vue2的在这篇文章：

使用Vue.extend来动态创建Toast组件

vue3 动态创建一个 Loading 组件 ：

目录结构

--- components
---｜---Loading
---｜---｜--- index.ts
---｜---｜--- index.vue

......
--- views
---｜---Home.vue

index.vue

<template>
  <div class="loader">
    <div class="loader-inner">
      <div class="loader-line-wrap">
        <div class="loader-line"></div>
      </div>
      <div class="loader-line-wrap">
        <div class="loader-line"></div>
      </div>
      <div class="loader-line-wrap">
        <div class="loader-line"></div>
      </div>
      <div class="loader-line-wrap">
        <div class="loader-line"></div>
      </div>
      <div class="loader-line-wrap">
        <div class="loader-line"></div>
      </div>
    </div>
  </div>
</template>
<script setup lang="ts">
import { ref, defineExpose } from "vue";
const show = ref<boolean>(true);
const msg = "通过instance可以读取到的变量";
//使用了setup语法糖 需要手动暴露
defineExpose({
  show,
  msg,
});
</script>
<style lang="less" scoped>
.loader {
  background: rgba(0, 0, 0, 0.7);
  bottom: 0;
  left: 0;
  overflow: hidden;
  position: fixed;
  right: 0;
  top: 0;
  z-index: 99999;
}

.loader-inner {
  bottom: 0;
  height: 60px;
  left: 0;
  margin: auto;
  position: absolute;
  right: 0;
  top: 0;
  width: 100px;
}

.loader-line-wrap {
  animation: spin 2000ms cubic-bezier(0.175, 0.885, 0.32, 1.275) infinite;
  box-sizing: border-box;
  height: 50px;
  left: 0;
  overflow: hidden;
  position: absolute;
  top: 0;
  transform-origin: 50% 100%;
  width: 100px;
}
.loader-line {
  border: 4px solid transparent;
  border-radius: 100%;
  box-sizing: border-box;
  height: 100px;
  left: 0;
  margin: 0 auto;
  position: absolute;
  right: 0;
  top: 0;
  width: 100px;
}
.loader-line-wrap:nth-child(1) {
  animation-delay: -50ms;
}
.loader-line-wrap:nth-child(2) {
  animation-delay: -100ms;
}
.loader-line-wrap:nth-child(3) {
  animation-delay: -150ms;
}
.loader-line-wrap:nth-child(4) {
  animation-delay: -200ms;
}
.loader-line-wrap:nth-child(5) {
  animation-delay: -250ms;
}

.loader-line-wrap:nth-child(1) .loader-line {
  border-color: hsl(0, 80%, 60%);
  height: 90px;
  width: 90px;
  top: 7px;
}
.loader-line-wrap:nth-child(2) .loader-line {
  border-color: hsl(60, 80%, 60%);
  height: 76px;
  width: 76px;
  top: 14px;
}
.loader-line-wrap:nth-child(3) .loader-line {
  border-color: hsl(120, 80%, 60%);
  height: 62px;
  width: 62px;
  top: 21px;
}
.loader-line-wrap:nth-child(4) .loader-line {
  border-color: hsl(180, 80%, 60%);
  height: 48px;
  width: 48px;
  top: 28px;
}
.loader-line-wrap:nth-child(5) .loader-line {
  border-color: hsl(240, 80%, 60%);
  height: 34px;
  width: 34px;
  top: 35px;
}

@keyframes spin {
  0%,
  15% {
    transform: rotate(0);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>

index.ts

import { Component, createApp } from "vue";
import Loading from "./index.vue";
let instance: any, unmount: () => void;
function mountComponent(RootComponent: Component) {
    const app = createApp(RootComponent);
    const root = document.createElement('div');
    document.body.appendChild(root);
    return {
        instance: app.mount(root),
        unmount() {
            console.log("unmount");
            // app.unmount(root);
            document.body.removeChild(root);
        },
    };
}
// 创建一个loading组件
export function $showLoading() {
    ({ instance, unmount } = mountComponent(Loading));
    console.log(instance);
}
// 销毁loading组件
export function $hiddenLoading() {
    instance && unmount();
}

这样一个Loading组件就创建好了  我们在 Home.vue使用一下

<template>
  <div></div>
</template>
<script setup lang='ts'>
// 引入
import { $showLoading, $hiddenLoading } from "@/components/Loading/index";
// 使用loading组件
$showLoading();
setTimeout(() => {
  // 卸载loading组件
  $hiddenLoading();
}, 3000);
</script>
<style lang='scss' scoped>
 
</style>

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