[Vuejs]-IE11 – failed to open http://localhost:8080

You need to use polyfills. IE11 does not support ES2015, it needs to be transiled by babel. There seem to be various ways of doing this.

Please check this guide: jacklyons.me/how-to-fix-vuejs-not-working-in-ie11

or here: cli.vuejs.org/guide/browser-compatibility.html