Detailed explanation of the global function in Vue3: achieving more convenient global method calls

Detailed explanation of the global function in Vue3: achieving more convenient global method calls

In Vue3, a new global function is added, its function is to register a function or object into the global content of the application , allowing us to use these methods or objects directly in any component. This greatly simplifies our development process and makes calling global methods more convenient.

The following is a detailed explanation of the global function in Vue3:

1. Register the method to the global

We can register the method to the application by using the global function in the global content of the program. If we have a greet method, we can register it globally so that it can be called directly in any component.

import { createApp } from 'vue'

const app = createApp({})

app.config.globalProperties.$greet = () => console.log('Hello World!')

app.mount('#app')

In this code, we use the createApp function to create a Vue instance, and then use the globalProperties attribute to register the $greet method globally. We can call this method directly in any component:

export default {
  mounted() {
    this.$greet()
  }
}

2. Register the object to the global

Similar to the registration method, we can also use the global function to register an object to the big picture. If we have an object named $config, we can register it globally:

import { createApp } from 'vue'

const app = createApp({})

const config = {
  apiUrl: 'https://api.example.com'
}

app.config.globalProperties.$config = config

app.mount('#app')

So that we can use the $config object directly in any component:

export default {
  methods: {
    fetchData() {
      const apiUrl = this.$config.apiUrl
      // call API with apiUrl
    }
  }
}

3. Add global methods or objects to the plug-in

When we create a Vue plug-in, we can use the plug-in's install method to register some methods or objects. In Vue3, we can also use global functions to register these methods or objects, making the use of plug-ins more convenient.

For example, suppose we have a plug-in named MyPlugin, which provides a greet method:

const MyPlugin = {
  install(Vue) {
    Vue.prototype.$greet = () => console.log('Hello World!')
  }
}

export default MyPlugin

If we use this plug-in in Vue2, we need to install the plug-in manually to the big picture. But in Vue3, we can use the global function to handle this problem:

import { createApp } from 'vue'

import MyPlugin from './my-plugin'

const app = createApp({})

app.use(MyPlugin)
app.mount('#app')

So we can directly call the $greet method in any component:

export default {
  mounted() {
    this.$greet()
  }
}

In Vue3, the global function The emergence of makes calling global methods more convenient. We can register commonly used methods or objects globally, so that we can use them directly in any component, which greatly simplifies the development process.

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