小编gau*_*aus的帖子

我正在创建一个 angular 7 应用程序，并使用有角度的材料侧导航栏。我想在单击侧导航出现和侧导航关闭时将汉堡菜单更改为十字图标，然后将十字图标更改为汉堡菜单图标。

//html code
<mat-sidenav-container class="sidenav-container">
<mat-sidenav #drawer class="sidenav" fixedInViewport="true"
  [attr.role]="'dialog'"
  [mode]="'over'"
  [opened]="!(isHandset$ | async)">
<mat-toolbar>Menu</mat-toolbar>
<mat-nav-list>
  <a mat-list-item href="#">Link 1</a>
  <a mat-list-item href="#">Link 2</a>
  <a mat-list-item href="#">Link 3</a>
</mat-nav-list>
</mat-sidenav>
<mat-sidenav-content>
<mat-toolbar color="primary">
  <button
    type="button"
    aria-label="Toggle sidenav"
    mat-icon-button
    (click)="drawer.toggle()"
    *ngIf="true">
    <mat-icon aria-label="Side nav toggle icon">menu</mat-icon>
  </button>
  <span>web-doctor</span>
</mat-toolbar>

<div style="height: 500px">abc</div>
<ng-content>
</ng-content>

</mat-sidenav-content>
</mat-sidenav-container>

在css文件下面

   //css
   .sidenav-container {
   height: 100%;
   }

  .sidenav {
  width: 200px;
  margin-top: 72px;
  }

 .sidenav .mat-toolbar {
  background: inherit;
  }

 #drawer { …