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The mount function in Vue3: Mount the Vue3 application to the DOM

王林Original: 2023-06-18 08:45:523324browse

Vue3 is one of the most popular JavaScript frameworks currently, and it plays an irreplaceable role in front-end development. Compared with Vue2, Vue3 has been greatly improved in terms of performance, development experience and code structure. Among them, the mount function is a very important function in Vue3. This article will focus on how to use the mount function to mount the Vue3 application to the DOM.

1. The role of the mount function

In Vue3, you can create a Vue instance through the createApp function, and use the mount function to mount the Vue instance to the DOM. The mount function will bind the template and data in the Vue instance to the DOM, allowing the Vue application to interact with the user. Therefore, it can be said that the mount function is the startup function of the Vue3 application.

2. The syntax of the mount function

The syntax of the mount function is as follows:

app.mount(elementOrSelector: Element | string)

Among them, the elementOrSelector parameter can be a DOM element or selector (string type). If a selector is passed, Vue3 will look for matching elements in the DOM.

3. Use the mount function to mount the Vue3 application to the DOM

In order to better explain how to use the mount function to mount the Vue3 application to the DOM, let's take a simple example below. Introduction as a basis.

First, assume that we have created a Vue instance through the createApp function:

const app = createApp({
  data() {
    return {
      message: 'Hello, Vue3!'
    }
  }
})

Next, we need to mount this Vue instance to the DOM. The specific method is as follows:

// index.html文件
<body>
  <div id="app"></div>
  <script src="./main.js"></script>
</body>

// main.js文件
const app = createApp({
  data() {
    return {
      message: 'Hello, Vue3!'
    }
  }
})

app.mount('#app')

In this example, we create a div element with the id "app" in the index.html file, and then use app.mount('#app') to mount the Vue3 application loaded onto this element.

4. Notes on the mount function

When using the mount function, you need to pay attention to the following points:

Each Vue3 application can only be mounted once. If you need to remount, you must first uninstall the original Vue3 application.
Do not mount Vue3 applications on body or html tags, because this may overwrite other content and events.
After the Vue3 application is started, it will automatically update the DOM elements when mounting, so there is no need to manually manipulate the DOM.

5. Conclusion

This article mainly introduces the mount function in Vue3, and introduces its function, syntax and precautions. After studying this article, I believe you have mastered how to use the mount function to mount a Vue3 application on the DOM. In actual development, the mount function is very important, so everyone should practice more and become proficient in its use.

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