作用域插槽，用来属性插入
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<link href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.css" rel="stylesheet">
<link href="https://cdn.bootcss.com/animate.css/3.7.1/animate.css" rel="stylesheet">
<style>
</style>
</head>
<body>
<div id="app">
<index>
<p slot-scope="obj">版权所有{{obj.title}}</p>
</index>
</div>
<script>
Vue.component('index',{
template:`
<div>
index
<slot title="这是尾巴"></slot>
</div>
`
})
var vm = new Vue({
el: '#app',
data: {
flag: true
},
});
</script>
</body>
</html>
