Global functions in Vue3: more convenient global method calls

With the continuous development of front-end technology, Vue, as an advanced front-end framework, is constantly being updated and upgraded. Vue3 is the latest version of Vue. Compared with previous versions, Vue3 has been greatly improved in terms of performance, size, and development experience. One of the important updates is the use of global functions.

In Vue3, the use of global functions has become more convenient. In traditional Vue, developers need to mount global functions to Vue instances through prototypes, which is cumbersome and prone to problems. In Vue3, global functions can be mounted directly through app.config.globalProperties to achieve global calls.

The following is a simple example to illustrate how to mount global functions in Vue3:

import { createApp } from 'vue'

const app = createApp({...})

app.config.globalProperties.$myFunc = function() {
  console.log('This is a global function.')
}

In the above example, we can see that after creating a Vue instance through the createApp method, we Use app.config.globalProperties directly to mount. In this way, we can directly call the $myFunc method in the Vue instance to achieve the effect of global calling.

<template>
  <div>
    <button @click="$myFunc()">Click me</button>
  </div>
</template>

<script>
export default {
  name: 'MyComponent',
  methods: {
    // 此处无需挂载$myFunc方法，即可直接调用
    // 这是因为在app.config.globalProperties中已经进行了挂载
  }
}
</script>

In the above example, we can see that in the Vue component, we can directly call the global function that has been mounted in app.config.globalProperties without mounting the global function. This method can undoubtedly reduce the amount of code for developers and is very convenient.

In addition, Vue3 also provides other global functions, such as provide, watchEffect, etc. These functions can also be mounted through app.config.globalProperties to achieve global calls.

In short, the global function in Vue3 provides a more convenient way to call global methods, which greatly improves development efficiency and development experience. It is worth trying and using by all developers.

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