:host/deep/选择器是什么意思? [英] What does :host /deep/ selector mean?

问题描述

请直接说明:host /deep/的含义:

:host /deep/ .ui-autocomplete {
  width: 85%;
}

推荐答案

它用于在使用emulated视图封装时允许对子组件进行样式设置.

It is used to allow styling child components when using emulated view encapsulation.

有关此的更多信息，请参见:

More about this can be found here:

https://angular.io/guide/component-styles

Btw /deep/选择器现已弃用:

Btw /deep/ selector is now deprecated:

不推荐使用穿刺阴影的后代组合器，并且从主要的浏览器和工具中删除了对它的支持.因此，我们计划放弃对Angular的支持(针对/deep/，>>>和:: ng-deep的全部3种).在此之前，应首选:: ng-deep以获得与工具的广泛兼容性.

The shadow-piercing descendant combinator is deprecated and support is being removed from major browsers and tools. As such we plan to drop support in Angular (for all 3 of /deep/, >>> and ::ng-deep). Until then ::ng-deep should be preferred for a broader compatibility with the tools.

:host用于解决托管元素-这是您用于在某处添加组件的元素(例如<app-component>).

:host is used to address the hosting element - that is the one that you use to add the component somewhere (e.g. <app-component>).

使用:host伪类选择器可以在托管组件的元素中定位样式(与在组件模板内定位元素相对).

Use the :host pseudo-class selector to target styles in the element that hosts the component (as opposed to targeting elements inside the component's template).

因此选择器:host /deep/ .ui-autocomplete的意思是在当前宿主元素上，深入了解(也搜索子组件)，并查找类为ui-autocomplete的元素.

So the selector :host /deep/ .ui-autocomplete means "on current hosting element, go deep (search in child components too) and look for elements with class ui-autocomplete.

以下是有关视图封装功能的其他信息:

Here is some additional information about the view encapsulation feature:

https://blog. Thoughtram.io/angular/2015/06/29/shadow-dom-strategies-in-angular2.html

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