Recently, I came into contact with vue3. X project, which has many subtle differences with 2.x. I can’t explain the principle, so I will show it in the simplest form

  • CDN form introduction create:

2.x:

    const app = new Vue({
        el:'#app'
    })
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3.x:

    const app = Vue.createApp({
        
    }).mount('#app')
    / / or:
    const app = Vue.createAPP({
    })
    const vm = mount('#app')
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  • Main.js in @vue/cli

2.x:

    import Vue from 'vue'
    Vue.use()
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3.x:

    import {creatApp} from 'vue'
    import App from 'App.vue'
    createApp(App).use()
    / / or:
    const app = createApp(App)
    app.use()
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