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並前往https://stackoverflow.com/questions/45816271/add-class-to-an-element-in-angular-4

Add class to an element in Angular 4 - Stack Overflow

Use [ngClass] and conditionally apply class based on the id . In your HTML file: <li> <img [ngClass]="{'this-is-a-class': id === 1 }" id="1" ...

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