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                ## EmbeddedViewRef 表示Angular視圖。 視圖是應用程序UI的基本構建塊。它是元素創建和銷毀的最小組合體。 視圖中元素的屬性可以更改,但視圖中元素的結構(數量和順序)不能更改。更改元素的結構只能通過`ViewContainerRef`插入,移動和刪除嵌套視圖來完成。每個視圖可以包含多個視圖容器。 示例: 例如此模板... ```html Count: {{ items.length }} <ul> <li *ngFor="let item of items">{{ item }}</li> </ul> ``` 這里有兩個`TemplateRef` 外層`TemplateRef` ```html Count: {{ items.length }} <ul> <template ngFor let-item [ngForOf]="items"></template> </ul> ``` 里面的`TemplateRef` ```html <li>{{ item }}</li> ``` 請注意,原始模板分為兩個單獨的TemplateRef。 外部/內部TemplateRefs然后組裝成如下視圖: ```html <!-- ViewRef: outer-0 --> Count: 2 <ul> <template view-container-ref></template> <!-- ViewRef: inner-1 --><li>first</li><!-- /ViewRef: inner-1 --> <!-- ViewRef: inner-2 --><li>second</li><!-- /ViewRef: inner-2 --> </ul> <!-- /ViewRef: outer-0 --> ``` ### 類定義 ```typescript class EmbeddedViewRef { C context : C rootNodes : any[] destroy() : void } ``` ### 屬性 - C - context: `C` - rootNodes : `any[]` - destroy() : `void` 銷毀視圖及其關聯的數據結構。
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