RootRendererlink
Injectable service that provides a low-level interface for modifying the UI.
弃用说明
Use RendererFactory2 instead.
说明
Use this service to bypass Angular's templating and make custom UI changes that can't be expressed declaratively. For example if you need to set a property or an attribute whose name is not statically known, use setElementProperty or setElementAttribute respectively.
If you are implementing a custom renderer, you must implement this interface.
The default Renderer implementation is DomRenderer. Also available is WebWorkerRenderer.
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