报错如下（这个报错不是我场景中的报错）：
Installing GitBook 3.2.3
/home/travis/.nvm/versions/node/v12.18.3/lib/node_modules/gitbook-cli/node_modules/npm/node_modules/graceful-fs/polyfills.js:287
if (cb) cb.apply(this, arguments)
^
TypeError: cb.apply is not a function
at /home/travis/.nvm/versions/node/v12.18.3/lib/node_modules/gitbook-cli/node_modules/npm/node_modules/graceful-fs/polyfills.js:287:18
at FSReqCallback.oncomplete (fs.js:169:5)
The command "gitbook install" failed and exited with 1 during .
我采用的方案：
cd /usr/lib/node_modules/gitbook-cli
npm i graceful-fs@4.1.4 --save
cd /usr/lib/node_modules/gitbook-cli/node_modules/npm
npm i graceful-fs@4.1.4 --save
我觉得node.js是我一生之敌，各种各样的问题太多了！！！