var MyComponent = Vue.extend({
 // 选项...后面再介绍
}) 

<div id="example">
 <my-component></my-component>
</div> 

// 定义
var MyComponent = Vue.extend({
 template: '<div>A custom component!</div>'
})

// 注册
Vue.component('my-component', MyComponent)

// 创建根实例
new Vue({
 el: '#example'
})

 <div id="example">
 <div>A custom component!</div>
</div 

var child = Vue.extend({
 template: '<div>A custom component!</div>'
});
var parent = Vue.extend({

 template: '<div>Parent Component: <child-component></child-component></div>',
 components: {
 'child-component': child
 }
});
Vue.component("parent-component", parent);

// 在一个步骤中扩展与注册
Vue.component('my-component', {
template: '<div>A custom component!</div>'
})

// 局部注册也可以这么做
var Parent = Vue.extend({
 components: {
 'my-component': {
  template: '<div>A custom component!</div>'
 }
 }
})

<div id="dynamic">
 <button id="home">Home</button>
 <button id="posts">Posts</button>
 <button id="archive">Archive</button>
 <br>
 <component :is="currentView"></component>
</div>

var vue = new Vue({
 el:"#dynamic",
 data: {
 currentView: "home"
 },
 components: {
 home:{
  template: "Home"
 },
 posts: {
  template: "Posts"
 },
 archive: {
  template: "Archive"
 }
 }
});
document.getElementById("home").onclick = function(){
vue.currentView = "home";
};
document.getElementById("posts").onclick = function(){
vue.currentView = "posts";
};
document.getElementById("archive").onclick = function(){
vue.currentView = "archive";
};

var data = { a: 1 };
var vm = new Vue({
data: data
});
// `vm.a` 和 `data.a` 现在是响应的
vm.b = 2
// `vm.b` 不是响应的
data.b = 2
// `data.b` 不是响应的

var vm = new Vue({
 template: '<div>{{msg}}</div>'
})
// 然后添加 `msg`
vm.$set('msg', 'Hello!')

var vm = new Vue({
 data: {
 // 以一个空值声明 `msg`
 msg: ''
 },
 template: '<div>{{msg}}</div>'
})
// 然后设置 `msg`
vm.msg = 'Hello!'

<!-- 实现script定义一个模板 -->
<script type="x/template" id="modal-template">
 <!--模板是否显示通过v-show="show"来设置， transition设置动画效果-->
 <div class="modal-mask" v-show="show" transition="modal">
 <div class="modal-wrapper">
  <div class="modal-container">
  <div class="modal-header">
   <!--slot 相当于header占位符-->
   <slot name="header">
   default header
   </slot>
  </div>
  <div class="modal-body">
   <!--slot 相当于body占位符-->
   <slot name="body">
   default body
   </slot>
  </div>
  <div class="modal-footer">
   <!--slot 相当于footer占位符-->
   <slot name="footer">
   default footer
   </slot>
   <button class="modal-default-button" @click="show = false">OK</button>
  </div>
  </div>
 </div>
 </div>
</script>
<div id="app">
 <!--点击按钮时设置vue实例特性showModal的值为true-->
 <button id="show-modal" @click="showModal = true">show modal</button>
 <!--modal是自定义的一个插件，插件的特性show绑定vue实例的showModal特性-->
 <modal :show.sync="showModal">
 <!--替换modal插件中slot那么为header的内容-->
 <h3 slot="header">Custom Header</h3>
 </modal>
</div>

//定义一个插件，名称为modal
Vue.component("modal", {
 //插件的模板绑定id为modal-template的DOM元素内容
 template: "#modal-template",
 props: {
 //特性，类型为布尔
 show:{
  type: Boolean,
  required: true,
  twoWay: true
 }
 }
});
//实例化vue，作用域在id为app元素下，
new Vue({
 el: "#app",
 data: {
 //特性，默认值为false
 showModal: false
 }
});

.modal-mask {
 position: fixed;
 z-index: 9998;
 top: 0;
 left: 0;
 width: 100%;
 height: 100%;
 background-color: rgba(0, 0, 0, .5);
 display: table;
 transition: opacity .3s ease;
}

.modal-wrapper {
 display: table-cell;
 vertical-align: middle;
}

.modal-container {
 width: 300px;
 margin: 0px auto;
 padding: 20px 30px;
 background-color: #fff;
 border-radius: 2px;
 box-shadow: 0 2px 8px rgba(0, 0, 0, .33);
 transition: all .3s ease;
 font-family: Helvetica, Arial, sans-serif;
}

.modal-header h3 {
 margin-top: 0;
 color: #42b983;
}

.modal-body {
 margin: 20px 0;
}

.modal-default-button {
 float: right;
}

/*
* the following styles are auto-applied to elements with
* v-transition="modal" when their visiblity is toggled
* by Vue.js.
*
* You can easily play with the modal transition by editing
* these styles.
*/

.modal-enter, .modal-leave {
 opacity: 0;
}

.modal-enter .modal-container,
.modal-leave .modal-container {
 -webkit-transform: scale(1.1);
 transform: scale(1.1);
}