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                            [TOC]

##  defineAsyncComponent- 異步加載組件
```
import { defineAsyncComponent } from 'vue'

// 會為 Foo.vue 及其依賴創建單獨的一個塊
// 它只會按需加載
//（即該異步組件在頁面中被渲染時）
const Foo = defineAsyncComponent(() => import('./Foo.vue'))
```

## v-once 只渲染一次
v-once 只渲染一次, 之后數據在有變更,也不會進行更新顯示,適用于不會變更的組件或塊
如
```
  <div v-once>{{x}}</div>
  <Demo v-once :msg="msg"></Demo>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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