There are four ways to write global functions in Vue.js: through Vue.prototype, global mixing, Plugin, and provide/inject.
Writing global functions in Vue
In Vue.js, we can write global functions in a variety of ways.
1. By Vue.prototype
Vue.prototype is a prototype object of a Vue instance, on which we can add properties and methods to create global functions. For example:
<code class="js">Vue.prototype.myGlobalFunction = function () { // 全局函數(shù)的實(shí)現(xiàn)};</code>
2. Mix through global
Global Mix can be used in all components, we can use it to add global functions. Add in main.js file:
<code class="js">import Vue from 'vue'; import { myGlobalFunction } from './myGlobalFunction'; Vue.mixin({ methods: { myGlobalFunction, }, });</code>
3. Through Plugin
Plugin can add additional features to Vue instances, including global functions. Create a file named myPlugin.js and export it:
<code class="js">export default { install(Vue) { Vue.prototype.$myGlobalFunction = () => { // 全局函數(shù)的實(shí)現(xiàn)}; }, };</code>
Install Plugin in the main.js file:
<code class="js">import myPlugin from './myPlugin'; Vue.use(myPlugin);</code>
4. By providing/inject
provide/inject allows data and methods to be passed between parent and child components. We can use it to provide a global function to all subcomponents:
<code class="js">// 父組件<template> <my-child></my-child> </template> <script> export default { provide() { return { myGlobalFunction, // 全局函數(shù)}; }, }; </script> // 子組件<template> <button></button> </template> <script> export default { inject: ['myGlobalFunction'], }; </script></code>
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