加粗1.loading组件样式

<template>
    <transition name="fade">
        <section>
            <div class="loading">
                <!-- <img width="24px" height="24px" src="../images/timg.gif">
                <p class="desc">{{title}}</p> -->
                    <span></span>
                    <span></span>
                    <span></span>
                    <span></span>
                    <span></span>
            </div>
        </section>
    </transition>
</template>
<script>
export default {
  props: {
    title: {
      type: String,
      default: '正在载入...'
    }
  }
}
</script>
<style scoped lang="css">
.fade-enter-active, .fade-leave-active {
  transition: opacity .5s;
}
.fade-enter, .fade-leave-to /* .fade-leave-active below version 2.1.8 */ {
  opacity: 0;
}
section {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,.3);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}
.loading {
    width: 100%;
    text-align: center;
    /* flex-direction: column; */
}
.loading span{
    display: inline-block;
    width: 8px;
    height: 100%;
    border-radius: 4px;
    background: lightgreen;
    -webkit-animation: load 1s ease infinite;
    margin-left: 5px;
}
@-webkit-keyframes load{
    0%,100%{
        height: 40px;
        background: lightgreen;
    }
    50%{
        height: 70px;
        margin: -15px 0;
        background: lightblue;
    }
}
.loading span:nth-child(2){
    -webkit-animation-delay:0.2s;
}
.loading span:nth-child(3){
    -webkit-animation-delay:0.4s;
}
.loading span:nth-child(4){
    -webkit-animation-delay:0.6s;
}
.loading span:nth-child(5){
    -webkit-animation-delay:0.8s;
}
</style>

2.在loading.vue同级下创建一个loading.js

import loading from './loading.vue';

const Loading = {
    install:function(Vue) {
        Vue.component('Loading', loading)
    }
}

export default Loading;

3.在main.js注册

import Vue from 'vue'
import loading from './components/loading'
Vue.use(loading)

4.在组件中使用封装好的loading组件

<loading v-if="hide"></loading>