如何让我的Angular web应用程序在移动Chrome中全屏打开？

import { Component, Renderer2 } from '@angular/core';

constructor(private renderer: Renderer2) { }

toggleFullScreen() {
  const doc = window.document;
  const docEl = doc.documentElement;

  const requestFullScreen = docEl.requestFullscreen || docEl.mozRequestFullScreen || docEl.webkitRequestFullScreen || docEl.msRequestFullscreen;
  const exitFullScreen = doc.exitFullscreen || doc.mozCancelFullScreen || doc.webkitExitFullscreen || doc.msExitFullscreen;

  if (!doc.fullscreenElement && !doc.mozFullScreenElement && !doc.webkitFullscreenElement && !doc.msFullscreenElement) {
    // 进入全屏模式
    if (requestFullScreen) {
      requestFullScreen.call(docEl);
    }
  } else {
    // 退出全屏模式
    if (exitFullScreen) {
      exitFullScreen.call(doc);
    }
  }
}

<button (click)="toggleFullScreen()">全屏</button>