app-schoolnews/src/app/pages/detail/detail.page.html

<ion-header>
  <ion-toolbar color="primary">
    <ion-buttons slot="start">
      <ion-back-button text="" default-href="/"></ion-back-button>
    </ion-buttons>
    <ion-title>新闻详情</ion-title>
  </ion-toolbar>
</ion-header>

<ion-content>
  <div style="line-height: 30px;padding:20px">
    <h2 style="text-align:center">{{title}}</h2>
    {{content}}
  </div>
</ion-content>