npm install的時(shí)候 ，確實(shí)是很慢蕴纳，而且打印一堆消息会油，很多時(shí)候不知道包安裝的是否有問題。
后面的nodejs+express實(shí)戰(zhàn)中 yarn 準(zhǔn)備用起來(lái)古毛。
yarn init = npm init
yarn = yarn install = npm install
yarn add somePackage = npm install somePackage
yarn upgrade somePackage = npm update somePackage
yarn remove somePackage = npm uninstall somePackage
