解决方案在stackoverflow上找到的，关掉strict-ssl即可，如下：

npm config set strict-ssl false
npm install -g express
$npm -g express-generator
express -e d:/blog
SET DEBUG=d:/blog:* & npm start
npm install -g core-js
npm start
cnpm config set strict-ssl false
用完之后恢复：

npm config set strict-ssl true
cnpm config set strict-ssl true