vue 实现loading插件

1、首先创建loading文件夹添加index.js和index.vue

//index.js
import Loading from "./index.vue";

export default {
  // 实现插件必须的install方法
  install(Vue, options) {
    const LoadingConstructor = Vue.extend(Loading);

    let instance = new LoadingConstructor({
      el: document.createElement("div"),
    });
    console.log(instance,options);
    document.body.appendChild(instance.$el)
    if (options) {
      console.log(options);
    }
    const loadingMethods = {
      show(text){
        instance.show = true;
        if (text) {
          instance.text = text
        }
      },
      hide(){
        instance.show = false
      }
    }
    Vue.prototype.$loading = loadingMethods
  },
};

<template>
<!-- index.vue -->
  <div class="loading-content" v-if="show">
    <div class="loading-spinner">
      <svg viewBox="25 25 50 50" class="circular">
        <circle cx="50" cy="50" r="20" fill="none" class="path"></circle>
      </svg>
    </div>
    <div class="loading-text">{{ text }}</div>
  </div>
</template>

<script>
export default {
  name: "loading",
  props: {
    show: Boolean,
    text: {
      type: String,
      default: "加载中。。。",
    },
  },
};
</script>

<style>
.loading-content {
  position: absolute;
  z-index: 2000;
  background-color: rgba(0, 0, 0, 0.8);
  margin: 0;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  transition: opacity 0.3s;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.loading-spinner {
  text-align: center;
}
.loading-spinner .circular {
  height: 42px;
  width: 42px;
  animation: loading-rotate 2s linear infinite;
}
.loading-spinner .path {
  animation: loading-dash 1.5s ease-in-out infinite;
  stroke-dasharray: 90, 150;
  stroke-dashoffset: 0;
  stroke-width: 2;
  stroke: #409eff;
  stroke-linecap: round;
}
.loading-text {
  font-size: 14px;
  color: #409eff;
}
@keyframes loading-rotate {
  100% {
    transform: rotate(360deg);
  }
}
@keyframes loading-dash {
  0% {
    stroke-dasharray: 1, 200;
    stroke-dashoffset: 0;
  }

  50% {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: -40px;
  }

  to {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: -120px;
  }
}
</style>

2、引入到main.js中

import Vue from 'vue'
import App from './App.vue'
import router from './router'
import loading from './components/loading/index'

Vue.config.productionTip = false

Vue.use(loading,{
  size:'small'
})
new Vue({
  router,
  render: h => h(App),
}).$mount('#app')

3、组件中使用

this.$loading.show('拼命加载中。。。')
setTimeout(() => {
  this.$loading.hide()
}, 2000);