在typescript 8中动态创建样式

html

添加的两个类（imageBorderClassName和customClassName）只是类名，现在我需要向它们添加样式 比如说

宽度：borders.BottomLeftImageWidth+“px”， 高度：borders.TopRightImageHeight+“px”

我该怎么做呢

<div *ngFor="let view of book.selectedPage.views">
   <div [ngClass]="getBorderClasses(view.viewNumber, book.selectedPage.viewBordersLookup)">
   </div>
</div>

public getBorderClasses(viewNumber: number, viewBordersLookup: any) {
        var borders = this.dimensionUtils.getBordersForView(viewNumber, viewBordersLookup);
        return borders.imageBorderClassName + " " + borders.customClassName;
    }