Vue加载中（Windows开机动画）

（模仿Windows开机动画）效果如下图：

支持自定义设置：

• 描述文案（tip），也可不传，默认不展示
• 是否无限次循环动画（infinite），默认false
• 完成一次动画后的间隔时长（interval），单位ms，默认200ms

①创建Loading.vue组件：

<template>
  <div class="m-spin">
    <div :class="['m-spin-dot', tip ? 'mt60':'mt30']">
      <span :class="['u-dot-item', { infinite: infinite, disposable: !infinite&&running }]"></span>
      <span :class="['u-dot-item', { infinite: infinite, disposable: !infinite&&running }]"></span>
      <span :class="['u-dot-item', { infinite: infinite, disposable: !infinite&&running }]"></span>
      <span :class="['u-dot-item', { infinite: infinite, disposable: !infinite&&running }]"></span>
      <!-- 监听最后一个dot动画完成 -->
      <span :class="['u-dot-item', { infinite: infinite, disposable: !infinite&&running }]" @animationend="callback"></span>
    </div>
    <p class="u-tip">{
  { tip }}</p>
  </div>
</template>
<script>
export default {
  name: 'Loading',
  props: {
    tip: { // 描述文案
      type: String,
      default: ''
    },
    infinite: { // 是否无限次循环动画
      type: Boolean,
      default: false
    },
    interval: { // 完成一次动画后的间隔时长，单位ms
      type: Number,
      default: 200
    }
  },
  data () {
    return {
      running: true // 动画运行标识，infinite为false时生效
    }
  },
  methods: {
    callback () {
      this.running = false
      setTimeout(() => {
        this.running = true
      }, this.interval)
    }
  }
}
</script>
<style lang="less" scoped>
.m-spin {
  position: relative;
  width: 100%;
  height: 100%;
}
.u-tip {
  position: absolute;
  top: 50%;
  font-size: 16px;
  line-height: 20px;
  color: #FFF;
  width: 100%;
  text-align: center;
  padding-top: 16px;
}
.m-spin-dot {
  position: absolute;
  display: inline-block;
  width: 60px;
  height: 60px;
  top: 50%;
  left: 0;
  right: 0;
  margin: 0 auto;
  .u-dot-item { // 单个圆点样式
    position: absolute;
    width: 10px;
    height: 10px;
    top: 0;
    left: 0;
    right: 0;
    margin: 0 auto;
    background: #FFF;
    border-radius: 50%;
    transform-origin: 50% 30px; // 50%为自身高度的一半
  }
  .u-dot-item:nth-child(2) {
    animation-delay: .2s;
    -webkit-animation-delay: .2s;
  }
  .u-dot-item:nth-child(3) {
    animation-delay: .4s;
    -webkit-animation-delay: .4s;
  }
  .u-dot-item:nth-child(4) {
    animation-delay: .6s;
    -webkit-animation-delay: .6s;
  }
  .u-dot-item:last-child {
    animation-delay: .8s;
    -webkit-animation-delay: .8s;
  }
  .infinite { // 无限次
    animation: spinMove 2s ease-in-out infinite;
    -webkit-animation: spinMove 2s ease-in-out infinite;
  }
  .disposable { // 一次性
    animation: spinMove 2s ease-in-out;
    -webkit-animation: spinMove 2s ease-in-out;
  }
  @keyframes spinMove {
    to { transform: rotate(360deg); } // from: 0%  to: 100%
  }
}
.mt60 {
  margin-top: -60px;
}
.mt30 {
  margin-top: -30px;
}
</style>

②在要使用的页面引用：

<div class="m-area" >
    <Loading :tip="tip" :infinite="true" :interval="200" v-show="loading" />
</div>
import Loading from '@/components/Loading'
components: {
    Loading
},
data () {
    return {
        tip: '加载中...',
        loading: false
    }
}
.m-area {
    margin: 0 auto;
    width: 500px;
    height: 400px;
    border: 1px solid #1890ff;
    background: #000;
}