执行 npm install 会发现很慢，可以在安装时手动指定从哪个镜像服务器获取资源，我使用的是阿里巴巴在国内的镜像服务器。
命令如下：
npm install --registry=https://registry.npm.taobao.org
为避免每次安装都需要--registry参数，可以使用如下命令进行永久设置。
npm config set registry https://registry.npm.taobao.org
执行完命令后，会发现～/.npmrc文件中会加入一条：registry=https://registry.npm.taobao.org
或可以直接编辑 ~/.npmrc 加入下面内容
registry = https://registry.npm.taobao.orgnpm info underscore (如果上面配置正确这个命令会有字符串response)
{ name: \'underscore\', description: \'JavaScript\\'s functional programming helper library.\', \'dist-tags\': { latest: \'1.8.3\', stable: \'1.8.3\' }, maintainers: [ \'jashkenas <jashkenas@gmail.com>\', \'jridgewell <justin+npm@ridgewell.name>\' ], time: { modified: \'2017-03-27T10:13:57.000Z\', created: \'2011-11-14T20:28:47.115Z\', \'1.8.3\': \'2015-04-02T15:32:54.520Z\', \'1.8.2\': \'2015-02-22T14:14:32.785Z\', \'1.8.1\': \'2015-02-20T03:20:05.519Z\', \'1.8.0\': \'2015-02-20T00:14:01.838Z\', \'1.7.0\': \'2014-08-26T22:16:25.836Z\', \'1.6.0\': \'2014-02-10T21:14:55.838Z\', \'1.5.2\': \'2013-09-07T13:00:28.048Z\', \'1.5.1\': \'2013-07-08T08:38:10.051Z\', \'1.5.0\': \'2013-07-06T18:05:58.721Z\', \'1.4.4\': \'2013-01-30T02:12:42.969Z\', \'1.4.3\': \'2012-12-04T18:47:36.401Z\', \'1.4.2\': \'2012-10-07T03:05:02.986Z\', \'1.4.1\': \'2012-10-01T17:20:22.595Z\', \'1.4.0\': \'2012-09-27T22:02:55.267Z\', \'1.3.3\': \'2012-04-10T14:43:48.089Z\', \'1.3.2\': \'2012-04-09T18:38:14.345Z\', \'1.3.1\': \'2012-01-23T22:57:36.474Z\', \'1.3.0\': \'2012-01-11T16:41:38.459Z\', \'1.2.4\': \'2012-01-09T17:23:14.818Z\', \'1.0.4\': \'2011-12-07T15:12:18.045Z\', \'1.2.3\': \'2011-12-07T15:12:18.045Z\', \'1.0.3\': \'2011-12-07T15:12:18.045Z\', \'1.2.1\': \'2011-12-07T15:12:18.045Z\', \'1.2.0\': \'2011-12-07T15:12:18.045Z\', \'1.1.7\': \'2011-12-07T15:12:18.045Z\', \'1.1.0\': \'2011-12-07T15:12:18.045Z\', \'1.1.5\': \'2011-12-07T15:12:18.045Z\', \'1.1.4\': \'2011-12-07T15:12:18.045Z\', \'1.1.3\': \'2011-12-07T15:12:18.045Z\', \'1.1.2\': \'2011-12-07T15:12:18.045Z\', \'1.1.1\': \'2011-12-07T15:12:18.045Z\', \'1.1.6\': \'2011-12-07T15:12:18.045Z\', \'1.2.2\': \'2011-11-14T20:28:47.115Z\' }, users: { mvolkmann: true, lancehunt: true, mikl: true, linus: true, vasc: true, bat: true, dmalam: true, mbrevoort: true, danielr: true, rsimoes: true, tellnes: true, jharding: true, fgribreau: true, tylerstalder: true, pid: true, graemef: true, gillesruppert: true, travishorn: true, m42am: true, bencevans: true, Scryptonite: true, konklone: true, esp: true, bryanburgers: true, ehershey: true, freethenation: true, megadrive: true, dannydulai: true, lupomontero: true, \'cj.nichols\': true, dbrockman: true, maxmaximov: true, hyqhyq_3: true, zonetti: true, cparker15: true, lemulot: true, mlowe: true, chilts: true, shanewholloway: true, elgs: true, eins78: true, awaterma: true, moonpyk: true, raitucarp: true, victorquinn: true, davidgaya: true, netroy: true, \'everywhere.js\': true, tigefa: true, spekkionu: true, pana: true, mhaidarh: true, einfallstoll: true, mpinteractiv: true, simloovoo: true, darosh: true, landau: true, cedrickchee: true, tpwk: true, claveren: true, xtopher: true, gammasoft: true, lomatek: true, \'thomas-so\': true, oliversalzburg: true, nosch: true, rod: true, vegera: true, clintonhalpin: true, seldo: true, priyaranjan: true, cilindrox: true, cheeseen: true, rrobayna: true, rockbot: true, casoetan: true, ajduke: true, protonss: true, mgesmundo: true, bosspj: true, rckbt: true, zeusdeux: true, jetsetty: true, evkline: true, bcoe: true, nbu: true, tehdb: true, obihann: true, wangxian: true, ericlondon: true, lanceball: true, funroll: true, leventkaragol: true, beyoung: true, axelav: true, davidhalldor: true, cwonrails: true, rnbwd: true, cocopas: true, imnicosuarez: true, furkanom: true, andydrew: true, mrmakeit: true, mmierswa: true, jasonw: true, adamk: true, runningtalus: true, sironfoot: true, ezhi: true, suomiton: true, uris77: true, ksnieck: true, fill: true, nithanaroy: true, abalandin: true, jasonweng: true, zenanyoo: true, djbrandl: true, davidrlee: true, dereknelson: true, frk1705: true, nohponex: true, thitinun: true, pilsy: true, lpgray: true, tchey: true, arrc: true, skinnybrit51: true, tmypawa: true, tsangint: true, smashingeric: true, dercoder: true, slahav: true, mhwchung: true, davidrobles: true, moxiaohe: true, truongpv: true, gregoryteach: true, goblindegook: true, tommyjs7: true, adammcarth: true, atd: true, sroccaserra: 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vapeadores: true, dangmin: true }, author: \'Jeremy Ashkenas <jeremy@documentcloud.org>\', repository: { type: \'git\', url: \'git://github.com/jashkenas/underscore.git\' }, versions: [ \'1.0.3\', \'1.0.4\', \'1.1.0\', \'1.1.1\', \'1.1.2\', \'1.1.3\', \'1.1.4\', \'1.1.5\', \'1.1.6\', \'1.1.7\', \'1.2.0\', \'1.2.1\', \'1.2.2\', \'1.2.3\', \'1.2.4\', \'1.3.0\', \'1.3.1\', \'1.3.2\', \'1.3.3\', \'1.4.0\', \'1.4.1\', \'1.4.2\', \'1.4.3\', \'1.4.4\', \'1.5.0\', \'1.5.1\', \'1.5.2\', \'1.6.0\', \'1.7.0\', \'1.8.0\', \'1.8.1\', \'1.8.2\', \'1.8.3\' ], homepage: \'http://underscorejs.org\', bugs: { url: \'https://github.com/jashkenas/underscore/issues\' }, license: \'MIT\', keywords: [ \'util\', \'functional\', \'server\', \'client\', \'browser\' ], main: \'underscore.js\', version: \'1.8.3\', devDependencies: { docco: \'*\', eslint: \'0.6.x\', karma: \'~0.12.31\', \'karma-qunit\': \'~0.1.4\', \'qunit-cli\': \'~0.2.0\', \'uglify-js\': \'2.4.x\' }, scripts: { test: \'npm run test-node && npm run lint\', lint: \'eslint underscore.js test/*.js\', \'test-node\': \'qunit-cli test/*.js\', \'test-browser\': \'npm i karma-phantomjs-launcher && ./node_modules/karma/bin/karma start\', build: \'uglifyjs underscore.js -c "evaluate=false" --comments "/ .*/" -m --source-map underscore-min.map -o underscore-min.js\', doc: \'docco underscore.js\' }, files: [ \'underscore.js\', \'underscore-min.js\', \'underscore-min.map\', \'LICENSE\' ], gitHead: \'e4743ab712b8ab42ad4ccb48b155034d02394e4d\', dist: { shasum: \'4f3fb53b106e6097fcf9cb4109f2a5e9bdfa5022\', size: 34172, noattachment: false, tarball: \'http://registry.npm.taobao.org/underscore/download/underscore-1.8.3.tgz\' }, directories: {}, publish_time: 1427988774520 }