ng内容未显示在屏幕上或终端上

Question

您好，我尝试获取“以在屏幕和控制台终端上显示我的文本。我什么也没收到，您什么也听不到。我不明白我在做什么错。

我已经尝试了我在互联网上研究过的所有内容。没用

app.component.html

<bootstrap-panel>
    <div heading>Header</div>
    <div body></div>
</bootstrap-panel>

panel.component.html

<div class="panel panel-default">
    <div class="panel-heading"> 
        <ng-content select="[heading]"></ng-content>
    </div>
    <div class="panel-body"> 
        <div class="body">
         <h2>Body</h2>
         <p>Some Content here.....</p>
        </div>
    </div>
</div>

终端中不显示任何内容。我在app.component.html中看不到我的“ ng-content”，而在那之后我只能看到panel.component.html。

显示的唯一原因是因为我实际上已将其输入到panel.component.html中。

package.json

{
  "name": "hello-world",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~8.0.3",
    "@angular/common": "~8.0.3",
    "@angular/compiler": "~8.0.3",
    "@angular/core": "~8.0.3",
    "@angular/forms": "~8.0.3",
    "@angular/platform-browser": "~8.0.3",
    "@angular/platform-browser-dynamic": "~8.0.3",
    "@angular/router": "~8.0.3",
    "@fortawesome/angular-fontawesome": "^0.4.0",
    "@fortawesome/fontawesome-svg-core": "^1.2.19",
    "@fortawesome/free-regular-svg-icons": "^5.9.0",
    "@fortawesome/free-solid-svg-icons": "^5.9.0",
    "angular-font-awesome": "^3.1.2",
    "bootstrap": "^3.3.7",
    "rxjs": "~6.4.0",
    "tslib": "^1.9.0",
    "zone.js": "~0.9.1"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.800.6",
    "@angular/cli": "~8.0.6",
    "@angular/compiler-cli": "~8.0.3",
    "@angular/language-service": "~8.0.3",
    "@types/node": "~8.9.4",
    "@types/jasmine": "~3.3.8",
    "@types/jasminewd2": "~2.0.3",
    "codelyzer": "^5.0.0",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.15.0",
    "typescript": "~3.4.3"
  }
}

我希望它能在屏幕上显示而不会出现任何问题。有人可以看看这是怎么回事。任何帮助将不胜感激。