lazy loading suspense vue 3 composition api tutorial

sure! lazy loading in vue 3, especially in combination with the composition api and `suspense`, can significantly improve the performance of your application by loading components only when they are needed. this is particularly useful for large applications where you want to optimize the initial load time.

what is lazy loading?

lazy loading is a design pattern that postpones loading resources until they are needed. in vue, you can lazy-load components using dynamic imports, which allows you to split your application into smaller chunks.

what is `suspense`?

`suspense` is a feature in vue 3 that allows you to handle the asynchronous loading of components gracefully. it provides a way to show a loading state while the component is being resolved.

setting up vue 3

before we begin, make sure you have a vue 3 project set up. you can create a new project using vue cli:

```bash
npm install -g @vue/cli
vue create my-vue-app
cd my-vue-app
```

step 1: create a lazy loaded component

```vue
template
div
h2this is a lazy loaded component!/h2
pcurrent time: {{ currenttime }}/p
/div
/template

script setup
import { ref, onmounted } from 'vue';

const currenttime = ref('');

onmounted(() = {
});
/script

style scoped
h2 {
color: blue;
}
/style
```

step 2: create the main component with lazy loading

now, we will create a main component that will use `suspense` and lazily load `lazycomponent`.

```vue
template
div id="app"
h1lazy loading with suspense in vue 3/h1
button @click="showcomponent = true"load lazy component/button

suspense
template default
lazycomponent v-if="showcomponent" /
/template
template fallback
divloading.../div
/template
/s ...

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