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This article is about how to analyze Vue router routing guards. I think it is very practical, so I share it with you. I hope you can get something after reading this article. Let's take a look at it.

1. Global pre-beforeEach

When the name stored in Local Storage is zhangsan, click on the message to display the message content.

1. Global front beforeEach

Add a routing guard beforeEach to router

Syntax:

Router.beforeEach ((to, from, next) = > {})

Function: call the functions in beforeEach during initialization and before each route switch

Parameters:

1.to: destination rout

2.from: routing before hopping

3.next: release

two。 Realize

II. Demand II

If there are many paths that need to be judged before jumping, you need to write a lot of judgment code, and the judgment structure will be very complex.

At this time, you can put a meta tag in the route that needs to be judged.

Meta tags provide metadata about HTML documents (metadata refers to data used to describe data)

At this point, you can use the tag field in meta to judge.

Third, the global guard afterEach

AfterEach and beforeEach are used in the same way.

The difference is that afterEach does not have the parameter next.

1. Change title to your own title

Assign each route its own title name

Const router = new VueRouter ({routes: [{name: 'home', path:' / home', component: Home, meta: {title: "Home"}, children: [{name: "xiaoxi", path: 'message', component: Message Meta: {title: "message"}, children: [{name: 'xiangqing', path:' detail', component: Detail, meta: {isAuth: true Title: "message details"}]}]}, {path:'/ about', component: About, meta: {title: "about"}}]})

Modify the title name in beforEach

Router.afterEach ((to, from) = > {document.title = to.meta.title | | "Test"}) IV. BeforeRouteEnter in the component

Through routing rules, it is called when entering the component

2. BeforeRouteLeave

Through routing rules, it is called when leaving the component

The above is how to analyze the Vue router routing guard, the editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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