操作方法-全屏-https://www.w3schools.com/howto/howto_js_fullscreen.asp
这就是目前的“棱角方式”。

HTML格式

<h2 (click)="openFullscreen()">open</h2>
<h2 (click)="closeFullscreen()">close</h2>

组件

import { DOCUMENT } from '@angular/common';
import { Component, Inject, OnInit } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit {
  constructor(@Inject(DOCUMENT) private document: any) {}
  elem;

  ngOnInit() {
    this.elem = document.documentElement;
  }

  openFullscreen() {
    if (this.elem.requestFullscreen) {
      this.elem.requestFullscreen();
    } else if (this.elem.mozRequestFullScreen) {
      /* Firefox */
      this.elem.mozRequestFullScreen();
    } else if (this.elem.webkitRequestFullscreen) {
      /* Chrome, Safari and Opera */
      this.elem.webkitRequestFullscreen();
    } else if (this.elem.msRequestFullscreen) {
      /* IE/Edge */
      this.elem.msRequestFullscreen();
    }
  }

  /* Close fullscreen */
  closeFullscreen() {
    if (this.document.exitFullscreen) {
      this.document.exitFullscreen();
    } else if (this.document.mozCancelFullScreen) {
      /* Firefox */
      this.document.mozCancelFullScreen();
    } else if (this.document.webkitExitFullscreen) {
      /* Chrome, Safari and Opera */
      this.document.webkitExitFullscreen();
    } else if (this.document.msExitFullscreen) {
      /* IE/Edge */
      this.document.msExitFullscreen();
    }
  }
}

您可以尝试使用requestFullscreen
我已经在**Stackblitz**上创建了演示

fullScreen() {
    let elem = document.documentElement;
    let methodToBeInvoked = elem.requestFullscreen ||
      elem.webkitRequestFullScreen || elem['mozRequestFullscreen']
      ||
      elem['msRequestFullscreen'];
    if (methodToBeInvoked) methodToBeInvoked.call(elem);
}

上面的大多数答案都是从2018年开始的，现在要在Chrome，Firefox，其他浏览器和移动的上实现兼容性，我已经确定使用requestFullScreen就足够了
https://developer.mozilla.org/en-US/docs/Web/API/Element/requestFullScreen
下面是一个能够在全屏和普通屏幕之间切换的示例：

docElement: HTMLElement;
isFullScreen: boolean = false;

ngOnInit(): void {
    this.docElement = document.documentElement;
}

toggleFullScreen() {
    if (!this.isFullScreen) {
      this.docElement.requestFullscreen();
    }
    else {
      document.exitFullscreen();
    }
    this.isFullScreen = !this.isFullScreen;
}

只有当用户与某个元素（例如按钮）交互时，才能请求更改为全屏

<button (click)="toggleFullScreen()">SWITCH SCREEN MODE</button>

将以下代码放在要触发的组件的顶部（@Component之前）：

interface FsDocument extends HTMLDocument {
      mozFullScreenElement?: Element;
      msFullscreenElement?: Element;
      msExitFullscreen?: () => void;
      mozCancelFullScreen?: () => void;
    }

    export function isFullScreen(): boolean {
      const fsDoc = <FsDocument> document;

      return !!(fsDoc.fullscreenElement || fsDoc.mozFullScreenElement || fsDoc.webkitFullscreenElement || fsDoc.msFullscreenElement);
    }

    interface FsDocumentElement extends HTMLElement {
      msRequestFullscreen?: () => void;
      mozRequestFullScreen?: () => void;
    }

    export function toggleFullScreen(): void {
      const fsDoc = <FsDocument> document;

      if (!isFullScreen()) {
        const fsDocElem = <FsDocumentElement> document.documentElement;

        if (fsDocElem.requestFullscreen)
          fsDocElem.requestFullscreen();
        else if (fsDocElem.msRequestFullscreen)
          fsDocElem.msRequestFullscreen();
        else if (fsDocElem.mozRequestFullScreen)
          fsDocElem.mozRequestFullScreen();
        else if (fsDocElem.webkitRequestFullscreen)
          fsDocElem.webkitRequestFullscreen();
      }
      else if (fsDoc.exitFullscreen)
        fsDoc.exitFullscreen();
      else if (fsDoc.msExitFullscreen)
        fsDoc.msExitFullscreen();
      else if (fsDoc.mozCancelFullScreen)
        fsDoc.mozCancelFullScreen();
      else if (fsDoc.webkitExitFullscreen)
        fsDoc.webkitExitFullscreen();
    }

    export function setFullScreen(full: boolean): void {
      if (full !== isFullScreen())
        toggleFullScreen();
    }

并在ngOnInit方法上调用setFullScreen(full: boolean)函数：

ngOnInit(): void {
    setFullScreen(true);
}

这是当前的“Angular 方式”。

HTML：在Html中使用此：

(click)="openFullscreen()

NgOninit：

this.elem = document.documentElement;

TS：输入此函数，它将工作...

openFullscreen() {
if (this.elem.requestFullscreen) {
  this.elem.requestFullscreen();
} else if (this.elem.mozRequestFullScreen) {
  /* Firefox */
  this.elem.mozRequestFullScreen();
} else if (this.elem.webkitRequestFullscreen) {
  /* Chrome, Safari and Opera */
  this.elem.webkitRequestFullscreen();
} else if (this.elem.msRequestFullscreen) {
  /* IE/Edge */
  this.elem.msRequestFullscreen();
}`]`

}