タグ付けされた質問 「angular-ng-class」

Angularコードの何が問題になっていますか？私は得ています： Cannot read property 'remove' of undefined at BrowserDomAdapter.removeClass ... HTML <ol class="breadcrumb"> <li *ngClass="{active: step==='step1'}" (click)="step='step1; '">Step1</li> <li *ngClass="{active: step==='step2'}" (click)="step='step2'">Step2</li> <li *ngClass="{active: step==='step3'}" (click)="step='step3'">Step3</li> </ol>

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