What does vue.js plug-in mean?

vue.js plug-in is usually used to add global functions to Vue. The function scope of the plug-in is not strictly limited. To use the plug-in through the global method [Vue.use()], you need to call [new Vue( )】Complete before starting the application.

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Plug-ins are usually used to add globals to Vue Function. There are no strict restrictions on the functional scope of plug-ins - generally there are the following types:

• Add global methods or properties. For example: vue-custom-element

• Add global resources: directives/filters/transitions, etc. For example, vue-touch

• adds some component options through global mixing. For example, vue-router

• adds Vue instance methods by adding them to Vue.prototype.

• A library that provides its own API while providing one or more of the functions mentioned above. For example, vue-router

Use plug-ins

Use plug-ins through the global method Vue.use(). It needs to be completed before you call new Vue() to start the application:

// 调用 `MyPlugin.install(Vue)`
Vue.use(MyPlugin)
new Vue({
  // ...组件选项
})

You can also pass in an optional options object:

Vue.use(MyPlugin, { someOption: true })

Vue.use will automatically prevent multiple registrations of the same plugin. , then the plug-in will only be registered once even if called multiple times.

Some plug-ins officially provided by Vue.js (such as vue-router) will automatically call Vue.use() when detecting that Vue is an accessible global variable. However, in a module environment like CommonJS, you should always call Vue.use() explicitly:

// 用 Browserify 或 webpack 提供的 CommonJS 模块环境时
var Vue = require('vue')
var VueRouter = require('vue-router')
// 不要忘了调用此方法
Vue.use(VueRouter)

awesome-vue has a large collection of community-contributed plugins and libraries.

Develop plug-ins

Vue.js plug-ins should expose an install method. The first parameter of this method is the Vue constructor, and the second parameter is an optional options object:

MyPlugin.install = function (Vue, options) {
  // 1. 添加全局方法或 property
  Vue.myGlobalMethod = function () {
    // 逻辑...
  }
  // 2. 添加全局资源
  Vue.directive('my-directive', {
    bind (el, binding, vnode, oldVnode) {
      // 逻辑...
    }
    ...
  })
  // 3. 注入组件选项
  Vue.mixin({
    created: function () {
      // 逻辑...
    }
    ...
  })
  // 4. 添加实例方法
  Vue.prototype.$myMethod = function (methodOptions) {
    // 逻辑...
  }
}

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