2 minor issues encountered by NPM

There are a few recent projects to use with Vux, which need to be installed and built with NPM, with 2 issues logged:

1. npm Install when the Node_modules directory is always empty, the command during the execution of the killed prompt, trial and error search, and finally found that the server's memory is too small to increase the swap partition after normal. Reference resources: https://zhuanlan.zhihu.com/p/33690932

2. npm Run Dev encountered invalid host error, help search found, need to turn off the Webpack_dev_server host check function, reference resources: https://blog.csdn.net/su22du/ article/details/79510072, Note that the file to be modified is build\webpack.dev.conf.js.