[Vuejs]-How to include/import custom js files into vue project?

There are a few routes you can take here. The easiest by far would be to find the files on NPM and install them in your project, use Webpack or Gulp, to copy the files over to the public JS path that is used in Index.js. Another way is to find those files online and copy them by hand (copy whole file contents, paste to new local file) and save to the template core files public path you wish.