homework/src/app/language-settings/language-settings.page.html

<ion-header>
  <ion-toolbar>
    <ion-back-button slot="start" ></ion-back-button>
    <ion-title>
      语言设置
    </ion-title>
  </ion-toolbar>
</ion-header>

<ion-content>
  <ion-list>
    <ion-item>
      <ion-label>选择语言</ion-label>
      <ion-select [(ngModel)]="selectedLanguage" (ionChange)="changeLanguage()">
        <ion-select-option value="English">English</ion-select-option>
        <ion-select-option value="繁体中文">繁体中文</ion-select-option>
        <ion-select-option value="简体中文">简体中文</ion-select-option>
        <ion-select-option value="日本語">日本語</ion-select-option>
      </ion-select>
    </ion-item>
    <ion-item>
      <ion-label>当前语言设置</ion-label>
      <ion-text>{{ selectedLanguage }}</ion-text>
    </ion-item>
  </ion-list>
</ion-content>