通常我们定义的组件添加到页面上，其内容是一致的
<!DOCTYPE html>
<html>
<head>
<title>demo</title>
<style type="text/css">
.panel{
max-width:300px;
border: 1px solid red;
padding:10px;
word-break: break-all;
margin-bottom: 30px;
}
.panel .title{
font-size: 20px;
border-bottom: 1px solid red;
}
.panel .footer{
font-size: 14px;
border-top: 1px solid red;
}
.panel>*{
padding: 30px;
}
</style>
</head>
<body>
<div class="demo">
<panel></panel>
<panel></panel>
<panel></panel>
</div>
<template id="panelTpl">
<div class="demo">
<div class="panel">
<div class="title">Vue</div>
<div class="content">
There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content,There is a part of content.
</div>
<div class="footer">See more tips at https://vuejs.org/guide/deployment.html</div>
</div>
</div>
</template>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script type="text/javascript">
Vue.component('panel',{
template:'#panelTpl',
});
new Vue({
el:'.demo'
});
</script>
</body>
</html>
很多时候，我们希望通过一种方式，让同一个自定义组件，展现出不一样的内容。vue也提供了一个叫插槽的东西slot,
<!DOCTYPE html>
<html>
<head>
<title>demo</title>
<style type="text/css">
.panel{
max-width:300px;
border: 1px solid red;
padding:10px;
word-break: break-all;
margin-bottom: 30px;
}
.panel .title{
font-size: 20px;
border-bottom: 1px solid red;
}
.panel .footer{
font-size: 14px;
border-top: 1px solid red;
}
.panel>*{
padding: 30px;
}
</style>
</head>
<body>
<div class="demo">
<panel>11111</panel>
<panel>22222</panel>
<panel>33333</panel>
</div>
<template id="panelTpl">
<div class="demo">
<div class="panel">
<div class="title">Vue</div>
<div class="content">
<slot></slot>
</div>
<div class="footer">See more tips at https://vuejs.org/guide/deployment.html</div>
</div>
</div>
</template>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script type="text/javascript">
Vue.component('panel',{
template:'#panelTpl',
});
new Vue({
el:'.demo'
});
</script>
</body>
</html>
如上可以通过<slot>标签将组件中间的内容插入到自定义组件模板里面。
但是这里只有一个默认的slot，即模板里面的插入的内容就是自定义的组件标签里面的内容。那如果我还想动态的设置其他部分的内容怎么办呢，
其实vue中，在插入slot的时候，可以指定slot的名字的，表示这个插槽的名字。当组件在使用的时候可以指定那个插槽。
<!DOCTYPE html>
<html>
<head>
<title>demo</title>
<style type="text/css">
.panel{
max-width:300px;
border: 1px solid red;
padding:10px;
word-break: break-all;
margin-bottom: 30px;
}
.panel .title{
font-size: 20px;
border-bottom: 1px solid red;
}
.panel .footer{
font-size: 14px;
border-top: 1px solid red;
}
.panel>*{
padding: 30px;
}
</style>
</head>
<body>
<div class="demo">
<panel>
<div slot="title">
title111111111111111111
</div>
<div slot="content">
content111111111111111111
</div>
<div slot="footer">
footer111111111111111111
</div>
</panel>
<panel>
<div slot="title">
title2222
</div>
<div slot="content">
content22222222
</div>
<!-- <div slot="footer">
footer222
</div> -->
</panel>
</div>
<template id="panelTpl">
<div class="demo">
<div class="panel">
<div class="title">
<slot name="title">不会显示，因为上面有指定内容</slot>
</div>
<div class="content">
<slot name="content"></slot>
<!-- 这里的插槽，如果没有name，直接是对应使用组件时组件中的内容。但如果有了name，表示这里插入的插槽要对应这个name -->
</div>
<div class="footer">
<slot name="footer">没有指定可以显示默认值，写在slot中</slot>
</div>
</div>
</div>
</template>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script type="text/javascript">
Vue.component('panel',{
template:'#panelTpl',
});
new Vue({
el:'.demo'
});
</script>
</body>
</html>
通过这种方式，可以将一个组件套其他组件或者套很多组件。灵活又简洁。
