1: In the Google search app store directly: Vue.js devtools installation
2: CDN development environment, do not use the production environment CDN
<-! Production version, optimized for size and speed -> < Script src = "https://cdn.jsdelivr.net/npm/vue"> </ Script>
<-! Development environment version includes a helpful warning command line -> < Script src = "https://cdn.jsdelivr.net/npm/vue/dist/vue.js"> </ Script>
3: F12 handover can see vue-pannel
4: More detailed information: https://segmentfault.com/a/1190000009682735