如果我检查最新的全局npm软件包，则面临问题：
C:\Users\Xin>npm outdated -g
npm ERR! Cannot read property 'length' of undefined
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Xin\AppData\Roaming\npm-cache\_logs\2019-05-16T09_34_44_582Z-debug.log
错误日志如下：
0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli 'C:\\Users\\Xin\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli 'outdated',
1 verbose cli '--global' ]
2 info using npm@6.9.0
3 info using node@v10.15.3
4 verbose npm-session 2407c2fb873b413f
5 http fetch GET 304 https://registry.npmjs.org/audit-ci 721ms (from cache)
6 silly pacote registry packument for audit-ci@1.4.1 fetched in 740ms
7 http fetch GET 304 https://registry.npmjs.org/depcheck 720ms (from cache)
8 silly pacote registry packument for depcheck@0.7.2 fetched in 741ms
9 http fetch GET 304 https://registry.npmjs.org/gulp 723ms (from cache)
10 silly pacote registry packument for gulp@4.0.0 fetched in 744ms
11 http fetch GET 304 https://registry.npmjs.org/npm-check 722ms (from cache)
12 silly pacote registry packument for npm-check@5.9.0 fetched in 746ms
13 http fetch GET 304 https://registry.npmjs.org/node-gyp 734ms (from cache)
14 silly pacote registry packument for node-gyp@4.0.0 fetched in 756ms
15 http fetch GET 304 https://registry.npmjs.org/prettier 733ms (from cache)
16 silly pacote registry packument for prettier@1.16.4 fetched in 759ms
17 http fetch GET 304 https://registry.npmjs.org/yarn 737ms (from cache)
18 silly pacote registry packument for yarn@1.13.0 fetched in 766ms
19 http fetch GET 304 https://registry.npmjs.org/pm2 748ms (from cache)
20 silly pacote registry packument for pm2@3.4.0 fetched in 776ms
21 http fetch GET 304 https://registry.npmjs.org/npm 767ms (from cache)
22 silly pacote registry packument for npm@6.9.0 fetched in 805ms
23 verbose stack TypeError: Cannot read property 'length' of undefined
23 verbose stack at dotindex (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\text-table\index.js:59:32)
23 verbose stack at C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\text-table\index.js:11:21
23 verbose stack at Array.forEach (<anonymous>)
23 verbose stack at forEach (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\text-table\index.js:73:31)
23 verbose stack at C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\text-table\index.js:10:9
23 verbose stack at Array.reduce (<anonymous>)
23 verbose stack at reduce (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\text-table\index.js:63:30)
23 verbose stack at module.exports (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\text-table\index.js:9:20)
23 verbose stack at C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\lib\outdated.js:130:16
23 verbose stack at cb (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\slide\lib\async-map.js:47:24)
23 verbose stack at outdated_ (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\lib\outdated.js:221:12)
23 verbose stack at skip (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\lib\outdated.js:343:5)
23 verbose stack at updateDeps (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\lib\outdated.js:446:7)
23 verbose stack at tryCatcher (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\bluebird\js\release\util.js:16:23)
23 verbose stack at Promise.successAdapter [as _fulfillmentHandler0] (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\bluebird\js\release\nodeify.js:23:30)
23 verbose stack at Promise._settlePromise (C:\Users\Xin\AppData\Roaming\npm\node_modules\npm\node_modules\bluebird\js\release\promise.js:566:21)
24 verbose cwd C:\Users\Xin
25 verbose Windows_NT 10.0.17763
26 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\Xin\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "outdated" "--global"
27 verbose node v10.15.3
28 verbose npm v6.9.0
29 error Cannot read property 'length' of undefined
30 verbose exit [ 1, true ]