组件的注册:

先创建一个构造器
var myComponent = Vue.extend({
    template: '...'
})
用Vue.component注册,将构造器用作组件(例为全局组件)
Vue.component('my-component' , myComponent)

注册局部组件:

var Child = Vue.extend({ /* ... */ })

var Parent = Vue.extend({
  template: '...',
  components: {
    // <my-component> 只能用在父组件模板内
    'my-component': Child
  }
})

注册语法糖,简化过程

// 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>'
    }
  }
})

父子组件嵌套的例子:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>index</title>
</head>
<body>
<div id="app">
    <parent></parent>
</div>
<script src="vue.js"></script>
<script>
    var childComponent = Vue.extend({
        template: '<p>this is child template</p>'
    });
    Vue.component("parent",{
        template: '<p>this is parent template</p><child></child><child></child>',
        components: {
            'child': childComponent,
        }
    });
    var app = new Vue({
        el: '#app'
    });
</script>
</body>
</html>

其与以下写法等价:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>index</title>
</head>
<body>
<template id="child">
    <p>this is child template</p>
</template>
<template id="parent">
    <p>this is parent template</p>
    <child></child>
    <child></child>
</template>
<div id="app">
    <parent></parent>
</div>
<script src="vue.js"></script>
<script>
    var childComponent = Vue.extend({
        template: '#child'
    });
    Vue.component("parent",{
        template: '#parent',
        components: {
            'child': childComponent,
        }
    });
    var app = new Vue({
        el: '#app'
    });
</script>
</body>
</html>

页面显示:
效果图

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