vue essays

Examples of components are reusable Vue

data options for a component must be a function

Registered two types of components: global registration and partial registration

Global registration:

Vue.component('component-a', { /* ... */ })
Vue.component('component-b', { /* ... */ })
Vue.component('component-c', { /* ... */ }) new Vue({ el: '#app' })

<div id="app">
  <component-a></component-a> <component-b></component-b> <component-c></component-c> </div>
全局注册往往是不够理想的。比如，如果你使用一个像 webpack 这样的构建系统，全局注册所有的组件意味着即便你已经不再使用一个组件了，它仍然会被包含在你最终的构建结果中。这造成了用户下载的 JavaScript 的无谓的增加。
局部注册：

In these cases, you can define the components through a common JavaScript objects:

var ComponentA = { /* ... */ }
var ComponentB = { /* ... */ }
var ComponentC = { /* ... */ }

Then componentsdefine the components you want to use options:

new Vue({
  el: '#app',
  components: {
    'component-a': ComponentA, 'component-b': ComponentB } })

Note that components in its local register subassembly unusable . For example, if you want ComponentAin ComponentBthe available, then you need to write:

var ComponentA = { /* ... */ }

var ComponentB = {
  components: {
    'component-a': ComponentA }, // ... }

Component name: all lowercase letters and must contain a hyphen (strongly recommended)

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