)? ? at Object.Configstore (/usr/local/lib/node_modules/bower/lib/node_modules/configstore/index.js:28:44)? ? at readCachedConfig (/usr/local/lib/node_modules/bower/lib/config.js:19:23)? ? at defaultConfig (/usr/local/lib/node_modules/bower/lib/config.js:11:12)? ? at Object.<anonymous> (/usr/local/lib/node_modules/bower/lib/index.js:16:32)? ? at Module._compile (module.js:541:32)? ? at Object.Module._extensions..js (module.js:550:10)