javascript - How vue-cli extracts public methods and applies them

Question

How to extract the method in the picture and make it into a public part

Answer 1

Write this in methods when instantiating Vue in main.js, and then call $root.link when calling it elsewhere.

var app = new Vue({
    el: '#app',
    router,
    components: {App},
    template: '<App />',
    methods: {
        link: function(to) { ... }
    },
    ...
});

It’s not written in App.vue, thank you @kokradoc for the correction.