Is there a complete tutorial, or should I write it directly under vue-cli?
Similar to element-ui or iview.
I already know how to write a single vue plug-in. How to integrate and package multiple plug-ins together?

// toast.js

var Toast = {}; Toast.install = function (Vue, options) { Vue.prototype.$msg = 'Hello World'; } module.exports = Toast;

How to combine multiple plug-ins like this together?