点击按钮时添加图像以及更改主题

Question

我是角度世界的新bie现在我已经开发了以下程序来动态加载主题，如下所示

my-scss-file.scss ：

@import '~@angular/material/core/theming/all-theme';

@include md-core();

$primary: md-palette($md-deep-purple);
$accent: md-palette($md-amber);

$theme: md-light-theme($primary, $accent);

@include angular-material-theme($theme);

.dark-theme {
  $dark-p: md-palette($md-deep-purple, 700);
  $dark-a: md-palette($md-amber);

  $dark-t: md-dark-theme($dark-p, $dark-a);

  @include angular-material-theme($dark-t);
}

my-html-file.html ：

<div [class.dark-theme]="isDarkTheme">
<button (click)="toggleTheme()">Toggle theme</button>

my-ts-file.ts ：

@Component({
  selector: 'your-component-selector',
  templateUrl: './my-html-file.html',
  styleUrls: ['my-scss-file.scss']
})
export class YourComponent implements {
  // by default, if you do not want the dark theme
  private isDarkTheme = false;

  constructor() { }

  toggleTheme() {
    this.isDarkTheme = !this.isDarkTheme;
  }
}

现在输出如下所示 output of the above angular app

现在我的查询是，与这些按钮一起，我想添加如下所示的图像，这些图像将与点击按钮一起显示

how the tentative image should be there

所以为此我已经在我的项目中添加了图像文件夹，我现在保留图像请告知我应该在我的.scss文件中添加图片网址以实现此目的

我工作区中的图像文件夹位置 images folder location in my workspace

下面是我的.angular-cli.json文件内容

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "project": {
    "name": "dynamic-material-theming"
  },
  "apps": [
    {
      "root": "src",
      "outDir": "dist",
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "index": "index.html",
      "main": "main.ts",
      "polyfills": "polyfills.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.app.json",
      "testTsconfig": "tsconfig.spec.json",
      "prefix": "app",
      "styles": [
        "styles.css",
        "theme.scss"
      ],
      "scripts": [],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      }
    }
  ],
  "e2e": {
    "protractor": {
      "config": "./protractor.conf.js"
    }
  },
  "lint": [
    {
      "project": "src/tsconfig.app.json"
    },
    {
      "project": "src/tsconfig.spec.json"
    },
    {
      "project": "e2e/tsconfig.e2e.json"
    }
  ],
  "test": {
    "karma": {
      "config": "./karma.conf.js"
    }
  },
  "defaults": {
    "styleExt": "css",
    "component": {}
  }
}