vue entry file

A, index.html

Two, main.js

　　Entry file, load the common component

new view ({ 
  el: '#app' , 
  router, 
  store, 
  render: h => h (app) 
})

　　el: Mount goals

　　router: Routing

　　render: component name

Three, App.vue

　　render the introduction App.vue

Calling sequence 1.index.html 2.main.js 3.App.vue