date: 2017-12-03 10:40:49
tags:

背景

上篇介绍了如何封装一个react全局组件，这篇介绍下vue如何封装一个全局组件。

思路

通过Vue.extend(options)，使用基础 Vue 构造器，创建一个子类，再创建这个子类的实例，挂载到body元素上。具体看代码注释。

代码

index.js

import Vue from 'vue';
import Loading from './loading';
// 创建一个“子类”
let LoadingC = Vue.extend(Loading);
let instance;
export default {
    open (options = {}) {
        if (!instance) {
            this.initInstance(options);
        }
        instance.visible = true;
    },
    initInstance (options) {
        // 创建子类实例
        instance = new LoadingC({
            el: document.createElement('div')
        });
        // 传入属性
        instance.text = options.text || '加载中';
        for (var prop in options) {
            if (options.hasOwnProperty(prop)) {
                instance[prop] = options[prop];
            }
        }
        // 插到body里
        document.body.appendChild(instance.$el);
        Vue.nextTick(() => {
            instance.visible = true;
        });
    },
    close () {
        instance.visible = false;
    }
};

loading.vue

<template>
    <div class="loading" v-show="visible">
        <div class="loading-mask">
            <div class="loading-outter">
                <div class="loading-wrap">
                    <div class="loading-ring"></div>
                </div>
                <div class="loading-rect"></div>
                <div class="loading-text">{{ text }}</div>
            </div>
        </div>
    </div>
</template>
<script>
export default {
    props: {
        text: {
            type: String,
            default: ''
        }
    },
    data () {
        return {
            visible: true
        };
    },
    created () {

    }
};
</script>
<style lang="scss" scoped>
    .loading{
        transition: opacity .3s linear;
        width: 100%;
        height: 100%;
        position: fixed;
        display: block;
        text-align: center;
        top: 0;
        background-color: transparent;//背景透明
        z-index: 9999;
        &:after{
            content: "";
            display: inline-block;
        }
    }
    .loading-mask{
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, .2);
    }
.loading-outter {
    position: relative;
    top: 50%;
    margin-top: -0.35rem;
    display: inline-block;
    vertical-align: middle;
    background-color: #222;
    border-radius: .5rem;
    height: .75rem;
}
.loading-wrap {
    position: absolute;
    width: .56rem;
    height: .56rem;
    top: .094rem;
    left: .09rem
}
.loading-ring {
    width: .56rem;
    height: .56rem;
    background-image: url("../../../assets/images/loading.svg");
    background-size: cover;
    position: absolute;
}
.loading-rect {
    height: .18rem;
    width: .18rem;
    background-color: #FD404A;
    border-radius: .05rem;
    -webkit-transform: rotate3D(0, 0, 1, 45deg);
    position: absolute;
    left: .28rem;
    top: .28rem;
}

.loading-text {
    text-align: left;
    color: #fff;
    font-size: .24rem;
    font-family: sans-serif;
    line-height: .75rem;
    padding-left: .85rem;
    padding-right: .26rem;
}

.loading-enter,
.loading-leave-active {
    opacity: 0;
}
</style>