Detailed explanation of the role of routing interceptors in vue

In Vue, the route interceptor is mainly used to intercept and process before navigating to a route or when leaving a route. This mechanism allows developers to execute specific logic before or after routing navigation occurs, such as permission verification, data loading, page jumping, etc.

In Vue Router, the router interceptor can be implemented in the following ways:

1. Global Before Guards:

(to, from, next): Register a global pre-guard, which will be called before the route changes when the route navigation is triggered. Purpose: Suitable for global permission verification, page loading progress bar control, etc.

((to, from, next) => {
    // Check user permissions    if (!userAuthenticated) {
        next('/login'); // Unauthenticated jump to login page    } else {
        next(); // If certified, release    }
});

2. Global Resolve Guards:

(to, from, next): Register a global parsing guard, called after the global pre-guard, and before the navigation is confirmed.

((to, from, next) => {
    // Before the navigation is confirmed, perform data loading and other operations    fetchData().then(() => {
        next();
    });
});

3. Per-Route Guard:

Add it directly to the routing configuration objectbeforeEnterField, add guard logic to a single route.

const route = {
    path: '/profile',
    component: Profile,
    beforeEnter: (to, from, next) => {
        // Check whether the user has permission to access the route        if (userHasAccess) {
            next();
        } else {
            next('/403'); // No permission to jump to page 403        }
    }
};

4. In-Component Guards:

Use inside componentsbeforeRouteEnter, beforeRouteUpdate, andbeforeRouteLeaveHook functions, which are called when routed to the current component, when the current component is reused, and when leaving the current component.

export default {
    beforeRouteEnter (to, from, next) {
        // Execute logic before routing navigation enters the component        next(vm => {
            // Can access the instance `vm`        });
    },
    beforeRouteUpdate (to, from, next) {
        // Called when the current route changes, but the component is reused        // Component instances can be accessed `this`        // Usually used to update component data        next();
    },
    beforeRouteLeave (to, from, next) {
        // Called when navigating away from the corresponding route of the component        // Component instances can be accessed `this`        next();
    }
}

The mechanisms of these routing interceptors can help developers control the application's navigation process at different levels and scenarios, and implement functions such as permission control, data preloading, and page jumping, so as to better manage and optimize the interactive experience of front-end applications.

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