混入 (mixins)

是一种分发 Vue 组件中可复用功能的非常灵活的方式。混入对象可以包含任意组件选项。当组件使用混入对象时，所有混入对象的选项将被混入该组件本身的选项。

main.js 

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var base = {
    methods: {
        show: function() {
            this.visible = true
        },
        hide: function() {
            this.visible = false
        },
        hide: function() {
            this.visible = false;  
        },
        toggle: function(){
            this.visible = !this.visible
        },
    },
    data() {
        return {
            visible: false,
        }
    },
}

Vue.component('tooltip', {
    template: `
    <div>
        <span @mouseenter="show" @mouseleave="hide">bys</span>
        <div v-if="visible">
            白岩松
        </div>
    </div>
    `,
    mixins: [base]
})
Vue.component('popup', {
    template: `
    <div>
        <button @click="toggle">Pupup</button>
        <div v-if="visible">
            <span @click="hide">X</span>
            <h4>title</h4>
            Lorem, ipsum dolor sit amet consectetur adipisicing elit. In exercitationem beatae facilis? Cumque nesciunt dolorem odit ipsum obcaecati. Possimus saepe dicta, neque harum mollitia provident nisi voluptatibus corrupti minima quasi.
        </div>
    </div>
    `,
    mixins: [base]
})
new Vue({
    el: '#app',
    data: {
        card1: {
            pinned: false,
        },
        card2: {
            pinned: false,
        }
    },
})

index.js 

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<!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>
    <style>
    [v-cloak] {
        display: none;
    }
    </style>
</head>
<body>
    <div id="app" v-cloak>
        <tooltip></tooltip>
        <popup></popup>
    </div>
    <script src="./lib/vue.js"></script>
    <script src="main.js"></script>
</body>
</html>