Let’s talk about why there is a pound sign in the vue address

Using the pound sign (#) in the URL can achieve anchor positioning and page jump, and it also has a special purpose in Vue. So why does the pound sign also appear in the Vue address?

1. The pound sign in Vue routing

Vue is a popular single-page application framework. In order to realize routing switching of single-page applications, Vue introduces Vue-router routing. Vue -router can map URLs to components. When the URL changes, the page will not be reloaded, only the content of the component changes. In Vue-router, the pound sign (#) is used as the separator of the routing path, and the following content represents the routing path, for example:

http://www.example.com/#/home

2. Solve the problem of browser refreshing the page

When using Vue-router, a very common problem is that when users directly enter the routing path in the browser address bar or refresh the page, they will find a 404 error or a blank page. This is because the single-page application has only one HTML file, and the content of the entire application is dynamically rendered, and the refresh of the browser will send the URL to the server. The server cannot recognize the URL and returns a 404 error or a blank page.

The way to solve this problem is to perform URL rewriting on the server side and point all URL requests to the application's entry file (index.html). In this way, when the user enters the routing path or refreshes the page, the server can correctly return the entry file, and Vue-router will parse the URL and display the corresponding components.

However, if the routing path is used directly to complete the jump, there will be a problem that the link is parsed into a request by the browser, and the corresponding resource cannot be found, for example:

<a href="/home">首页</a>

In order to avoid In this case, we can use the URL with a pound sign to implement routing jump:

<router-link to="#/home">首页</router-link>

3. Implement smooth scrolling of the jump page

In single-page applications, it is often necessary to implement page Smooth scrolling between routes, in Vue-router, can be achieved by jumping to the URL with a hash mark and listening for routing changes. For example:

<router-link to="#/home">首页</router-link>

const vueRouter = new VueRouter({
    routes: [
        {
            path: '/home',
            name: 'home',
            component: Home
        }
    ]
});

vueRouter.afterEach(() => {
    window.scrollTo(0, 0);
});

The above code realizes that when jumping to the #home route, the page will smoothly scroll to the top.

Summary

In Vue, the pound sign is one of the elements in Vue routing. It is used to separate and jump routing paths. It can also be used to solve the problem of browser refreshing the page. Problem and achieve smooth scrolling of jump pages. Therefore, in Vue, the pound sign has a special role.

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