定义一个全局加载组件

一、首先定义dom元素

定义一个index.vue文件

<template><div class="loading">loading...</div>
</template>
<script setup lang="ts"></script>
<style scoped>
.loading {display: flex;align-items: center;justify-content: center;font-size: 30px;color: #fff;background: rgba(0, 0, 0, 0.8);height: 100vh;
}
</style>

第二步给dom元素添加，控制显示的开关和方法，然后通过defineExpose暴露出去

<script setup lang="ts">
import { ref } from "vue"
const isShow = ref<boolean>(false);
const show = () => {isShow.value = true
}
const hide = () => {isShow.value = false
}
defineExpose({isShow,show,hide
})
</script>

二、把组件渲染到全局

定义一个index.ts把组件暴露出去

createVNode创建虚拟节点，render把节点渲染到body，然后创建一个全局变量方便操作$Loading

import type { App, VNode } from "vue"
import { createVNode, render } from 'vue'
import loading from './index.vue'
export default {install(app: App) {const Vnode: VNode = createVNode(loading);render(Vnode, document.body)app.config.globalProperties.$Loading = {show: Vnode.component?.exposed?.show,hide: Vnode.component?.exposed?.hide,}}
}

三、注册组件

import { createApp } from 'vue'
import App from './App.vue'
import loading from './components/loading'const app = createApp(App)type Lod = {show():void,hide():void
}declare module 'vue' {export interface ComponentCustomProperties {$Loading: Lod}
}app.use(loading)
app.mount('#app')

使用

<template><div class=""></div>
</template>
<script setup lang="ts">
import { getCurrentInstance } from 'vue';
const app = getCurrentInstance();
app?.proxy?.$Loading.show();
setTimeout(() => {app?.proxy?.$Loading.hide();
}, 2000)
</script>
<style scoped></style>