加载动画

全局加载动画组件示例

加载动画组件代码大致如下

<template>
  <div :class="['xiaobu-loading-mask', show ? 'show' : 'hide']" v-show="show" @scroll.stop>
    <div class="loading-wrapper">
      <span class="loading-dot loading-dot-spin">
        <i></i>
        <i></i>
        <i></i>
        <i></i>
      </span>
    </div>
  </div>
</template>

<script>
export default {
  name: "Loading",
  computed: {
    show() {
      // 使用vuex中的store的 showLoading变量控制
      return this.$store.state.app.showLoading
    }
  }
}
</script>

<style scoped>
  .xiaobu-loading-mask {
    position: fixed;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    user-select: none;
    z-index: 9999;
    overflow: hidden
  }

  .loading-wrapper {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -100%)
  }

  .loading-dot {
    animation: antRotate 1.2s infinite linear;
    transform: rotate(45deg);
    position: relative;
    display: inline-block;
    font-size: 64px;
    width: 37px;
    height: 37px;
    box-sizing: border-box
  }

  .loading-dot i {
    width: 15px;
    height: 15px;
    position: absolute;
    display: block;
    background: #4077F4;
    border-radius: 100%;
    transform: scale(.75);
    transform-origin: 50% 50%;
    opacity: .3;
    animation: antSpinMove 1s infinite linear alternate
  }

  .loading-dot i:nth-child(1) {
    top: 0;
    left: 0
  }

  .loading-dot i:nth-child(2) {
    top: 0;
    right: 0;
    -webkit-animation-delay: .4s;
    animation-delay: .4s
  }

  .loading-dot i:nth-child(3) {
    right: 0;
    bottom: 0;
    -webkit-animation-delay: .8s;
    animation-delay: .8s
  }

  .loading-dot i:nth-child(4) {
    bottom: 0;
    left: 0;
    -webkit-animation-delay: 1.2s;
    animation-delay: 1.2s
  }

  @keyframes antRotate {
    to {
      -webkit-transform: rotate(405deg);
      transform: rotate(405deg)
    }
  }

  @-webkit-keyframes antRotate {
    to {
      -webkit-transform: rotate(405deg);
      transform: rotate(405deg)
    }
  }

  @keyframes antSpinMove {
    to {
      opacity: 1
    }
  }

  @-webkit-keyframes antSpinMove {
    to {
      opacity: 1
    }
  }
</style>

在app.vue中引入

<template>
  <div id="app">
    <!-- 要放在前面，用于后面介绍解决 双加载动画问题 -->
    <loading></loading>
    <router-view class="xiaobu-app-container" />
  </div>
</template>

<script>
import Loading from "@/components/loading"
export default {
  name: "App",
  components: {
    Loading,
  },
}
</script>

<style scoped lang="scss">
#app {
  width: 100%;
  height: 100%;
  .xiaobu-app-container {
    width: 100%;
    height: 100%;
  }
}
</style>

vue2为例 在store/modules/app.js中新增一个状态变量

const state = {
  showLoading: false, //展示全局加载动画
}

const mutations = {
  //设置请求动画状态
  SET_LOADING_STATUS: (state, showLoading) => {
    state.showLoading = showLoading
  },
}

const actions = {}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}

这样处理完后配合配置中的showLoadingFun和hideLoadingFun方法即可实现精准控制全局加载动画。

精准控制请求动画原理

优化包有一个变量用于存储当前正在请求的接口数量，当正在请求的接口数量大于0时，触发showLoadingFun方法，当正在请求的接口数量等于0时，触发hideLoadingFun方法。